Nortel-MsCarrier-MscPassport-BridgeMIB: View SNMP OID List / Download MIB

This entry controls the addition and deletion of mscVrPpTbcl components.

A single entry in the table represents a single mscVrPpTbcl component.

This variable is used as the basis for SNMP naming of mscVrPpTbcl components. These components can be added and deleted.

This variable provides the component's string name for use with the ASCII Console Interface

This variable represents the storage type value for the mscVrPpTbcl tables.

This variable represents the index for the mscVrPpTbcl tables.

This entry controls the addition and deletion of mscVrPpTbclNs components.

A single entry in the table represents a single mscVrPpTbclNs component.

This variable is used as the basis for SNMP naming of mscVrPpTbclNs components. These components can be added and deleted.

This variable provides the component's string name for use with the ASCII Console Interface

This variable represents the storage type value for the mscVrPpTbclNs tables.

This variable represents the index for the mscVrPpTbclNs tables.

This group houses all the port specific provisionable attributes associated with Ns. These attributes influence the application of filters to incoming and outgoing frames.

An entry in the mscVrPpTbclNsProvTable.

This attribute specifies the name of the filter to be applied at the incoming filter point.

This attribute specifies the name of the filter to be applied at the out going filter point.

This group houses all the provisionable attributes that belong to the this group. This group of attributes is applicable to all types of bridge ports and represent the common factor between them. These attributes influence the working of a bridge port.

An entry in the mscVrPpTbclProvTable.

This attribute specifies the type of translation to be performed on frames carrying IPX packets. Ethernet frames carrying IPX payload could be translated to IEEE 802.3 frames (with the same IPX payload) or vice- versa. The main reason to do so is to allow the bridge unit to consistently forward one type of frames carrying IPX packets. Translations can be turned off altogether in which case the IPX frames will pass through the bridge unit unchanged. Enumeration: 'snap': 3, 'ethernet': 2, 'sap': 4, 'off': 0, 'ieee8023': 1.

This attribute specifies if or not outbound frames carrying IP datagrams should be fragmented to conform to message transfer unit (mtu) sizes dictated by the media. Enumeration: 'on': 1, 'off': 0.

This attribute specifies if the frames should be ordered or not before they are transmitted through a bridge port. If this attribute has a value of ordered the received frames are ordered as in the original message, before they are transmitted out through a bridge port. If it has a value of notOrdered, received then frames pass through the bridge unit in the order they are received. This feature can be used over multiple telecommunication links to increase data flow. Please note that this attribute only affects link protocols and is ineffective with lan media. Enumeration: 'notOrdered': 1, 'ordered': 0.

This attribute is indicative of the state of the MAC address format conversion process for ARP/RARP frames. The MAC addresses may be translated if need be from a canonical format to a non-canonical format, based on the needs of the associated media. If this attribute is set to a value of on then all Mac addresses will converted if need be to suit the format of mac address, the outgoing media will support. If this attribute is set to a value of off no such conversion takes place. Enumeration: 'on': 1, 'off': 0.

This attribute is indicative of the unique number assigned to the bridge port. It is used for SNMP management of this bridge port and in spanning tree as an identifier this bridge port. Notes regarding portNum: Escape routines exist for initializing, copying, and deleting port numbers. This is necessary because SNMP requires a unique port instance identifier. The initPortNum escape routine sets the port number to a value in the range 1-255 for this purpose. The setCopiedPortNum escape routine exists to maintain the uniqueness of the port number in cases when one port is copied to another. When a bridge port is deleted, the releasePortNum escape routine places the port number being released into a pending deletion state. This is because the port number cannot be re-allocated until the port is truely deleted in the current view. This is necessary since there is no guarantee of order when processing changes to multiple protocol ports so without the pending deletion state, the same port number could be temporarily assigned to two ports for a short period of time. The portNum is set as component critical since bridging also uses the port number as a key for indexing into its data structures. If a port is deleted then re-added under the same protocol port, CAS treats the change as a SET to the portNum attribute.

This group houses all the port specific provisionable attributes that belong to the Tb group. The Tb group is only applicable bridge port types that operate in the TB mode. These attributes in part influence the working of a bridge port operating in the TB mode.

An entry in the mscVrPpTbclTbProvTable.

This attribute specifies whether the port secure feature is enabled. The secure feature, if enabled causes the following things to happen: a) disallows dynamic learning, b) disallows frames to be forwarded that do not satisfy the following condition: the mac address of the source should be found in the forwarding table and the destination mac address of the frame should also be found in the forwarding table. In addition to this, the port the frame was received on should figure as the in port, given the destination mac address found in the frame. c) disallows frames to be forwarded if the allowed to go port map for the destination mac address is empty. This feature in effect allows the user to choose the hosts that can generate traffic and the hosts that can receive traffic through this bridge unit. Enumeration: 'disabled': 0, 'enabled': 1.

This group houses all the port specific provisionable attributes that belong to the Stp group. The Stp group is applicable to all the bridge ports that participate in the spanning tree protocol. These attributes influence the participation of the bridge port in the spanning tree protocol.

An entry in the mscVrPpTbclStpProvTable.

This attribute defines the current administrative state for this component. enabled indicates that the component is available for operation. disabled indicates the component is unavailable for operation. Enumeration: 'down': 2, 'up': 1.

This attribute specifies whether or not spanning tree protocol state for this bridge port is controlled by the spanning tree protocol. In essence it indicates the participation of this bridge port in the spanning tree protocol, by accepting and acting on received bridge protocol data units and by sending out the same. on signifies that this bridge port's spanning tree port state is controlled by the spanning tree protocol. A value of off signifies that the spanning tree port state of this bridge port is unaffected by the spanning tree protocol. This in effect puts the bridge port out of reach of the spanning tree protocol and in the forwarding state. Care should be taken while assigning a value of off to this attribute, as this might cause network loops. Please do not set this attribute to off unless you are absolutely sure about the effect of such an action on your network topology. Enumeration: 'on': 1, 'off': 0.

This attribute specifies the type of spanning tree protocol the port is participating in. A bridge port could participate in either the ieee8021 spanning tree protocol or the dec spanning tree protocol. If the value of the attribute protocolSpec in the SpanningTreeProtocol component, provisioned under the TransparentBridge component is in conflict with the value of this attribute, the value of the protocolSpec attribute will prevail. Prevailing stp type is reflected in the value of the attribute stpTypeOper. Enumeration: 'dec': 2, 'ieee8021': 3.

This attribute specifies the value for port priority, which is contained in the first octet of the port identifier. Valid values are as follows: 1) 0..255 for stp type DEC and 2) 0..65535 for stp type IEEE.

This attribute specifies the contribution of this port, to all the paths to the root bridge that include this port. Please note that the value of the attribute pathCostMethod is applied only when the value of the attribute pathCostMethod is set to on and is ignored if otherwise.

This attribute specifies the method used by the bridging logic, to calculate the path cost to the bridge considered to be the root bridge in the spanning tree topology. This attribute should be set to off before attempting to provision a value for pathCostProv. Enumeration: 'dec': 2, 'off': 1, 'ieee8021': 3.

This group houses all the provisionable, domain specific attributes for a non-encapsulating bridge port.

An entry in the mscVrPpTbclDIProvTable.

This attribute specifies the domain number associated with this bridge port. Domain numbers are used for confining frames to a domain. Domain based filtering provides a complete segregation of traffic based on domain number associated with frames. There can exist only sixteen domains when a spanning tree is desired specific to each domain. When there is only a single spanning tree spanning all the domains the maximum number of domains possible are 4294967293. This attribute is of no relevance when associated with backbone bridge port. Its value is ignored in such a situation.

This attribute specifies if the domain information should be preserved or embedded in the frame header. This attribute applies only to backbone ports and does not affect the access bridge ports. By setting this attribute to a value of on, domain information could be preserved in frames being tunnelled across the a backbone, so that this information can be deciphered at the other end of the backbone tunnel. This preserves the integrity of the domains thus preventing domain breaches while tunnelling frames across backbone network. If the value of this attribute is set to off then domain information is not preserved in the header of the frames tunnelling through the backbone. This eliminates the overhead incurred to preserve domain information across the backbone while tunnelling frames across it. Preserve domain is relevant when used in conjunction with the following media: FDDI, ATM MPE, Frame Relay and PPP. It is ignored when used with other types of media. Enumeration: 'on': 1, 'off': 0.

This group contains the three OSI State attributes. The descriptions generically indicate what each state attribute implies about the component. Note that not all the values and state combinations described here are supported by every component which uses this group. For component-specific information and the valid state combinations, refer to NTP 241-7001-150, Passport Operations and Maintenance Guide.

An entry in the mscVrPpTbclStateTable.

This attribute indicates the OSI Administrative State of the component. The value locked indicates that the component is administratively prohibited from providing services for its users. A Lock or Lock - force command has been previously issued for this component. When the value is locked, the value of usageState must be idle. The value shuttingDown indicates that the component is administratively permitted to provide service to its existing users only. A Lock command was issued against the component and it is in the process of shutting down. The value unlocked indicates that the component is administratively permitted to provide services for its users. To enter this state, issue an Unlock command to this component. Enumeration: 'locked': 0, 'shuttingDown': 2, 'unlocked': 1.

This attribute indicates the OSI Operational State of the component. The value enabled indicates that the component is available for operation. Note that if adminState is locked, it would still not be providing service. The value disabled indicates that the component is not available for operation. For example, something is wrong with the component itself, or with another component on which this one depends. If the value is disabled, the usageState must be idle. Enumeration: 'disabled': 0, 'enabled': 1.

This attribute indicates the OSI Usage State of the component. The value idle indicates that the component is not currently in use. The value active indicates that the component is in use and has spare capacity to provide for additional users. The value busy indicates that the component is in use and has no spare operating capacity for additional users at this time. Enumeration: 'active': 1, 'idle': 0, 'busy': 2.

This group includes the Operational Status attribute. This attribute defines the current operational state of this component.

An entry in the mscVrPpTbclOperStatusTable.

The current state of the interface. The up state indicates the interface is operational and capable of forwarding packets. The down state indicates the interface is not operational, thus unable to forward packets. testing state indicates that no operational packets can be passed. Enumeration: 'down': 2, 'testing': 3, 'up': 1.

This group houses all the operational attributes belonging to the base group. The base group of attributes is applicable to all types of bridge ports and represent the common factor between them. These attributes in part, reflect the state of a bridge port.

An entry in the mscVrPpTbclOperTable.

The attribute portName is a string of the form 'BridgePortName-i', where BridgePortName is the abbreviation of the corresponding bridge port and i is the instance identifier of the ProtocolPort, the bridge port is provisioned under. For example a TransparentBridgePort provisioned under ProtocolPort/myport would have a name TBP-myport.

This attribute specifies the accumulated up time of this bridge port since the last reset occurred.

This attribute specifies the accumulated down time of this bridge port since the last reset occurred.

This attribute specifies the mode of bridging this port can support. It in turn implies the format of frames, this bridge port can process and forward. Enumeration: 'unknown': 1, 'tb': 2, 'srt': 4, 'sr': 3.

This attribute specifies the bridge port's configuration. It indicates if the bridge port is operating as an access port or as a backbone port. An access bridge port does not encapsulate a MAC frame and does not preserve domain information in the encapsulation, whereas a backbone bridge port encapsulates the MAC frame and optionally preserves domain information in the encapsulated frame.A backbone bridge port is typically used to transport frames across a high bandwidth backbone network to another bridge unit for further processing/forwarding of the frame. Enumeration: 'access': 1, 'backbone': 2.

This attribute specifies the type of bridge port that was provisioned. It takes into consideration the bridgingMode, bridgePortConfig and the media the bridge port is linked to before branding a bridge port. Enumeration: 'fddiBridgePort': 2, 'ethernetBridgePort': 0, 'snaDlrBridgePort': 21, 'clusterTbBridgePort': 18, 'lanEmulationClientEthernet': 22, 'frameRelayBridgePort': 6, 'srtbBridgePort': 15, 'srEncapSrBridgePort': 11, 'tbsrBridgePort': 16, 'unknown': 19, 'vcpBridgePort': 9, 'clusterSrBridgePort': 17, 'srEncapTbBridgePort': 12, 'fddiEncapsulatingBridgePort': 4, 'sourceGateSrBridgePort': 13, 'sourceGateTbBridgePort': 14, 'x25BridgePort': 10, 'smdsBridgePort': 8, 'tokenRingBridgePort': 1, 'tokenBusBridgePort': 3, 'vnsBridgePort': 5, 'atmMpeBridgePort': 20, 'pppBridgePort': 7.

This attribute specifies the index into the Interface Table where in information about the media interface corresponding to the bridge port is maintained.

This attribute is indicative of the number of frames that were discarded because the time taken to process these frames exceeded the transit delay allowed for this bridge unit. This attribute is not supported by bridging and will always have a value of 0.

This attribute is indicative of the number of frames discarded because the size of the out bound frame exceeded the message transfer unit (mtu) allowed for the bridge port. Note that this counter only refers to the outbound frames for this bridge port. This counter wraps around its maximum value of 4294967295. This counter is influenced by the attribute fragmentIp. This counter is incremented when the a frame larger than the mtu allowed is encountered and cannot be fragmented. If this counter is increasing steadily, it might be useful to set the value of the attribute fragmentIp to a value of on.

This group houses all the port specific operational attributes that belong to the Tb group. This group also houses all the port specific statistical attributes that belong to the Tb group. The Tb group is only applicable bridge port types that operate in the TB mode. These attributes reflect the state of a bridge port operating in the TB mode

An entry in the mscVrPpTbclTbOperTable.

This attribute specifies the maximum size of the information field in a TB frame. This excludes the header field.

This attribute is indicative of the number of incoming frames that were discarded because: a) the value of the secureOption attribute was set to on and b) it is not allowed to receive frames originating from the mac address found in the source address field of the frame (source mac address look up in the forwarding table failed.) on this bridge port. c) for the destination mac address found in the frame, the port the frame was received on does not appear as in port in the corresponding static table entry. Permission to receive frames from a mac address is granted via the static table entries. This attribute, badVerifyDiscards, is directly influenced by: 1. secureOption and 2. the static table entries. This counter wraps around its maximum value of 4294967295.

This attribute is indicative of the number frames discarded because the MAC address found in the destination field did not match the local MAC address of the bridge port. This counter is only applicable for the protocols that are being routed currently.This counter wraps around its maximum value of 4294967295.

This attribute is indicative of the number of frames that were discarded because of the following two reasons: a) there was no entry for the 'allowed to go' field in the static table entry, where the input port is this bridge port. b) for spanning tree bpdus that are locally processed. This counter wraps around its maximum value of 4294967295. It might prove useful to check the static table entry corresponding to the bridge port in question, if this counter consistently displays a high value. Ideally this counter should be as low as possible.

This attribute is indicative of the number of incoming frames that a) were discarded because of the fact that the bridge port, the frame is to go out of matches the bridge port it came in from or b) if the stp port state of the out port is not forwarding. This counter wraps around its maximum value of 4294967295.

This attribute is indicative of the number of frames that were discarded while this bridge port was in a state other than the forwarding state. While in learning state the frame is discarded after the information from its header is learnt. This counter wraps around its maximum value of 4294967295.

This attribute is indicative of the number of frames that were received by this bridge port and were discarded by the forwarding process. This includes frames that could have been discarded due to filtering. A repidly increasing value for this attribute could indicate a shrtage of resource in terms of memory needed to process the incoming frames. More memory can be provisioned through the VirtualRouter's memory manager.

This attribute is indicative of the number of frames that have been received by this port from its segment. Note that a frame received on this bridge port is counted if and only if it can be processed by the bridge logic contained in this bridge unit, a protocol that can be processed by the bridge logic. This counter wraps around its maximum value of 4294967295.

This attribute is indicative of the number of frames that have been transmitted out this bridge port. Note that frame transmitted out this bridge port is counted if and only if it is for a protocol being processed by the bridge unit. This also includes management frames.This counter wraps around its maximum value of 4294967295.

This group houses all the port specific operational attributes that belong to the Stp group. The Stp group is applicable to all the bridge ports that participate in the spanning tree protocol. These attributes reflect the state of the bridge port's participation in the spanning tree protocol.

An entry in the mscVrPpTbclStpOperTable.

This attribute specifies the spanning tree protocol state of the bridge port. Enumeration: 'listening': 3, 'disabled': 1, 'broken': 6, 'learning': 4, 'forwarding': 5, 'blocking': 2.

This attribute specifies the type of spanning tree protocol the port is participating in. A bridge port could participate in either the ieee8021 spanning tree protocol or the dec spanning tree protocol. Enumeration: 'none': 0, 'dec': 2, 'ieee8021': 3.

This attribute specifies the path cost of the designated port of the lan segment connected to the port.

This attribute specifies the contribution of this port, to all the paths to the root bridge that include this port. This attribute pathCostOper will track the value of the attribute pathCostProv when the value of the attribute pathCostMethod is set of off.

This attribute specifies the identifier of the bridge that this port considers to be the designated bridge.

This attribute specifies the port identifier of the port on the designated bridge, attached to the same lan as this port is attached to.

This attribute is indicative of the number of times this bridge port transitioned from the learning state to the forwarding state. This counter wraps around its maximum value of 4294967295. A rapidly increasing value might be indicative of an unstable spanning tree topology.

This attribute is indicative of the number of incoming frames that were discarded because the bridge port was in the blocking state. This counter wraps around its maximum value of 4294967295.

This attribute specifies the bridge identifier of the bridge recorded as the root bridge, in the configuration BPDUs sent out by the designated bridge on the segment to which the port is attached.

This group houses all the statistical attributes applicable to all types of bridge ports and represents the common factor between them. These attributes in part reflect the state of the bridge port.

An entry in the mscVrPpTbclStatsTable.

This attribute is indicative of the number of frames that were discarded because the data that was abstracted, from frames coming in through this bridge port, did not conform to the format expected by the bridge logic.This counter wraps around its maximum value of 4294967295.

This attribute is indicative of the number of frames received on this bridge port that used the tinygram compression scheme.

This attribute is indicative of the number of frames transmitted out this bridge port that used the tinygram compression scheme.

This attribute is indicative of the number of frames discarded at the in filter point. This includes a) frames discarded due to application of the filter defined with PCF for the in filter point and b) the frames discarded due to domain based filtering at the in filter point. This counter wraps around its maximum value of 4294967295.

This attribute is indicative of the number of frames discarded at the out filter point. This includes: a) frames discarded due to application of the filter defined with PCF for the out filter point and b) the frames discarded due to domain based filtering at the out filter point. This counter wraps around its maximum value of 4294967295.

This entry controls the addition and deletion of mscVrPpFddiETB components.

A single entry in the table represents a single mscVrPpFddiETB component.

This variable is used as the basis for SNMP naming of mscVrPpFddiETB components. These components can be added and deleted.

This variable provides the component's string name for use with the ASCII Console Interface

This variable represents the storage type value for the mscVrPpFddiETB tables.

This variable represents the index for the mscVrPpFddiETB tables.

This entry controls the addition and deletion of mscVrPpFddiETBNs components.

A single entry in the table represents a single mscVrPpFddiETBNs component.

This variable is used as the basis for SNMP naming of mscVrPpFddiETBNs components. These components can be added and deleted.

This variable provides the component's string name for use with the ASCII Console Interface

This variable represents the storage type value for the mscVrPpFddiETBNs tables.

This variable represents the index for the mscVrPpFddiETBNs tables.

This group houses all the port specific provisionable attributes associated with Ns. These attributes influence the application of filters to incoming and outgoing frames.

An entry in the mscVrPpFddiETBNsProvTable.

This attribute specifies the name of the filter to be applied at the incoming filter point.

This attribute specifies the name of the filter to be applied at the out going filter point.

This group houses all the provisionable attributes that belong to the this group. This group of attributes is applicable to all types of bridge ports and represent the common factor between them. These attributes influence the working of a bridge port.

An entry in the mscVrPpFddiETBProvTable.

This attribute specifies the type of translation to be performed on frames carrying IPX packets. Ethernet frames carrying IPX payload could be translated to IEEE 802.3 frames (with the same IPX payload) or vice- versa. The main reason to do so is to allow the bridge unit to consistently forward one type of frames carrying IPX packets. Translations can be turned off altogether in which case the IPX frames will pass through the bridge unit unchanged. Enumeration: 'snap': 3, 'ethernet': 2, 'sap': 4, 'off': 0, 'ieee8023': 1.

This attribute specifies if or not outbound frames carrying IP datagrams should be fragmented to conform to message transfer unit (mtu) sizes dictated by the media. Enumeration: 'on': 1, 'off': 0.

This attribute specifies if the frames should be ordered or not before they are transmitted through a bridge port. If this attribute has a value of ordered the received frames are ordered as in the original message, before they are transmitted out through a bridge port. If it has a value of notOrdered, received then frames pass through the bridge unit in the order they are received. This feature can be used over multiple telecommunication links to increase data flow. Please note that this attribute only affects link protocols and is ineffective with lan media. Enumeration: 'notOrdered': 1, 'ordered': 0.

This attribute is indicative of the state of the MAC address format conversion process for ARP/RARP frames. The MAC addresses may be translated if need be from a canonical format to a non-canonical format, based on the needs of the associated media. If this attribute is set to a value of on then all Mac addresses will converted if need be to suit the format of mac address, the outgoing media will support. If this attribute is set to a value of off no such conversion takes place. Enumeration: 'on': 1, 'off': 0.

This attribute is indicative of the unique number assigned to the bridge port. It is used for SNMP management of this bridge port and in spanning tree as an identifier this bridge port. Notes regarding portNum: Escape routines exist for initializing, copying, and deleting port numbers. This is necessary because SNMP requires a unique port instance identifier. The initPortNum escape routine sets the port number to a value in the range 1-255 for this purpose. The setCopiedPortNum escape routine exists to maintain the uniqueness of the port number in cases when one port is copied to another. When a bridge port is deleted, the releasePortNum escape routine places the port number being released into a pending deletion state. This is because the port number cannot be re-allocated until the port is truely deleted in the current view. This is necessary since there is no guarantee of order when processing changes to multiple protocol ports so without the pending deletion state, the same port number could be temporarily assigned to two ports for a short period of time. The portNum is set as component critical since bridging also uses the port number as a key for indexing into its data structures. If a port is deleted then re-added under the same protocol port, CAS treats the change as a SET to the portNum attribute.

This group houses all the port specific provisionable attributes that belong to the Tb group. The Tb group is only applicable bridge port types that operate in the TB mode. These attributes in part influence the working of a bridge port operating in the TB mode.

An entry in the mscVrPpFddiETBTbProvTable.

This attribute specifies whether the port secure feature is enabled. The secure feature, if enabled causes the following things to happen: a) disallows dynamic learning, b) disallows frames to be forwarded that do not satisfy the following condition: the mac address of the source should be found in the forwarding table and the destination mac address of the frame should also be found in the forwarding table. In addition to this, the port the frame was received on should figure as the in port, given the destination mac address found in the frame. c) disallows frames to be forwarded if the allowed to go port map for the destination mac address is empty. This feature in effect allows the user to choose the hosts that can generate traffic and the hosts that can receive traffic through this bridge unit. Enumeration: 'disabled': 0, 'enabled': 1.

This group houses all the port specific provisionable attributes that belong to the Stp group. The Stp group is applicable to all the bridge ports that participate in the spanning tree protocol. These attributes influence the participation of the bridge port in the spanning tree protocol.

An entry in the mscVrPpFddiETBStpProvTable.

This attribute defines the current administrative state for this component. enabled indicates that the component is available for operation. disabled indicates the component is unavailable for operation. Enumeration: 'down': 2, 'up': 1.

This attribute specifies whether or not spanning tree protocol state for this bridge port is controlled by the spanning tree protocol. In essence it indicates the participation of this bridge port in the spanning tree protocol, by accepting and acting on received bridge protocol data units and by sending out the same. on signifies that this bridge port's spanning tree port state is controlled by the spanning tree protocol. A value of off signifies that the spanning tree port state of this bridge port is unaffected by the spanning tree protocol. This in effect puts the bridge port out of reach of the spanning tree protocol and in the forwarding state. Care should be taken while assigning a value of off to this attribute, as this might cause network loops. Please do not set this attribute to off unless you are absolutely sure about the effect of such an action on your network topology. Enumeration: 'on': 1, 'off': 0.

This attribute specifies the type of spanning tree protocol the port is participating in. A bridge port could participate in either the ieee8021 spanning tree protocol or the dec spanning tree protocol. If the value of the attribute protocolSpec in the SpanningTreeProtocol component, provisioned under the TransparentBridge component is in conflict with the value of this attribute, the value of the protocolSpec attribute will prevail. Prevailing stp type is reflected in the value of the attribute stpTypeOper. Enumeration: 'dec': 2, 'ieee8021': 3.

This attribute specifies the value for port priority, which is contained in the first octet of the port identifier. Valid values are as follows: 1) 0..255 for stp type DEC and 2) 0..65535 for stp type IEEE.

This attribute specifies the contribution of this port, to all the paths to the root bridge that include this port. Please note that the value of the attribute pathCostMethod is applied only when the value of the attribute pathCostMethod is set to on and is ignored if otherwise.

This attribute specifies the method used by the bridging logic, to calculate the path cost to the bridge considered to be the root bridge in the spanning tree topology. This attribute should be set to off before attempting to provision a value for pathCostProv. Enumeration: 'dec': 2, 'off': 1, 'ieee8021': 3.

This group houses all the provisionable, domain specific attributes for a non-encapsulating bridge port.

An entry in the mscVrPpFddiETBDIProvTable.

This attribute specifies the domain number associated with this bridge port. Domain numbers are used for confining frames to a domain. Domain based filtering provides a complete segregation of traffic based on domain number associated with frames. There can exist only sixteen domains when a spanning tree is desired specific to each domain. When there is only a single spanning tree spanning all the domains the maximum number of domains possible are 4294967293. This attribute is of no relevance when associated with backbone bridge port. Its value is ignored in such a situation.

This attribute specifies if the domain information should be preserved or embedded in the frame header. This attribute applies only to backbone ports and does not affect the access bridge ports. By setting this attribute to a value of on, domain information could be preserved in frames being tunnelled across the a backbone, so that this information can be deciphered at the other end of the backbone tunnel. This preserves the integrity of the domains thus preventing domain breaches while tunnelling frames across backbone network. If the value of this attribute is set to off then domain information is not preserved in the header of the frames tunnelling through the backbone. This eliminates the overhead incurred to preserve domain information across the backbone while tunnelling frames across it. Preserve domain is relevant when used in conjunction with the following media: FDDI, ATM MPE, Frame Relay and PPP. It is ignored when used with other types of media. Enumeration: 'on': 1, 'off': 0.

This group contains the three OSI State attributes. The descriptions generically indicate what each state attribute implies about the component. Note that not all the values and state combinations described here are supported by every component which uses this group. For component-specific information and the valid state combinations, refer to NTP 241-7001-150, Passport Operations and Maintenance Guide.

An entry in the mscVrPpFddiETBStateTable.

This attribute indicates the OSI Administrative State of the component. The value locked indicates that the component is administratively prohibited from providing services for its users. A Lock or Lock - force command has been previously issued for this component. When the value is locked, the value of usageState must be idle. The value shuttingDown indicates that the component is administratively permitted to provide service to its existing users only. A Lock command was issued against the component and it is in the process of shutting down. The value unlocked indicates that the component is administratively permitted to provide services for its users. To enter this state, issue an Unlock command to this component. Enumeration: 'locked': 0, 'shuttingDown': 2, 'unlocked': 1.

This attribute indicates the OSI Operational State of the component. The value enabled indicates that the component is available for operation. Note that if adminState is locked, it would still not be providing service. The value disabled indicates that the component is not available for operation. For example, something is wrong with the component itself, or with another component on which this one depends. If the value is disabled, the usageState must be idle. Enumeration: 'disabled': 0, 'enabled': 1.

This attribute indicates the OSI Usage State of the component. The value idle indicates that the component is not currently in use. The value active indicates that the component is in use and has spare capacity to provide for additional users. The value busy indicates that the component is in use and has no spare operating capacity for additional users at this time. Enumeration: 'active': 1, 'idle': 0, 'busy': 2.

This group includes the Operational Status attribute. This attribute defines the current operational state of this component.

An entry in the mscVrPpFddiETBOperStatusTable.

The current state of the interface. The up state indicates the interface is operational and capable of forwarding packets. The down state indicates the interface is not operational, thus unable to forward packets. testing state indicates that no operational packets can be passed. Enumeration: 'down': 2, 'testing': 3, 'up': 1.

This group houses all the operational attributes belonging to the base group. The base group of attributes is applicable to all types of bridge ports and represent the common factor between them. These attributes in part, reflect the state of a bridge port.

An entry in the mscVrPpFddiETBOperTable.

The attribute portName is a string of the form 'BridgePortName-i', where BridgePortName is the abbreviation of the corresponding bridge port and i is the instance identifier of the ProtocolPort, the bridge port is provisioned under. For example a TransparentBridgePort provisioned under ProtocolPort/myport would have a name TBP-myport.

This attribute specifies the accumulated up time of this bridge port since the last reset occurred.

This attribute specifies the accumulated down time of this bridge port since the last reset occurred.

This attribute specifies the mode of bridging this port can support. It in turn implies the format of frames, this bridge port can process and forward. Enumeration: 'unknown': 1, 'tb': 2, 'srt': 4, 'sr': 3.

This attribute specifies the bridge port's configuration. It indicates if the bridge port is operating as an access port or as a backbone port. An access bridge port does not encapsulate a MAC frame and does not preserve domain information in the encapsulation, whereas a backbone bridge port encapsulates the MAC frame and optionally preserves domain information in the encapsulated frame.A backbone bridge port is typically used to transport frames across a high bandwidth backbone network to another bridge unit for further processing/forwarding of the frame. Enumeration: 'access': 1, 'backbone': 2.

This attribute specifies the type of bridge port that was provisioned. It takes into consideration the bridgingMode, bridgePortConfig and the media the bridge port is linked to before branding a bridge port. Enumeration: 'fddiBridgePort': 2, 'ethernetBridgePort': 0, 'snaDlrBridgePort': 21, 'clusterTbBridgePort': 18, 'lanEmulationClientEthernet': 22, 'frameRelayBridgePort': 6, 'srtbBridgePort': 15, 'srEncapSrBridgePort': 11, 'tbsrBridgePort': 16, 'unknown': 19, 'vcpBridgePort': 9, 'clusterSrBridgePort': 17, 'srEncapTbBridgePort': 12, 'fddiEncapsulatingBridgePort': 4, 'sourceGateSrBridgePort': 13, 'sourceGateTbBridgePort': 14, 'x25BridgePort': 10, 'smdsBridgePort': 8, 'tokenRingBridgePort': 1, 'tokenBusBridgePort': 3, 'vnsBridgePort': 5, 'atmMpeBridgePort': 20, 'pppBridgePort': 7.

This attribute specifies the index into the Interface Table where in information about the media interface corresponding to the bridge port is maintained.

This attribute is indicative of the number of frames that were discarded because the time taken to process these frames exceeded the transit delay allowed for this bridge unit. This attribute is not supported by bridging and will always have a value of 0.

This attribute is indicative of the number of frames discarded because the size of the out bound frame exceeded the message transfer unit (mtu) allowed for the bridge port. Note that this counter only refers to the outbound frames for this bridge port. This counter wraps around its maximum value of 4294967295. This counter is influenced by the attribute fragmentIp. This counter is incremented when the a frame larger than the mtu allowed is encountered and cannot be fragmented. If this counter is increasing steadily, it might be useful to set the value of the attribute fragmentIp to a value of on.

This group houses all the port specific operational attributes that belong to the Tb group. This group also houses all the port specific statistical attributes that belong to the Tb group. The Tb group is only applicable bridge port types that operate in the TB mode. These attributes reflect the state of a bridge port operating in the TB mode

An entry in the mscVrPpFddiETBTbOperTable.

This attribute specifies the maximum size of the information field in a TB frame. This excludes the header field.

This attribute is indicative of the number of incoming frames that were discarded because: a) the value of the secureOption attribute was set to on and b) it is not allowed to receive frames originating from the mac address found in the source address field of the frame (source mac address look up in the forwarding table failed.) on this bridge port. c) for the destination mac address found in the frame, the port the frame was received on does not appear as in port in the corresponding static table entry. Permission to receive frames from a mac address is granted via the static table entries. This attribute, badVerifyDiscards, is directly influenced by: 1. secureOption and 2. the static table entries. This counter wraps around its maximum value of 4294967295.

This attribute is indicative of the number frames discarded because the MAC address found in the destination field did not match the local MAC address of the bridge port. This counter is only applicable for the protocols that are being routed currently.This counter wraps around its maximum value of 4294967295.

This attribute is indicative of the number of frames that were discarded because of the following two reasons: a) there was no entry for the 'allowed to go' field in the static table entry, where the input port is this bridge port. b) for spanning tree bpdus that are locally processed. This counter wraps around its maximum value of 4294967295. It might prove useful to check the static table entry corresponding to the bridge port in question, if this counter consistently displays a high value. Ideally this counter should be as low as possible.

This attribute is indicative of the number of incoming frames that a) were discarded because of the fact that the bridge port, the frame is to go out of matches the bridge port it came in from or b) if the stp port state of the out port is not forwarding. This counter wraps around its maximum value of 4294967295.

This attribute is indicative of the number of frames that were discarded while this bridge port was in a state other than the forwarding state. While in learning state the frame is discarded after the information from its header is learnt. This counter wraps around its maximum value of 4294967295.

This attribute is indicative of the number of frames that were received by this bridge port and were discarded by the forwarding process. This includes frames that could have been discarded due to filtering. A repidly increasing value for this attribute could indicate a shrtage of resource in terms of memory needed to process the incoming frames. More memory can be provisioned through the VirtualRouter's memory manager.

This attribute is indicative of the number of frames that have been received by this port from its segment. Note that a frame received on this bridge port is counted if and only if it can be processed by the bridge logic contained in this bridge unit, a protocol that can be processed by the bridge logic. This counter wraps around its maximum value of 4294967295.

This attribute is indicative of the number of frames that have been transmitted out this bridge port. Note that frame transmitted out this bridge port is counted if and only if it is for a protocol being processed by the bridge unit. This also includes management frames.This counter wraps around its maximum value of 4294967295.

This group houses all the port specific operational attributes that belong to the Stp group. The Stp group is applicable to all the bridge ports that participate in the spanning tree protocol. These attributes reflect the state of the bridge port's participation in the spanning tree protocol.

An entry in the mscVrPpFddiETBStpOperTable.

This attribute specifies the spanning tree protocol state of the bridge port. Enumeration: 'listening': 3, 'disabled': 1, 'broken': 6, 'learning': 4, 'forwarding': 5, 'blocking': 2.

This attribute specifies the type of spanning tree protocol the port is participating in. A bridge port could participate in either the ieee8021 spanning tree protocol or the dec spanning tree protocol. Enumeration: 'none': 0, 'dec': 2, 'ieee8021': 3.

This attribute specifies the path cost of the designated port of the lan segment connected to the port.

This attribute specifies the contribution of this port, to all the paths to the root bridge that include this port. This attribute pathCostOper will track the value of the attribute pathCostProv when the value of the attribute pathCostMethod is set of off.

This attribute specifies the identifier of the bridge that this port considers to be the designated bridge.

This attribute specifies the port identifier of the port on the designated bridge, attached to the same lan as this port is attached to.

This attribute is indicative of the number of times this bridge port transitioned from the learning state to the forwarding state. This counter wraps around its maximum value of 4294967295. A rapidly increasing value might be indicative of an unstable spanning tree topology.

This attribute is indicative of the number of incoming frames that were discarded because the bridge port was in the blocking state. This counter wraps around its maximum value of 4294967295.

This attribute specifies the bridge identifier of the bridge recorded as the root bridge, in the configuration BPDUs sent out by the designated bridge on the segment to which the port is attached.

This group houses all the statistical attributes applicable to all types of bridge ports and represents the common factor between them. These attributes in part reflect the state of the bridge port.

An entry in the mscVrPpFddiETBStatsTable.

This attribute is indicative of the number of frames that were discarded because the data that was abstracted, from frames coming in through this bridge port, did not conform to the format expected by the bridge logic.This counter wraps around its maximum value of 4294967295.

This attribute is indicative of the number of frames received on this bridge port that used the tinygram compression scheme.

This attribute is indicative of the number of frames transmitted out this bridge port that used the tinygram compression scheme.

This attribute is indicative of the number of frames discarded at the in filter point. This includes a) frames discarded due to application of the filter defined with PCF for the in filter point and b) the frames discarded due to domain based filtering at the in filter point. This counter wraps around its maximum value of 4294967295.

This attribute is indicative of the number of frames discarded at the out filter point. This includes: a) frames discarded due to application of the filter defined with PCF for the out filter point and b) the frames discarded due to domain based filtering at the out filter point. This counter wraps around its maximum value of 4294967295.

This entry controls the addition and deletion of mscVrPpTbp components.

A single entry in the table represents a single mscVrPpTbp component.

This variable is used as the basis for SNMP naming of mscVrPpTbp components. These components can be added and deleted.

This variable provides the component's string name for use with the ASCII Console Interface

This variable represents the storage type value for the mscVrPpTbp tables.

This variable represents the index for the mscVrPpTbp tables.

This entry controls the addition and deletion of mscVrPpTbpNs components.

A single entry in the table represents a single mscVrPpTbpNs component.

This variable is used as the basis for SNMP naming of mscVrPpTbpNs components. These components can be added and deleted.

This variable provides the component's string name for use with the ASCII Console Interface

This variable represents the storage type value for the mscVrPpTbpNs tables.

This variable represents the index for the mscVrPpTbpNs tables.

This group houses all the port specific provisionable attributes associated with Ns. These attributes influence the application of filters to incoming and outgoing frames.

An entry in the mscVrPpTbpNsProvTable.

This attribute specifies the name of the filter to be applied at the incoming filter point.

This attribute specifies the name of the filter to be applied at the out going filter point.

This group houses all the provisionable attributes that belong to the this group. This group of attributes is applicable to all types of bridge ports and represent the common factor between them. These attributes influence the working of a bridge port.

An entry in the mscVrPpTbpProvTable.

This attribute specifies the type of translation to be performed on frames carrying IPX packets. Ethernet frames carrying IPX payload could be translated to IEEE 802.3 frames (with the same IPX payload) or vice- versa. The main reason to do so is to allow the bridge unit to consistently forward one type of frames carrying IPX packets. Translations can be turned off altogether in which case the IPX frames will pass through the bridge unit unchanged. Enumeration: 'snap': 3, 'ethernet': 2, 'sap': 4, 'off': 0, 'ieee8023': 1.

This attribute specifies if or not outbound frames carrying IP datagrams should be fragmented to conform to message transfer unit (mtu) sizes dictated by the media. Enumeration: 'on': 1, 'off': 0.

This attribute specifies if the frames should be ordered or not before they are transmitted through a bridge port. If this attribute has a value of ordered the received frames are ordered as in the original message, before they are transmitted out through a bridge port. If it has a value of notOrdered, received then frames pass through the bridge unit in the order they are received. This feature can be used over multiple telecommunication links to increase data flow. Please note that this attribute only affects link protocols and is ineffective with lan media. Enumeration: 'notOrdered': 1, 'ordered': 0.

This attribute is indicative of the state of the MAC address format conversion process for ARP/RARP frames. The MAC addresses may be translated if need be from a canonical format to a non-canonical format, based on the needs of the associated media. If this attribute is set to a value of on then all Mac addresses will converted if need be to suit the format of mac address, the outgoing media will support. If this attribute is set to a value of off no such conversion takes place. Enumeration: 'on': 1, 'off': 0.

This attribute is indicative of the unique number assigned to the bridge port. It is used for SNMP management of this bridge port and in spanning tree as an identifier this bridge port. Notes regarding portNum: Escape routines exist for initializing, copying, and deleting port numbers. This is necessary because SNMP requires a unique port instance identifier. The initPortNum escape routine sets the port number to a value in the range 1-255 for this purpose. The setCopiedPortNum escape routine exists to maintain the uniqueness of the port number in cases when one port is copied to another. When a bridge port is deleted, the releasePortNum escape routine places the port number being released into a pending deletion state. This is because the port number cannot be re-allocated until the port is truely deleted in the current view. This is necessary since there is no guarantee of order when processing changes to multiple protocol ports so without the pending deletion state, the same port number could be temporarily assigned to two ports for a short period of time. The portNum is set as component critical since bridging also uses the port number as a key for indexing into its data structures. If a port is deleted then re-added under the same protocol port, CAS treats the change as a SET to the portNum attribute.

This group houses all the port specific provisionable attributes that belong to the Tb group. The Tb group is only applicable bridge port types that operate in the TB mode. These attributes in part influence the working of a bridge port operating in the TB mode.

An entry in the mscVrPpTbpTbProvTable.

This attribute specifies whether the port secure feature is enabled. The secure feature, if enabled causes the following things to happen: a) disallows dynamic learning, b) disallows frames to be forwarded that do not satisfy the following condition: the mac address of the source should be found in the forwarding table and the destination mac address of the frame should also be found in the forwarding table. In addition to this, the port the frame was received on should figure as the in port, given the destination mac address found in the frame. c) disallows frames to be forwarded if the allowed to go port map for the destination mac address is empty. This feature in effect allows the user to choose the hosts that can generate traffic and the hosts that can receive traffic through this bridge unit. Enumeration: 'disabled': 0, 'enabled': 1.

This group houses all the port specific provisionable attributes that belong to the Stp group. The Stp group is applicable to all the bridge ports that participate in the spanning tree protocol. These attributes influence the participation of the bridge port in the spanning tree protocol.

An entry in the mscVrPpTbpStpProvTable.

This attribute defines the current administrative state for this component. enabled indicates that the component is available for operation. disabled indicates the component is unavailable for operation. Enumeration: 'down': 2, 'up': 1.

This attribute specifies whether or not spanning tree protocol state for this bridge port is controlled by the spanning tree protocol. In essence it indicates the participation of this bridge port in the spanning tree protocol, by accepting and acting on received bridge protocol data units and by sending out the same. on signifies that this bridge port's spanning tree port state is controlled by the spanning tree protocol. A value of off signifies that the spanning tree port state of this bridge port is unaffected by the spanning tree protocol. This in effect puts the bridge port out of reach of the spanning tree protocol and in the forwarding state. Care should be taken while assigning a value of off to this attribute, as this might cause network loops. Please do not set this attribute to off unless you are absolutely sure about the effect of such an action on your network topology. Enumeration: 'on': 1, 'off': 0.

This attribute specifies the type of spanning tree protocol the port is participating in. A bridge port could participate in either the ieee8021 spanning tree protocol or the dec spanning tree protocol. If the value of the attribute protocolSpec in the SpanningTreeProtocol component, provisioned under the TransparentBridge component is in conflict with the value of this attribute, the value of the protocolSpec attribute will prevail. Prevailing stp type is reflected in the value of the attribute stpTypeOper. Enumeration: 'dec': 2, 'ieee8021': 3.

This attribute specifies the value for port priority, which is contained in the first octet of the port identifier. Valid values are as follows: 1) 0..255 for stp type DEC and 2) 0..65535 for stp type IEEE.

This attribute specifies the contribution of this port, to all the paths to the root bridge that include this port. Please note that the value of the attribute pathCostMethod is applied only when the value of the attribute pathCostMethod is set to on and is ignored if otherwise.

This attribute specifies the method used by the bridging logic, to calculate the path cost to the bridge considered to be the root bridge in the spanning tree topology. This attribute should be set to off before attempting to provision a value for pathCostProv. Enumeration: 'dec': 2, 'off': 1, 'ieee8021': 3.

This group houses all the provisionable, domain specific attributes for a non-encapsulating bridge port.

An entry in the mscVrPpTbpDIProvTable.

This attribute specifies the domain number associated with this bridge port. Domain numbers are used for confining frames to a domain. Domain based filtering provides a complete segregation of traffic based on domain number associated with frames. There can exist only sixteen domains when a spanning tree is desired specific to each domain. When there is only a single spanning tree spanning all the domains the maximum number of domains possible are 4294967293. This attribute is of no relevance when associated with backbone bridge port. Its value is ignored in such a situation.

This attribute specifies if the domain information should be preserved or embedded in the frame header. This attribute applies only to backbone ports and does not affect the access bridge ports. By setting this attribute to a value of on, domain information could be preserved in frames being tunnelled across the a backbone, so that this information can be deciphered at the other end of the backbone tunnel. This preserves the integrity of the domains thus preventing domain breaches while tunnelling frames across backbone network. If the value of this attribute is set to off then domain information is not preserved in the header of the frames tunnelling through the backbone. This eliminates the overhead incurred to preserve domain information across the backbone while tunnelling frames across it. Preserve domain is relevant when used in conjunction with the following media: FDDI, ATM MPE, Frame Relay and PPP. It is ignored when used with other types of media. Enumeration: 'on': 1, 'off': 0.

This group contains the three OSI State attributes. The descriptions generically indicate what each state attribute implies about the component. Note that not all the values and state combinations described here are supported by every component which uses this group. For component-specific information and the valid state combinations, refer to NTP 241-7001-150, Passport Operations and Maintenance Guide.

An entry in the mscVrPpTbpStateTable.

This attribute indicates the OSI Administrative State of the component. The value locked indicates that the component is administratively prohibited from providing services for its users. A Lock or Lock - force command has been previously issued for this component. When the value is locked, the value of usageState must be idle. The value shuttingDown indicates that the component is administratively permitted to provide service to its existing users only. A Lock command was issued against the component and it is in the process of shutting down. The value unlocked indicates that the component is administratively permitted to provide services for its users. To enter this state, issue an Unlock command to this component. Enumeration: 'locked': 0, 'shuttingDown': 2, 'unlocked': 1.

This attribute indicates the OSI Operational State of the component. The value enabled indicates that the component is available for operation. Note that if adminState is locked, it would still not be providing service. The value disabled indicates that the component is not available for operation. For example, something is wrong with the component itself, or with another component on which this one depends. If the value is disabled, the usageState must be idle. Enumeration: 'disabled': 0, 'enabled': 1.

This attribute indicates the OSI Usage State of the component. The value idle indicates that the component is not currently in use. The value active indicates that the component is in use and has spare capacity to provide for additional users. The value busy indicates that the component is in use and has no spare operating capacity for additional users at this time. Enumeration: 'active': 1, 'idle': 0, 'busy': 2.

This group includes the Operational Status attribute. This attribute defines the current operational state of this component.

An entry in the mscVrPpTbpOperStatusTable.

The current state of the interface. The up state indicates the interface is operational and capable of forwarding packets. The down state indicates the interface is not operational, thus unable to forward packets. testing state indicates that no operational packets can be passed. Enumeration: 'down': 2, 'testing': 3, 'up': 1.

This group houses all the operational attributes belonging to the base group. The base group of attributes is applicable to all types of bridge ports and represent the common factor between them. These attributes in part, reflect the state of a bridge port.

An entry in the mscVrPpTbpOperTable.

The attribute portName is a string of the form 'BridgePortName-i', where BridgePortName is the abbreviation of the corresponding bridge port and i is the instance identifier of the ProtocolPort, the bridge port is provisioned under. For example a TransparentBridgePort provisioned under ProtocolPort/myport would have a name TBP-myport.

This attribute specifies the accumulated up time of this bridge port since the last reset occurred.

This attribute specifies the accumulated down time of this bridge port since the last reset occurred.

This attribute specifies the mode of bridging this port can support. It in turn implies the format of frames, this bridge port can process and forward. Enumeration: 'unknown': 1, 'tb': 2, 'srt': 4, 'sr': 3.

This attribute specifies the bridge port's configuration. It indicates if the bridge port is operating as an access port or as a backbone port. An access bridge port does not encapsulate a MAC frame and does not preserve domain information in the encapsulation, whereas a backbone bridge port encapsulates the MAC frame and optionally preserves domain information in the encapsulated frame.A backbone bridge port is typically used to transport frames across a high bandwidth backbone network to another bridge unit for further processing/forwarding of the frame. Enumeration: 'access': 1, 'backbone': 2.

This attribute specifies the type of bridge port that was provisioned. It takes into consideration the bridgingMode, bridgePortConfig and the media the bridge port is linked to before branding a bridge port. Enumeration: 'fddiBridgePort': 2, 'ethernetBridgePort': 0, 'snaDlrBridgePort': 21, 'clusterTbBridgePort': 18, 'lanEmulationClientEthernet': 22, 'frameRelayBridgePort': 6, 'srtbBridgePort': 15, 'srEncapSrBridgePort': 11, 'tbsrBridgePort': 16, 'unknown': 19, 'vcpBridgePort': 9, 'clusterSrBridgePort': 17, 'srEncapTbBridgePort': 12, 'fddiEncapsulatingBridgePort': 4, 'sourceGateSrBridgePort': 13, 'sourceGateTbBridgePort': 14, 'x25BridgePort': 10, 'smdsBridgePort': 8, 'tokenRingBridgePort': 1, 'tokenBusBridgePort': 3, 'vnsBridgePort': 5, 'atmMpeBridgePort': 20, 'pppBridgePort': 7.

This attribute specifies the index into the Interface Table where in information about the media interface corresponding to the bridge port is maintained.

This attribute is indicative of the number of frames that were discarded because the time taken to process these frames exceeded the transit delay allowed for this bridge unit. This attribute is not supported by bridging and will always have a value of 0.

This attribute is indicative of the number of frames discarded because the size of the out bound frame exceeded the message transfer unit (mtu) allowed for the bridge port. Note that this counter only refers to the outbound frames for this bridge port. This counter wraps around its maximum value of 4294967295. This counter is influenced by the attribute fragmentIp. This counter is incremented when the a frame larger than the mtu allowed is encountered and cannot be fragmented. If this counter is increasing steadily, it might be useful to set the value of the attribute fragmentIp to a value of on.

This group houses all the port specific operational attributes that belong to the Tb group. This group also houses all the port specific statistical attributes that belong to the Tb group. The Tb group is only applicable bridge port types that operate in the TB mode. These attributes reflect the state of a bridge port operating in the TB mode

An entry in the mscVrPpTbpTbOperTable.

This attribute specifies the maximum size of the information field in a TB frame. This excludes the header field.

This attribute is indicative of the number of incoming frames that were discarded because: a) the value of the secureOption attribute was set to on and b) it is not allowed to receive frames originating from the mac address found in the source address field of the frame (source mac address look up in the forwarding table failed.) on this bridge port. c) for the destination mac address found in the frame, the port the frame was received on does not appear as in port in the corresponding static table entry. Permission to receive frames from a mac address is granted via the static table entries. This attribute, badVerifyDiscards, is directly influenced by: 1. secureOption and 2. the static table entries. This counter wraps around its maximum value of 4294967295.

This attribute is indicative of the number frames discarded because the MAC address found in the destination field did not match the local MAC address of the bridge port. This counter is only applicable for the protocols that are being routed currently.This counter wraps around its maximum value of 4294967295.

This attribute is indicative of the number of frames that were discarded because of the following two reasons: a) there was no entry for the 'allowed to go' field in the static table entry, where the input port is this bridge port. b) for spanning tree bpdus that are locally processed. This counter wraps around its maximum value of 4294967295. It might prove useful to check the static table entry corresponding to the bridge port in question, if this counter consistently displays a high value. Ideally this counter should be as low as possible.

This attribute is indicative of the number of incoming frames that a) were discarded because of the fact that the bridge port, the frame is to go out of matches the bridge port it came in from or b) if the stp port state of the out port is not forwarding. This counter wraps around its maximum value of 4294967295.

This attribute is indicative of the number of frames that were discarded while this bridge port was in a state other than the forwarding state. While in learning state the frame is discarded after the information from its header is learnt. This counter wraps around its maximum value of 4294967295.

This attribute is indicative of the number of frames that were received by this bridge port and were discarded by the forwarding process. This includes frames that could have been discarded due to filtering. A repidly increasing value for this attribute could indicate a shrtage of resource in terms of memory needed to process the incoming frames. More memory can be provisioned through the VirtualRouter's memory manager.

This attribute is indicative of the number of frames that have been received by this port from its segment. Note that a frame received on this bridge port is counted if and only if it can be processed by the bridge logic contained in this bridge unit, a protocol that can be processed by the bridge logic. This counter wraps around its maximum value of 4294967295.

This attribute is indicative of the number of frames that have been transmitted out this bridge port. Note that frame transmitted out this bridge port is counted if and only if it is for a protocol being processed by the bridge unit. This also includes management frames.This counter wraps around its maximum value of 4294967295.

This group houses all the port specific operational attributes that belong to the Stp group. The Stp group is applicable to all the bridge ports that participate in the spanning tree protocol. These attributes reflect the state of the bridge port's participation in the spanning tree protocol.

An entry in the mscVrPpTbpStpOperTable.

This attribute specifies the spanning tree protocol state of the bridge port. Enumeration: 'listening': 3, 'disabled': 1, 'broken': 6, 'learning': 4, 'forwarding': 5, 'blocking': 2.

This attribute specifies the type of spanning tree protocol the port is participating in. A bridge port could participate in either the ieee8021 spanning tree protocol or the dec spanning tree protocol. Enumeration: 'none': 0, 'dec': 2, 'ieee8021': 3.

This attribute specifies the path cost of the designated port of the lan segment connected to the port.

This attribute specifies the contribution of this port, to all the paths to the root bridge that include this port. This attribute pathCostOper will track the value of the attribute pathCostProv when the value of the attribute pathCostMethod is set of off.

This attribute specifies the identifier of the bridge that this port considers to be the designated bridge.

This attribute specifies the port identifier of the port on the designated bridge, attached to the same lan as this port is attached to.

This attribute is indicative of the number of times this bridge port transitioned from the learning state to the forwarding state. This counter wraps around its maximum value of 4294967295. A rapidly increasing value might be indicative of an unstable spanning tree topology.

This attribute is indicative of the number of incoming frames that were discarded because the bridge port was in the blocking state. This counter wraps around its maximum value of 4294967295.

This attribute specifies the bridge identifier of the bridge recorded as the root bridge, in the configuration BPDUs sent out by the designated bridge on the segment to which the port is attached.

This group houses all the statistical attributes applicable to all types of bridge ports and represents the common factor between them. These attributes in part reflect the state of the bridge port.

An entry in the mscVrPpTbpStatsTable.

This attribute is indicative of the number of frames that were discarded because the data that was abstracted, from frames coming in through this bridge port, did not conform to the format expected by the bridge logic.This counter wraps around its maximum value of 4294967295.

This attribute is indicative of the number of frames received on this bridge port that used the tinygram compression scheme.

This attribute is indicative of the number of frames transmitted out this bridge port that used the tinygram compression scheme.

This attribute is indicative of the number of frames discarded at the in filter point. This includes a) frames discarded due to application of the filter defined with PCF for the in filter point and b) the frames discarded due to domain based filtering at the in filter point. This counter wraps around its maximum value of 4294967295.

This attribute is indicative of the number of frames discarded at the out filter point. This includes: a) frames discarded due to application of the filter defined with PCF for the out filter point and b) the frames discarded due to domain based filtering at the out filter point. This counter wraps around its maximum value of 4294967295.

This entry controls the addition and deletion of mscVrPpSrBp components.

A single entry in the table represents a single mscVrPpSrBp component.

This variable is used as the basis for SNMP naming of mscVrPpSrBp components. These components can be added and deleted.

This variable provides the component's string name for use with the ASCII Console Interface

This variable represents the storage type value for the mscVrPpSrBp tables.

This variable represents the index for the mscVrPpSrBp tables.

This entry controls the addition and deletion of mscVrPpSrBpNs components.

A single entry in the table represents a single mscVrPpSrBpNs component.

This variable is used as the basis for SNMP naming of mscVrPpSrBpNs components. These components can be added and deleted.

This variable provides the component's string name for use with the ASCII Console Interface

This variable represents the storage type value for the mscVrPpSrBpNs tables.

This variable represents the index for the mscVrPpSrBpNs tables.

This group houses all the port specific provisionable attributes associated with Ns. These attributes influence the application of filters to incoming and outgoing frames.

An entry in the mscVrPpSrBpNsProvTable.

This attribute specifies the name of the filter to be applied at the incoming filter point.

This attribute specifies the name of the filter to be applied at the out going filter point.

This group houses all the provisionable attributes that belong to the this group. This group of attributes is applicable to all types of bridge ports and represent the common factor between them. These attributes influence the working of a bridge port.

An entry in the mscVrPpSrBpProvTable.

This attribute specifies the type of translation to be performed on frames carrying IPX packets. Ethernet frames carrying IPX payload could be translated to IEEE 802.3 frames (with the same IPX payload) or vice- versa. The main reason to do so is to allow the bridge unit to consistently forward one type of frames carrying IPX packets. Translations can be turned off altogether in which case the IPX frames will pass through the bridge unit unchanged. Enumeration: 'snap': 3, 'ethernet': 2, 'sap': 4, 'off': 0, 'ieee8023': 1.

This attribute specifies if or not outbound frames carrying IP datagrams should be fragmented to conform to message transfer unit (mtu) sizes dictated by the media. Enumeration: 'on': 1, 'off': 0.

This attribute specifies if the frames should be ordered or not before they are transmitted through a bridge port. If this attribute has a value of ordered the received frames are ordered as in the original message, before they are transmitted out through a bridge port. If it has a value of notOrdered, received then frames pass through the bridge unit in the order they are received. This feature can be used over multiple telecommunication links to increase data flow. Please note that this attribute only affects link protocols and is ineffective with lan media. Enumeration: 'notOrdered': 1, 'ordered': 0.

This attribute is indicative of the state of the MAC address format conversion process for ARP/RARP frames. The MAC addresses may be translated if need be from a canonical format to a non-canonical format, based on the needs of the associated media. If this attribute is set to a value of on then all Mac addresses will converted if need be to suit the format of mac address, the outgoing media will support. If this attribute is set to a value of off no such conversion takes place. Enumeration: 'on': 1, 'off': 0.

This attribute is indicative of the unique number assigned to the bridge port. It is used for SNMP management of this bridge port and in spanning tree as an identifier this bridge port. Notes regarding portNum: Escape routines exist for initializing, copying, and deleting port numbers. This is necessary because SNMP requires a unique port instance identifier. The initPortNum escape routine sets the port number to a value in the range 1-255 for this purpose. The setCopiedPortNum escape routine exists to maintain the uniqueness of the port number in cases when one port is copied to another. When a bridge port is deleted, the releasePortNum escape routine places the port number being released into a pending deletion state. This is because the port number cannot be re-allocated until the port is truely deleted in the current view. This is necessary since there is no guarantee of order when processing changes to multiple protocol ports so without the pending deletion state, the same port number could be temporarily assigned to two ports for a short period of time. The portNum is set as component critical since bridging also uses the port number as a key for indexing into its data structures. If a port is deleted then re-added under the same protocol port, CAS treats the change as a SET to the portNum attribute.

This group houses all the port specific provisionable attributes that belong to the Stp group. The Stp group is applicable to all the bridge ports that participate in the spanning tree protocol. These attributes influence the participation of the bridge port in the spanning tree protocol.

An entry in the mscVrPpSrBpStpProvTable.

This attribute defines the current administrative state for this component. enabled indicates that the component is available for operation. disabled indicates the component is unavailable for operation. Enumeration: 'down': 2, 'up': 1.

This attribute specifies whether or not spanning tree protocol state for this bridge port is controlled by the spanning tree protocol. In essence it indicates the participation of this bridge port in the spanning tree protocol, by accepting and acting on received bridge protocol data units and by sending out the same. on signifies that this bridge port's spanning tree port state is controlled by the spanning tree protocol. A value of off signifies that the spanning tree port state of this bridge port is unaffected by the spanning tree protocol. This in effect puts the bridge port out of reach of the spanning tree protocol and in the forwarding state. Care should be taken while assigning a value of off to this attribute, as this might cause network loops. Please do not set this attribute to off unless you are absolutely sure about the effect of such an action on your network topology. Enumeration: 'on': 1, 'off': 0.

This attribute specifies the type of spanning tree protocol the port is participating in. A bridge port could participate in either the ieee8021 spanning tree protocol or the dec spanning tree protocol. If the value of the attribute protocolSpec in the SpanningTreeProtocol component, provisioned under the TransparentBridge component is in conflict with the value of this attribute, the value of the protocolSpec attribute will prevail. Prevailing stp type is reflected in the value of the attribute stpTypeOper. Enumeration: 'dec': 2, 'ieee8021': 3.

This attribute specifies the value for port priority, which is contained in the first octet of the port identifier. Valid values are as follows: 1) 0..255 for stp type DEC and 2) 0..65535 for stp type IEEE.

This attribute specifies the contribution of this port, to all the paths to the root bridge that include this port. Please note that the value of the attribute pathCostMethod is applied only when the value of the attribute pathCostMethod is set to on and is ignored if otherwise.

This attribute specifies the method used by the bridging logic, to calculate the path cost to the bridge considered to be the root bridge in the spanning tree topology. This attribute should be set to off before attempting to provision a value for pathCostProv. Enumeration: 'dec': 2, 'off': 1, 'ieee8021': 3.

This group houses all the provisionable, domain specific attributes for a non-encapsulating bridge port.

An entry in the mscVrPpSrBpDIProvTable.

This attribute specifies the domain number associated with this bridge port. Domain numbers are used for confining frames to a domain. Domain based filtering provides a complete segregation of traffic based on domain number associated with frames. There can exist only sixteen domains when a spanning tree is desired specific to each domain. When there is only a single spanning tree spanning all the domains the maximum number of domains possible are 4294967293. This attribute is of no relevance when associated with backbone bridge port. Its value is ignored in such a situation.

This attribute specifies if the domain information should be preserved or embedded in the frame header. This attribute applies only to backbone ports and does not affect the access bridge ports. By setting this attribute to a value of on, domain information could be preserved in frames being tunnelled across the a backbone, so that this information can be deciphered at the other end of the backbone tunnel. This preserves the integrity of the domains thus preventing domain breaches while tunnelling frames across backbone network. If the value of this attribute is set to off then domain information is not preserved in the header of the frames tunnelling through the backbone. This eliminates the overhead incurred to preserve domain information across the backbone while tunnelling frames across it. Preserve domain is relevant when used in conjunction with the following media: FDDI, ATM MPE, Frame Relay and PPP. It is ignored when used with other types of media. Enumeration: 'on': 1, 'off': 0.

This group contains the three OSI State attributes. The descriptions generically indicate what each state attribute implies about the component. Note that not all the values and state combinations described here are supported by every component which uses this group. For component-specific information and the valid state combinations, refer to NTP 241-7001-150, Passport Operations and Maintenance Guide.

An entry in the mscVrPpSrBpStateTable.

This attribute indicates the OSI Administrative State of the component. The value locked indicates that the component is administratively prohibited from providing services for its users. A Lock or Lock - force command has been previously issued for this component. When the value is locked, the value of usageState must be idle. The value shuttingDown indicates that the component is administratively permitted to provide service to its existing users only. A Lock command was issued against the component and it is in the process of shutting down. The value unlocked indicates that the component is administratively permitted to provide services for its users. To enter this state, issue an Unlock command to this component. Enumeration: 'locked': 0, 'shuttingDown': 2, 'unlocked': 1.

This attribute indicates the OSI Operational State of the component. The value enabled indicates that the component is available for operation. Note that if adminState is locked, it would still not be providing service. The value disabled indicates that the component is not available for operation. For example, something is wrong with the component itself, or with another component on which this one depends. If the value is disabled, the usageState must be idle. Enumeration: 'disabled': 0, 'enabled': 1.

This attribute indicates the OSI Usage State of the component. The value idle indicates that the component is not currently in use. The value active indicates that the component is in use and has spare capacity to provide for additional users. The value busy indicates that the component is in use and has no spare operating capacity for additional users at this time. Enumeration: 'active': 1, 'idle': 0, 'busy': 2.

This group includes the Operational Status attribute. This attribute defines the current operational state of this component.

An entry in the mscVrPpSrBpOperStatusTable.

The current state of the interface. The up state indicates the interface is operational and capable of forwarding packets. The down state indicates the interface is not operational, thus unable to forward packets. testing state indicates that no operational packets can be passed. Enumeration: 'down': 2, 'testing': 3, 'up': 1.

This group houses all the operational attributes belonging to the base group. The base group of attributes is applicable to all types of bridge ports and represent the common factor between them. These attributes in part, reflect the state of a bridge port.

An entry in the mscVrPpSrBpOperTable.

The attribute portName is a string of the form 'BridgePortName-i', where BridgePortName is the abbreviation of the corresponding bridge port and i is the instance identifier of the ProtocolPort, the bridge port is provisioned under. For example a TransparentBridgePort provisioned under ProtocolPort/myport would have a name TBP-myport.

This attribute specifies the accumulated up time of this bridge port since the last reset occurred.

This attribute specifies the accumulated down time of this bridge port since the last reset occurred.

This attribute specifies the mode of bridging this port can support. It in turn implies the format of frames, this bridge port can process and forward. Enumeration: 'unknown': 1, 'tb': 2, 'srt': 4, 'sr': 3.

This attribute specifies the bridge port's configuration. It indicates if the bridge port is operating as an access port or as a backbone port. An access bridge port does not encapsulate a MAC frame and does not preserve domain information in the encapsulation, whereas a backbone bridge port encapsulates the MAC frame and optionally preserves domain information in the encapsulated frame.A backbone bridge port is typically used to transport frames across a high bandwidth backbone network to another bridge unit for further processing/forwarding of the frame. Enumeration: 'access': 1, 'backbone': 2.

This attribute specifies the type of bridge port that was provisioned. It takes into consideration the bridgingMode, bridgePortConfig and the media the bridge port is linked to before branding a bridge port. Enumeration: 'fddiBridgePort': 2, 'ethernetBridgePort': 0, 'snaDlrBridgePort': 21, 'clusterTbBridgePort': 18, 'lanEmulationClientEthernet': 22, 'frameRelayBridgePort': 6, 'srtbBridgePort': 15, 'srEncapSrBridgePort': 11, 'tbsrBridgePort': 16, 'unknown': 19, 'vcpBridgePort': 9, 'clusterSrBridgePort': 17, 'srEncapTbBridgePort': 12, 'fddiEncapsulatingBridgePort': 4, 'sourceGateSrBridgePort': 13, 'sourceGateTbBridgePort': 14, 'x25BridgePort': 10, 'smdsBridgePort': 8, 'tokenRingBridgePort': 1, 'tokenBusBridgePort': 3, 'vnsBridgePort': 5, 'atmMpeBridgePort': 20, 'pppBridgePort': 7.

This attribute specifies the index into the Interface Table where in information about the media interface corresponding to the bridge port is maintained.

This attribute is indicative of the number of frames that were discarded because the time taken to process these frames exceeded the transit delay allowed for this bridge unit. This attribute is not supported by bridging and will always have a value of 0.

This attribute is indicative of the number of frames discarded because the size of the out bound frame exceeded the message transfer unit (mtu) allowed for the bridge port. Note that this counter only refers to the outbound frames for this bridge port. This counter wraps around its maximum value of 4294967295. This counter is influenced by the attribute fragmentIp. This counter is incremented when the a frame larger than the mtu allowed is encountered and cannot be fragmented. If this counter is increasing steadily, it might be useful to set the value of the attribute fragmentIp to a value of on.

This group houses all the port specific operational attributes that belong to the Stp group. The Stp group is applicable to all the bridge ports that participate in the spanning tree protocol. These attributes reflect the state of the bridge port's participation in the spanning tree protocol.

An entry in the mscVrPpSrBpStpOperTable.

This attribute specifies the spanning tree protocol state of the bridge port. Enumeration: 'listening': 3, 'disabled': 1, 'broken': 6, 'learning': 4, 'forwarding': 5, 'blocking': 2.

This attribute specifies the type of spanning tree protocol the port is participating in. A bridge port could participate in either the ieee8021 spanning tree protocol or the dec spanning tree protocol. Enumeration: 'none': 0, 'dec': 2, 'ieee8021': 3.

This attribute specifies the path cost of the designated port of the lan segment connected to the port.

This attribute specifies the contribution of this port, to all the paths to the root bridge that include this port. This attribute pathCostOper will track the value of the attribute pathCostProv when the value of the attribute pathCostMethod is set of off.

This attribute specifies the identifier of the bridge that this port considers to be the designated bridge.

This attribute specifies the port identifier of the port on the designated bridge, attached to the same lan as this port is attached to.

This attribute is indicative of the number of times this bridge port transitioned from the learning state to the forwarding state. This counter wraps around its maximum value of 4294967295. A rapidly increasing value might be indicative of an unstable spanning tree topology.

This attribute is indicative of the number of incoming frames that were discarded because the bridge port was in the blocking state. This counter wraps around its maximum value of 4294967295.

This attribute specifies the bridge identifier of the bridge recorded as the root bridge, in the configuration BPDUs sent out by the designated bridge on the segment to which the port is attached.

This group houses all the statistical attributes applicable to all types of bridge ports and represents the common factor between them. These attributes in part reflect the state of the bridge port.

An entry in the mscVrPpSrBpStatsTable.

This attribute is indicative of the number of frames that were discarded because the data that was abstracted, from frames coming in through this bridge port, did not conform to the format expected by the bridge logic.This counter wraps around its maximum value of 4294967295.

This attribute is indicative of the number of frames received on this bridge port that used the tinygram compression scheme.

This attribute is indicative of the number of frames transmitted out this bridge port that used the tinygram compression scheme.

This attribute is indicative of the number of frames discarded at the in filter point. This includes a) frames discarded due to application of the filter defined with PCF for the in filter point and b) the frames discarded due to domain based filtering at the in filter point. This counter wraps around its maximum value of 4294967295.

This attribute is indicative of the number of frames discarded at the out filter point. This includes: a) frames discarded due to application of the filter defined with PCF for the out filter point and b) the frames discarded due to domain based filtering at the out filter point. This counter wraps around its maximum value of 4294967295.

This group contains all port specific, provisionable attributes associated with SourceRouteBridge ports.

An entry in the mscVrPpSrBpSrProvTable.

This attribute specifies the maximum number of hops allowed in Spanning Tree Explore and All Routes Explore frames. This value is one less than the maximum number of route descriptors allowed in a source route frame

This attribute specifies whether or not explore frames received from SourceRouteBridge ports will be sent to the SRTB-8209 translation or the encapsulated SourceRouteBridge logic. This option is used only when both the TbsrBridgePort and the SrtbBridgePort are provisioned and enabled. A value of Xlate implies that the explore frames will be sent to the Srtb translation logic and a value of Encap implies that the frames will be sent to the Encapsulated source route bridging logic. Enumeration: 'xlate': 1, 'encap': 0.

This attribute specifies the identifier for the physical LAN that this port is attached. All SourceRouteBridge ports are assigned to a physical LAN and a logical internal LAN. Current source route bridge implementations limit the lanId to a value in the range 0 to 4095.

This attribute specifies the identifier for the internal logical LAN this port is attached. All SourceRouteBridge ports are assigned to a physical LAN and a logical internal LAN. Current source route bridge implementations limit the lanId to a value in the range 0 to 4095.

This attribute specifies the value that is used to identify this bridge when more than one bridge is used to span the same two LAN segments.

This attribute specifies the maximum frame size (LLC and above) in octets, allowed by this SourceRouteBridge port. This field is used to determine whether a modification of the largest frame field of the routing control field of the routing information field is warranted.

This attribute determines how this bridge port will react when presented with a Spanning Tree Explore frame. If disabled, the Spanning Tree Explore frame is discarded regardless of the value of stpPortState. If the value of this attribute is forced, the Spanning Tree Explore frame is forwarded regardless of the value of stpPortState. autoSpan uses the stpPortState value to decide whether or not Spanning Tree Explore frames should be forwarded out this bridge port. If the port is in the forwarding state, the frame is received and transmitted otherwise the frame is discarded. Enumeration: 'disabled': 2, 'autoSpan': 1, 'forced': 3.

This attribute specifies the number of route descriptors allowed in an All Routes Explore frame received on a SourceRouteBridgePort or SourceRouteTransparentBridgePort. Current source route bridge implementations limit the areRdLimit to a value in the range 0 to 8.

This attribute specifies the number of route descriptors allowed in a Spanning Tree Explore frame received on a SourceRouteBridgePort or SourceRouteTransparentBridgePort. Current source route bridge implementations limit the steRdLimit to a value in the range 0 to 8.

This group contains all port specific statistical attributes associated with SourceRouteBridge ports.

An entry in the mscVrPpSrBpSrStatsTable.

This attribute specifies the number of specifically routed frames that were received by this bridge port. A specifically routed frame has a route descriptor, constructed by the originating host which details an explicit route to the destination host. This counter will wrap to zero when it exceeds its maximum.

This attribute specifies the number of specifically routed frames that were transmitted from this bridge port. This counter will wrap to zero when it exceeds its maximum.

This attribute specifies the number of All Path Explore frames received on this bridge port. The All Path Explore frames are forwarded to all SourceRouteBridge ports assigned to this bridge regardless of the port's portStpStates. This counter will wrap to zero when it exceeds its maximum.

This attribute specifies the number of All Path Explore frames transmitted on this bridge port. The All Path Explore frames are forwarded to all SourceRouteBridge ports assigned to this bridge regardless of the port's portStpState state. This counter will wrap to zero when it exceeds its maximum.

This attribute specifies the number of Spanning Tree Explore frames received on this bridge port. The Spanning Tree Explore frames are only forwarded through bridge ports whose portStpState has a value of forwarding. This counter will wrap to zero when it exceeds its maximum.

This attribute specifies the number of Spanning Tree Frames transmitted on this bridge port. This counter will wrap to zero when it exceeds its maximum.

This attribute specifies the number of All Routes Explore and Spanning Tree Explore frames that were discarded due to an invalid next segment value in the routing information field. This counter will wrap to zero when it exceeds its maximum.

This attribute specifies the number of frames discarded due to the presence of a duplicate segment identifier in the route descriptor field which may indicate a loop in the network topology. This counter will wrap to zero when it exceeds its maximum.

This attribute specifies the number of All Routes Explore and Spanning Tree Explore frames discarded by this bridge port due to a frame exceeding the maximum size allowed for a route descriptor length. This counter will wrap to zero when it exceeds its maximum.

This attribute specifies the number frames received which contain duplicate LAN IDs or Tree errors. This attribute is helpful in debugging problems in networks which contain older IBM-SR bridges. This counter will wrap to zero when it exceeds its maximum.

This attributes counts the number of All Routes Explore or Spanning Tree Explore frames that were discarded because the last LAN ID in the routing information field did not equal the LAN ID. This counter will wrap to zero when it exceeds its maximum.

This attribute is indicative of the number of explorer frames discarded due to fact that the outbound SourceRouteBridge port was disabled or deleted. This counter will wrap to zero when it exceeds its maximum.

This attribute specifies the number of frames discarded due to receiving a frame with a target LAN ID which did not match the internal LAN ID of the receiving bridge port. This counter will wrap to zero when it exceeds its maximum.

This entry controls the addition and deletion of mscVrPpSrtBp components.

A single entry in the table represents a single mscVrPpSrtBp component.

This variable is used as the basis for SNMP naming of mscVrPpSrtBp components. These components can be added and deleted.

This variable provides the component's string name for use with the ASCII Console Interface

This variable represents the storage type value for the mscVrPpSrtBp tables.

This variable represents the index for the mscVrPpSrtBp tables.

This entry controls the addition and deletion of mscVrPpSrtBpNs components.

A single entry in the table represents a single mscVrPpSrtBpNs component.

This variable is used as the basis for SNMP naming of mscVrPpSrtBpNs components. These components can be added and deleted.

This variable provides the component's string name for use with the ASCII Console Interface

This variable represents the storage type value for the mscVrPpSrtBpNs tables.

This variable represents the index for the mscVrPpSrtBpNs tables.

This group houses all the port specific provisionable attributes associated with Ns. These attributes influence the application of filters to incoming and outgoing frames.

An entry in the mscVrPpSrtBpNsProvTable.

This attribute specifies the name of the filter to be applied at the incoming filter point.

This attribute specifies the name of the filter to be applied at the out going filter point.

This group houses all the provisionable attributes that belong to the this group. This group of attributes is applicable to all types of bridge ports and represent the common factor between them. These attributes influence the working of a bridge port.

An entry in the mscVrPpSrtBpProvTable.

This attribute specifies the type of translation to be performed on frames carrying IPX packets. Ethernet frames carrying IPX payload could be translated to IEEE 802.3 frames (with the same IPX payload) or vice- versa. The main reason to do so is to allow the bridge unit to consistently forward one type of frames carrying IPX packets. Translations can be turned off altogether in which case the IPX frames will pass through the bridge unit unchanged. Enumeration: 'snap': 3, 'ethernet': 2, 'sap': 4, 'off': 0, 'ieee8023': 1.

This attribute specifies if or not outbound frames carrying IP datagrams should be fragmented to conform to message transfer unit (mtu) sizes dictated by the media. Enumeration: 'on': 1, 'off': 0.

This attribute specifies if the frames should be ordered or not before they are transmitted through a bridge port. If this attribute has a value of ordered the received frames are ordered as in the original message, before they are transmitted out through a bridge port. If it has a value of notOrdered, received then frames pass through the bridge unit in the order they are received. This feature can be used over multiple telecommunication links to increase data flow. Please note that this attribute only affects link protocols and is ineffective with lan media. Enumeration: 'notOrdered': 1, 'ordered': 0.

This attribute is indicative of the state of the MAC address format conversion process for ARP/RARP frames. The MAC addresses may be translated if need be from a canonical format to a non-canonical format, based on the needs of the associated media. If this attribute is set to a value of on then all Mac addresses will converted if need be to suit the format of mac address, the outgoing media will support. If this attribute is set to a value of off no such conversion takes place. Enumeration: 'on': 1, 'off': 0.

This attribute is indicative of the unique number assigned to the bridge port. It is used for SNMP management of this bridge port and in spanning tree as an identifier this bridge port. Notes regarding portNum: Escape routines exist for initializing, copying, and deleting port numbers. This is necessary because SNMP requires a unique port instance identifier. The initPortNum escape routine sets the port number to a value in the range 1-255 for this purpose. The setCopiedPortNum escape routine exists to maintain the uniqueness of the port number in cases when one port is copied to another. When a bridge port is deleted, the releasePortNum escape routine places the port number being released into a pending deletion state. This is because the port number cannot be re-allocated until the port is truely deleted in the current view. This is necessary since there is no guarantee of order when processing changes to multiple protocol ports so without the pending deletion state, the same port number could be temporarily assigned to two ports for a short period of time. The portNum is set as component critical since bridging also uses the port number as a key for indexing into its data structures. If a port is deleted then re-added under the same protocol port, CAS treats the change as a SET to the portNum attribute.

This group houses all the port specific provisionable attributes that belong to the Tb group. The Tb group is only applicable bridge port types that operate in the TB mode. These attributes in part influence the working of a bridge port operating in the TB mode.

An entry in the mscVrPpSrtBpTbProvTable.

This attribute specifies whether the port secure feature is enabled. The secure feature, if enabled causes the following things to happen: a) disallows dynamic learning, b) disallows frames to be forwarded that do not satisfy the following condition: the mac address of the source should be found in the forwarding table and the destination mac address of the frame should also be found in the forwarding table. In addition to this, the port the frame was received on should figure as the in port, given the destination mac address found in the frame. c) disallows frames to be forwarded if the allowed to go port map for the destination mac address is empty. This feature in effect allows the user to choose the hosts that can generate traffic and the hosts that can receive traffic through this bridge unit. Enumeration: 'disabled': 0, 'enabled': 1.

This group houses all the port specific provisionable attributes that belong to the Stp group. The Stp group is applicable to all the bridge ports that participate in the spanning tree protocol. These attributes influence the participation of the bridge port in the spanning tree protocol.

An entry in the mscVrPpSrtBpStpProvTable.

This attribute defines the current administrative state for this component. enabled indicates that the component is available for operation. disabled indicates the component is unavailable for operation. Enumeration: 'down': 2, 'up': 1.

This attribute specifies whether or not spanning tree protocol state for this bridge port is controlled by the spanning tree protocol. In essence it indicates the participation of this bridge port in the spanning tree protocol, by accepting and acting on received bridge protocol data units and by sending out the same. on signifies that this bridge port's spanning tree port state is controlled by the spanning tree protocol. A value of off signifies that the spanning tree port state of this bridge port is unaffected by the spanning tree protocol. This in effect puts the bridge port out of reach of the spanning tree protocol and in the forwarding state. Care should be taken while assigning a value of off to this attribute, as this might cause network loops. Please do not set this attribute to off unless you are absolutely sure about the effect of such an action on your network topology. Enumeration: 'on': 1, 'off': 0.

This attribute specifies the type of spanning tree protocol the port is participating in. A bridge port could participate in either the ieee8021 spanning tree protocol or the dec spanning tree protocol. If the value of the attribute protocolSpec in the SpanningTreeProtocol component, provisioned under the TransparentBridge component is in conflict with the value of this attribute, the value of the protocolSpec attribute will prevail. Prevailing stp type is reflected in the value of the attribute stpTypeOper. Enumeration: 'dec': 2, 'ieee8021': 3.

This attribute specifies the value for port priority, which is contained in the first octet of the port identifier. Valid values are as follows: 1) 0..255 for stp type DEC and 2) 0..65535 for stp type IEEE.

This attribute specifies the contribution of this port, to all the paths to the root bridge that include this port. Please note that the value of the attribute pathCostMethod is applied only when the value of the attribute pathCostMethod is set to on and is ignored if otherwise.

This attribute specifies the method used by the bridging logic, to calculate the path cost to the bridge considered to be the root bridge in the spanning tree topology. This attribute should be set to off before attempting to provision a value for pathCostProv. Enumeration: 'dec': 2, 'off': 1, 'ieee8021': 3.

This group houses all the provisionable, domain specific attributes for a non-encapsulating bridge port.

An entry in the mscVrPpSrtBpDIProvTable.

This attribute specifies the domain number associated with this bridge port. Domain numbers are used for confining frames to a domain. Domain based filtering provides a complete segregation of traffic based on domain number associated with frames. There can exist only sixteen domains when a spanning tree is desired specific to each domain. When there is only a single spanning tree spanning all the domains the maximum number of domains possible are 4294967293. This attribute is of no relevance when associated with backbone bridge port. Its value is ignored in such a situation.

This attribute specifies if the domain information should be preserved or embedded in the frame header. This attribute applies only to backbone ports and does not affect the access bridge ports. By setting this attribute to a value of on, domain information could be preserved in frames being tunnelled across the a backbone, so that this information can be deciphered at the other end of the backbone tunnel. This preserves the integrity of the domains thus preventing domain breaches while tunnelling frames across backbone network. If the value of this attribute is set to off then domain information is not preserved in the header of the frames tunnelling through the backbone. This eliminates the overhead incurred to preserve domain information across the backbone while tunnelling frames across it. Preserve domain is relevant when used in conjunction with the following media: FDDI, ATM MPE, Frame Relay and PPP. It is ignored when used with other types of media. Enumeration: 'on': 1, 'off': 0.

This group contains the three OSI State attributes. The descriptions generically indicate what each state attribute implies about the component. Note that not all the values and state combinations described here are supported by every component which uses this group. For component-specific information and the valid state combinations, refer to NTP 241-7001-150, Passport Operations and Maintenance Guide.

An entry in the mscVrPpSrtBpStateTable.

This attribute indicates the OSI Administrative State of the component. The value locked indicates that the component is administratively prohibited from providing services for its users. A Lock or Lock - force command has been previously issued for this component. When the value is locked, the value of usageState must be idle. The value shuttingDown indicates that the component is administratively permitted to provide service to its existing users only. A Lock command was issued against the component and it is in the process of shutting down. The value unlocked indicates that the component is administratively permitted to provide services for its users. To enter this state, issue an Unlock command to this component. Enumeration: 'locked': 0, 'shuttingDown': 2, 'unlocked': 1.

This attribute indicates the OSI Operational State of the component. The value enabled indicates that the component is available for operation. Note that if adminState is locked, it would still not be providing service. The value disabled indicates that the component is not available for operation. For example, something is wrong with the component itself, or with another component on which this one depends. If the value is disabled, the usageState must be idle. Enumeration: 'disabled': 0, 'enabled': 1.

This attribute indicates the OSI Usage State of the component. The value idle indicates that the component is not currently in use. The value active indicates that the component is in use and has spare capacity to provide for additional users. The value busy indicates that the component is in use and has no spare operating capacity for additional users at this time. Enumeration: 'active': 1, 'idle': 0, 'busy': 2.

This group includes the Operational Status attribute. This attribute defines the current operational state of this component.

An entry in the mscVrPpSrtBpOperStatusTable.

The current state of the interface. The up state indicates the interface is operational and capable of forwarding packets. The down state indicates the interface is not operational, thus unable to forward packets. testing state indicates that no operational packets can be passed. Enumeration: 'down': 2, 'testing': 3, 'up': 1.

This group houses all the operational attributes belonging to the base group. The base group of attributes is applicable to all types of bridge ports and represent the common factor between them. These attributes in part, reflect the state of a bridge port.

An entry in the mscVrPpSrtBpOperTable.

The attribute portName is a string of the form 'BridgePortName-i', where BridgePortName is the abbreviation of the corresponding bridge port and i is the instance identifier of the ProtocolPort, the bridge port is provisioned under. For example a TransparentBridgePort provisioned under ProtocolPort/myport would have a name TBP-myport.

This attribute specifies the accumulated up time of this bridge port since the last reset occurred.

This attribute specifies the accumulated down time of this bridge port since the last reset occurred.

This attribute specifies the mode of bridging this port can support. It in turn implies the format of frames, this bridge port can process and forward. Enumeration: 'unknown': 1, 'tb': 2, 'srt': 4, 'sr': 3.

This attribute specifies the bridge port's configuration. It indicates if the bridge port is operating as an access port or as a backbone port. An access bridge port does not encapsulate a MAC frame and does not preserve domain information in the encapsulation, whereas a backbone bridge port encapsulates the MAC frame and optionally preserves domain information in the encapsulated frame.A backbone bridge port is typically used to transport frames across a high bandwidth backbone network to another bridge unit for further processing/forwarding of the frame. Enumeration: 'access': 1, 'backbone': 2.

This attribute specifies the type of bridge port that was provisioned. It takes into consideration the bridgingMode, bridgePortConfig and the media the bridge port is linked to before branding a bridge port. Enumeration: 'fddiBridgePort': 2, 'ethernetBridgePort': 0, 'snaDlrBridgePort': 21, 'clusterTbBridgePort': 18, 'lanEmulationClientEthernet': 22, 'frameRelayBridgePort': 6, 'srtbBridgePort': 15, 'srEncapSrBridgePort': 11, 'tbsrBridgePort': 16, 'unknown': 19, 'vcpBridgePort': 9, 'clusterSrBridgePort': 17, 'srEncapTbBridgePort': 12, 'fddiEncapsulatingBridgePort': 4, 'sourceGateSrBridgePort': 13, 'sourceGateTbBridgePort': 14, 'x25BridgePort': 10, 'smdsBridgePort': 8, 'tokenRingBridgePort': 1, 'tokenBusBridgePort': 3, 'vnsBridgePort': 5, 'atmMpeBridgePort': 20, 'pppBridgePort': 7.

This attribute specifies the index into the Interface Table where in information about the media interface corresponding to the bridge port is maintained.

This attribute is indicative of the number of frames that were discarded because the time taken to process these frames exceeded the transit delay allowed for this bridge unit. This attribute is not supported by bridging and will always have a value of 0.

This attribute is indicative of the number of frames discarded because the size of the out bound frame exceeded the message transfer unit (mtu) allowed for the bridge port. Note that this counter only refers to the outbound frames for this bridge port. This counter wraps around its maximum value of 4294967295. This counter is influenced by the attribute fragmentIp. This counter is incremented when the a frame larger than the mtu allowed is encountered and cannot be fragmented. If this counter is increasing steadily, it might be useful to set the value of the attribute fragmentIp to a value of on.

This group houses all the port specific operational attributes that belong to the Tb group. This group also houses all the port specific statistical attributes that belong to the Tb group. The Tb group is only applicable bridge port types that operate in the TB mode. These attributes reflect the state of a bridge port operating in the TB mode

An entry in the mscVrPpSrtBpTbOperTable.

This attribute specifies the maximum size of the information field in a TB frame. This excludes the header field.

This attribute is indicative of the number of incoming frames that were discarded because: a) the value of the secureOption attribute was set to on and b) it is not allowed to receive frames originating from the mac address found in the source address field of the frame (source mac address look up in the forwarding table failed.) on this bridge port. c) for the destination mac address found in the frame, the port the frame was received on does not appear as in port in the corresponding static table entry. Permission to receive frames from a mac address is granted via the static table entries. This attribute, badVerifyDiscards, is directly influenced by: 1. secureOption and 2. the static table entries. This counter wraps around its maximum value of 4294967295.

This attribute is indicative of the number frames discarded because the MAC address found in the destination field did not match the local MAC address of the bridge port. This counter is only applicable for the protocols that are being routed currently.This counter wraps around its maximum value of 4294967295.

This attribute is indicative of the number of frames that were discarded because of the following two reasons: a) there was no entry for the 'allowed to go' field in the static table entry, where the input port is this bridge port. b) for spanning tree bpdus that are locally processed. This counter wraps around its maximum value of 4294967295. It might prove useful to check the static table entry corresponding to the bridge port in question, if this counter consistently displays a high value. Ideally this counter should be as low as possible.

This attribute is indicative of the number of incoming frames that a) were discarded because of the fact that the bridge port, the frame is to go out of matches the bridge port it came in from or b) if the stp port state of the out port is not forwarding. This counter wraps around its maximum value of 4294967295.

This attribute is indicative of the number of frames that were discarded while this bridge port was in a state other than the forwarding state. While in learning state the frame is discarded after the information from its header is learnt. This counter wraps around its maximum value of 4294967295.

This attribute is indicative of the number of frames that were received by this bridge port and were discarded by the forwarding process. This includes frames that could have been discarded due to filtering. A repidly increasing value for this attribute could indicate a shrtage of resource in terms of memory needed to process the incoming frames. More memory can be provisioned through the VirtualRouter's memory manager.

This attribute is indicative of the number of frames that have been received by this port from its segment. Note that a frame received on this bridge port is counted if and only if it can be processed by the bridge logic contained in this bridge unit, a protocol that can be processed by the bridge logic. This counter wraps around its maximum value of 4294967295.

This attribute is indicative of the number of frames that have been transmitted out this bridge port. Note that frame transmitted out this bridge port is counted if and only if it is for a protocol being processed by the bridge unit. This also includes management frames.This counter wraps around its maximum value of 4294967295.

This group houses all the port specific operational attributes that belong to the Stp group. The Stp group is applicable to all the bridge ports that participate in the spanning tree protocol. These attributes reflect the state of the bridge port's participation in the spanning tree protocol.

An entry in the mscVrPpSrtBpStpOperTable.

This attribute specifies the spanning tree protocol state of the bridge port. Enumeration: 'listening': 3, 'disabled': 1, 'broken': 6, 'learning': 4, 'forwarding': 5, 'blocking': 2.

This attribute specifies the type of spanning tree protocol the port is participating in. A bridge port could participate in either the ieee8021 spanning tree protocol or the dec spanning tree protocol. Enumeration: 'none': 0, 'dec': 2, 'ieee8021': 3.

This attribute specifies the path cost of the designated port of the lan segment connected to the port.

This attribute specifies the contribution of this port, to all the paths to the root bridge that include this port. This attribute pathCostOper will track the value of the attribute pathCostProv when the value of the attribute pathCostMethod is set of off.

This attribute specifies the identifier of the bridge that this port considers to be the designated bridge.

This attribute specifies the port identifier of the port on the designated bridge, attached to the same lan as this port is attached to.

This attribute is indicative of the number of times this bridge port transitioned from the learning state to the forwarding state. This counter wraps around its maximum value of 4294967295. A rapidly increasing value might be indicative of an unstable spanning tree topology.

This attribute is indicative of the number of incoming frames that were discarded because the bridge port was in the blocking state. This counter wraps around its maximum value of 4294967295.

This attribute specifies the bridge identifier of the bridge recorded as the root bridge, in the configuration BPDUs sent out by the designated bridge on the segment to which the port is attached.

This group houses all the statistical attributes applicable to all types of bridge ports and represents the common factor between them. These attributes in part reflect the state of the bridge port.

An entry in the mscVrPpSrtBpStatsTable.

This attribute is indicative of the number of frames that were discarded because the data that was abstracted, from frames coming in through this bridge port, did not conform to the format expected by the bridge logic.This counter wraps around its maximum value of 4294967295.

This attribute is indicative of the number of frames received on this bridge port that used the tinygram compression scheme.

This attribute is indicative of the number of frames transmitted out this bridge port that used the tinygram compression scheme.

This attribute is indicative of the number of frames discarded at the in filter point. This includes a) frames discarded due to application of the filter defined with PCF for the in filter point and b) the frames discarded due to domain based filtering at the in filter point. This counter wraps around its maximum value of 4294967295.

This attribute is indicative of the number of frames discarded at the out filter point. This includes: a) frames discarded due to application of the filter defined with PCF for the out filter point and b) the frames discarded due to domain based filtering at the out filter point. This counter wraps around its maximum value of 4294967295.

This group contains all port specific, provisionable attributes associated with SourceRouteBridge ports.

An entry in the mscVrPpSrtBpSrProvTable.

This attribute specifies the maximum number of hops allowed in Spanning Tree Explore and All Routes Explore frames. This value is one less than the maximum number of route descriptors allowed in a source route frame

This attribute specifies whether or not explore frames received from SourceRouteBridge ports will be sent to the SRTB-8209 translation or the encapsulated SourceRouteBridge logic. This option is used only when both the TbsrBridgePort and the SrtbBridgePort are provisioned and enabled. A value of Xlate implies that the explore frames will be sent to the Srtb translation logic and a value of Encap implies that the frames will be sent to the Encapsulated source route bridging logic. Enumeration: 'xlate': 1, 'encap': 0.

This attribute specifies the identifier for the physical LAN that this port is attached. All SourceRouteBridge ports are assigned to a physical LAN and a logical internal LAN. Current source route bridge implementations limit the lanId to a value in the range 0 to 4095.

This attribute specifies the identifier for the internal logical LAN this port is attached. All SourceRouteBridge ports are assigned to a physical LAN and a logical internal LAN. Current source route bridge implementations limit the lanId to a value in the range 0 to 4095.

This attribute specifies the value that is used to identify this bridge when more than one bridge is used to span the same two LAN segments.

This attribute specifies the maximum frame size (LLC and above) in octets, allowed by this SourceRouteBridge port. This field is used to determine whether a modification of the largest frame field of the routing control field of the routing information field is warranted.

This attribute determines how this bridge port will react when presented with a Spanning Tree Explore frame. If disabled, the Spanning Tree Explore frame is discarded regardless of the value of stpPortState. If the value of this attribute is forced, the Spanning Tree Explore frame is forwarded regardless of the value of stpPortState. autoSpan uses the stpPortState value to decide whether or not Spanning Tree Explore frames should be forwarded out this bridge port. If the port is in the forwarding state, the frame is received and transmitted otherwise the frame is discarded. Enumeration: 'disabled': 2, 'autoSpan': 1, 'forced': 3.

This attribute specifies the number of route descriptors allowed in an All Routes Explore frame received on a SourceRouteBridgePort or SourceRouteTransparentBridgePort. Current source route bridge implementations limit the areRdLimit to a value in the range 0 to 8.

This attribute specifies the number of route descriptors allowed in a Spanning Tree Explore frame received on a SourceRouteBridgePort or SourceRouteTransparentBridgePort. Current source route bridge implementations limit the steRdLimit to a value in the range 0 to 8.

This group contains all port specific statistical attributes associated with SourceRouteBridge ports.

An entry in the mscVrPpSrtBpSrStatsTable.

This attribute specifies the number of specifically routed frames that were received by this bridge port. A specifically routed frame has a route descriptor, constructed by the originating host which details an explicit route to the destination host. This counter will wrap to zero when it exceeds its maximum.

This attribute specifies the number of specifically routed frames that were transmitted from this bridge port. This counter will wrap to zero when it exceeds its maximum.

This attribute specifies the number of All Path Explore frames received on this bridge port. The All Path Explore frames are forwarded to all SourceRouteBridge ports assigned to this bridge regardless of the port's portStpStates. This counter will wrap to zero when it exceeds its maximum.

This attribute specifies the number of All Path Explore frames transmitted on this bridge port. The All Path Explore frames are forwarded to all SourceRouteBridge ports assigned to this bridge regardless of the port's portStpState state. This counter will wrap to zero when it exceeds its maximum.

This attribute specifies the number of Spanning Tree Explore frames received on this bridge port. The Spanning Tree Explore frames are only forwarded through bridge ports whose portStpState has a value of forwarding. This counter will wrap to zero when it exceeds its maximum.

This attribute specifies the number of Spanning Tree Frames transmitted on this bridge port. This counter will wrap to zero when it exceeds its maximum.

This attribute specifies the number of All Routes Explore and Spanning Tree Explore frames that were discarded due to an invalid next segment value in the routing information field. This counter will wrap to zero when it exceeds its maximum.

This attribute specifies the number of frames discarded due to the presence of a duplicate segment identifier in the route descriptor field which may indicate a loop in the network topology. This counter will wrap to zero when it exceeds its maximum.

This attribute specifies the number of All Routes Explore and Spanning Tree Explore frames discarded by this bridge port due to a frame exceeding the maximum size allowed for a route descriptor length. This counter will wrap to zero when it exceeds its maximum.

This attribute specifies the number frames received which contain duplicate LAN IDs or Tree errors. This attribute is helpful in debugging problems in networks which contain older IBM-SR bridges. This counter will wrap to zero when it exceeds its maximum.

This attributes counts the number of All Routes Explore or Spanning Tree Explore frames that were discarded because the last LAN ID in the routing information field did not equal the LAN ID. This counter will wrap to zero when it exceeds its maximum.

This attribute is indicative of the number of explorer frames discarded due to fact that the outbound SourceRouteBridge port was disabled or deleted. This counter will wrap to zero when it exceeds its maximum.

This attribute specifies the number of frames discarded due to receiving a frame with a target LAN ID which did not match the internal LAN ID of the receiving bridge port. This counter will wrap to zero when it exceeds its maximum.

This entry controls the addition and deletion of mscVrPpSrse components.

A single entry in the table represents a single mscVrPpSrse component.

This variable is used as the basis for SNMP naming of mscVrPpSrse components. These components can be added and deleted.

This variable provides the component's string name for use with the ASCII Console Interface

This variable represents the storage type value for the mscVrPpSrse tables.

This variable represents the index for the mscVrPpSrse tables.

This group houses all the provisionable attributes that belong to the this group. This group of attributes is applicable to all types of bridge ports and represent the common factor between them. These attributes influence the working of a bridge port.

An entry in the mscVrPpSrseProvTable.

This attribute specifies the type of translation to be performed on frames carrying IPX packets. Ethernet frames carrying IPX payload could be translated to IEEE 802.3 frames (with the same IPX payload) or vice- versa. The main reason to do so is to allow the bridge unit to consistently forward one type of frames carrying IPX packets. Translations can be turned off altogether in which case the IPX frames will pass through the bridge unit unchanged. Enumeration: 'snap': 3, 'ethernet': 2, 'sap': 4, 'off': 0, 'ieee8023': 1.

This attribute specifies if or not outbound frames carrying IP datagrams should be fragmented to conform to message transfer unit (mtu) sizes dictated by the media. Enumeration: 'on': 1, 'off': 0.

This attribute specifies if the frames should be ordered or not before they are transmitted through a bridge port. If this attribute has a value of ordered the received frames are ordered as in the original message, before they are transmitted out through a bridge port. If it has a value of notOrdered, received then frames pass through the bridge unit in the order they are received. This feature can be used over multiple telecommunication links to increase data flow. Please note that this attribute only affects link protocols and is ineffective with lan media. Enumeration: 'notOrdered': 1, 'ordered': 0.

This attribute is indicative of the state of the MAC address format conversion process for ARP/RARP frames. The MAC addresses may be translated if need be from a canonical format to a non-canonical format, based on the needs of the associated media. If this attribute is set to a value of on then all Mac addresses will converted if need be to suit the format of mac address, the outgoing media will support. If this attribute is set to a value of off no such conversion takes place. Enumeration: 'on': 1, 'off': 0.

This attribute is indicative of the unique number assigned to the bridge port. It is used for SNMP management of this bridge port and in spanning tree as an identifier this bridge port. Notes regarding portNum: Escape routines exist for initializing, copying, and deleting port numbers. This is necessary because SNMP requires a unique port instance identifier. The initPortNum escape routine sets the port number to a value in the range 1-255 for this purpose. The setCopiedPortNum escape routine exists to maintain the uniqueness of the port number in cases when one port is copied to another. When a bridge port is deleted, the releasePortNum escape routine places the port number being released into a pending deletion state. This is because the port number cannot be re-allocated until the port is truely deleted in the current view. This is necessary since there is no guarantee of order when processing changes to multiple protocol ports so without the pending deletion state, the same port number could be temporarily assigned to two ports for a short period of time. The portNum is set as component critical since bridging also uses the port number as a key for indexing into its data structures. If a port is deleted then re-added under the same protocol port, CAS treats the change as a SET to the portNum attribute.

This group houses all the port specific provisionable attributes that belong to the Stp group. The Stp group is applicable to all the bridge ports that participate in the spanning tree protocol. These attributes influence the participation of the bridge port in the spanning tree protocol.

An entry in the mscVrPpSrseStpProvTable.

This attribute defines the current administrative state for this component. enabled indicates that the component is available for operation. disabled indicates the component is unavailable for operation. Enumeration: 'down': 2, 'up': 1.

This attribute specifies whether or not spanning tree protocol state for this bridge port is controlled by the spanning tree protocol. In essence it indicates the participation of this bridge port in the spanning tree protocol, by accepting and acting on received bridge protocol data units and by sending out the same. on signifies that this bridge port's spanning tree port state is controlled by the spanning tree protocol. A value of off signifies that the spanning tree port state of this bridge port is unaffected by the spanning tree protocol. This in effect puts the bridge port out of reach of the spanning tree protocol and in the forwarding state. Care should be taken while assigning a value of off to this attribute, as this might cause network loops. Please do not set this attribute to off unless you are absolutely sure about the effect of such an action on your network topology. Enumeration: 'on': 1, 'off': 0.

This attribute specifies the type of spanning tree protocol the port is participating in. A bridge port could participate in either the ieee8021 spanning tree protocol or the dec spanning tree protocol. If the value of the attribute protocolSpec in the SpanningTreeProtocol component, provisioned under the TransparentBridge component is in conflict with the value of this attribute, the value of the protocolSpec attribute will prevail. Prevailing stp type is reflected in the value of the attribute stpTypeOper. Enumeration: 'dec': 2, 'ieee8021': 3.

This attribute specifies the value for port priority, which is contained in the first octet of the port identifier. Valid values are as follows: 1) 0..255 for stp type DEC and 2) 0..65535 for stp type IEEE.

This attribute specifies the contribution of this port, to all the paths to the root bridge that include this port. Please note that the value of the attribute pathCostMethod is applied only when the value of the attribute pathCostMethod is set to on and is ignored if otherwise.

This attribute specifies the method used by the bridging logic, to calculate the path cost to the bridge considered to be the root bridge in the spanning tree topology. This attribute should be set to off before attempting to provision a value for pathCostProv. Enumeration: 'dec': 2, 'off': 1, 'ieee8021': 3.

This group houses all the provisionable, domain specific attributes for a non-encapsulating bridge port.

An entry in the mscVrPpSrseDIProvTable.

This attribute specifies the domain number associated with this bridge port. Domain numbers are used for confining frames to a domain. Domain based filtering provides a complete segregation of traffic based on domain number associated with frames. There can exist only sixteen domains when a spanning tree is desired specific to each domain. When there is only a single spanning tree spanning all the domains the maximum number of domains possible are 4294967293. This attribute is of no relevance when associated with backbone bridge port. Its value is ignored in such a situation.

This attribute specifies if the domain information should be preserved or embedded in the frame header. This attribute applies only to backbone ports and does not affect the access bridge ports. By setting this attribute to a value of on, domain information could be preserved in frames being tunnelled across the a backbone, so that this information can be deciphered at the other end of the backbone tunnel. This preserves the integrity of the domains thus preventing domain breaches while tunnelling frames across backbone network. If the value of this attribute is set to off then domain information is not preserved in the header of the frames tunnelling through the backbone. This eliminates the overhead incurred to preserve domain information across the backbone while tunnelling frames across it. Preserve domain is relevant when used in conjunction with the following media: FDDI, ATM MPE, Frame Relay and PPP. It is ignored when used with other types of media. Enumeration: 'on': 1, 'off': 0.

This group contains the three OSI State attributes. The descriptions generically indicate what each state attribute implies about the component. Note that not all the values and state combinations described here are supported by every component which uses this group. For component-specific information and the valid state combinations, refer to NTP 241-7001-150, Passport Operations and Maintenance Guide.

An entry in the mscVrPpSrseStateTable.

This attribute indicates the OSI Administrative State of the component. The value locked indicates that the component is administratively prohibited from providing services for its users. A Lock or Lock - force command has been previously issued for this component. When the value is locked, the value of usageState must be idle. The value shuttingDown indicates that the component is administratively permitted to provide service to its existing users only. A Lock command was issued against the component and it is in the process of shutting down. The value unlocked indicates that the component is administratively permitted to provide services for its users. To enter this state, issue an Unlock command to this component. Enumeration: 'locked': 0, 'shuttingDown': 2, 'unlocked': 1.

This attribute indicates the OSI Operational State of the component. The value enabled indicates that the component is available for operation. Note that if adminState is locked, it would still not be providing service. The value disabled indicates that the component is not available for operation. For example, something is wrong with the component itself, or with another component on which this one depends. If the value is disabled, the usageState must be idle. Enumeration: 'disabled': 0, 'enabled': 1.

This attribute indicates the OSI Usage State of the component. The value idle indicates that the component is not currently in use. The value active indicates that the component is in use and has spare capacity to provide for additional users. The value busy indicates that the component is in use and has no spare operating capacity for additional users at this time. Enumeration: 'active': 1, 'idle': 0, 'busy': 2.

This group includes the Operational Status attribute. This attribute defines the current operational state of this component.

An entry in the mscVrPpSrseOperStatusTable.

The current state of the interface. The up state indicates the interface is operational and capable of forwarding packets. The down state indicates the interface is not operational, thus unable to forward packets. testing state indicates that no operational packets can be passed. Enumeration: 'down': 2, 'testing': 3, 'up': 1.

This group houses all the operational attributes belonging to the base group. The base group of attributes is applicable to all types of bridge ports and represent the common factor between them. These attributes in part, reflect the state of a bridge port.

An entry in the mscVrPpSrseOperTable.

The attribute portName is a string of the form 'BridgePortName-i', where BridgePortName is the abbreviation of the corresponding bridge port and i is the instance identifier of the ProtocolPort, the bridge port is provisioned under. For example a TransparentBridgePort provisioned under ProtocolPort/myport would have a name TBP-myport.

This attribute specifies the accumulated up time of this bridge port since the last reset occurred.

This attribute specifies the accumulated down time of this bridge port since the last reset occurred.

This attribute specifies the mode of bridging this port can support. It in turn implies the format of frames, this bridge port can process and forward. Enumeration: 'unknown': 1, 'tb': 2, 'srt': 4, 'sr': 3.

This attribute specifies the bridge port's configuration. It indicates if the bridge port is operating as an access port or as a backbone port. An access bridge port does not encapsulate a MAC frame and does not preserve domain information in the encapsulation, whereas a backbone bridge port encapsulates the MAC frame and optionally preserves domain information in the encapsulated frame.A backbone bridge port is typically used to transport frames across a high bandwidth backbone network to another bridge unit for further processing/forwarding of the frame. Enumeration: 'access': 1, 'backbone': 2.

This attribute specifies the type of bridge port that was provisioned. It takes into consideration the bridgingMode, bridgePortConfig and the media the bridge port is linked to before branding a bridge port. Enumeration: 'fddiBridgePort': 2, 'ethernetBridgePort': 0, 'snaDlrBridgePort': 21, 'clusterTbBridgePort': 18, 'lanEmulationClientEthernet': 22, 'frameRelayBridgePort': 6, 'srtbBridgePort': 15, 'srEncapSrBridgePort': 11, 'tbsrBridgePort': 16, 'unknown': 19, 'vcpBridgePort': 9, 'clusterSrBridgePort': 17, 'srEncapTbBridgePort': 12, 'fddiEncapsulatingBridgePort': 4, 'sourceGateSrBridgePort': 13, 'sourceGateTbBridgePort': 14, 'x25BridgePort': 10, 'smdsBridgePort': 8, 'tokenRingBridgePort': 1, 'tokenBusBridgePort': 3, 'vnsBridgePort': 5, 'atmMpeBridgePort': 20, 'pppBridgePort': 7.

This attribute specifies the index into the Interface Table where in information about the media interface corresponding to the bridge port is maintained.

This attribute is indicative of the number of frames that were discarded because the time taken to process these frames exceeded the transit delay allowed for this bridge unit. This attribute is not supported by bridging and will always have a value of 0.

This attribute is indicative of the number of frames discarded because the size of the out bound frame exceeded the message transfer unit (mtu) allowed for the bridge port. Note that this counter only refers to the outbound frames for this bridge port. This counter wraps around its maximum value of 4294967295. This counter is influenced by the attribute fragmentIp. This counter is incremented when the a frame larger than the mtu allowed is encountered and cannot be fragmented. If this counter is increasing steadily, it might be useful to set the value of the attribute fragmentIp to a value of on.

This group houses all the port specific operational attributes that belong to the Stp group. The Stp group is applicable to all the bridge ports that participate in the spanning tree protocol. These attributes reflect the state of the bridge port's participation in the spanning tree protocol.

An entry in the mscVrPpSrseStpOperTable.

This attribute specifies the spanning tree protocol state of the bridge port. Enumeration: 'listening': 3, 'disabled': 1, 'broken': 6, 'learning': 4, 'forwarding': 5, 'blocking': 2.

This attribute specifies the type of spanning tree protocol the port is participating in. A bridge port could participate in either the ieee8021 spanning tree protocol or the dec spanning tree protocol. Enumeration: 'none': 0, 'dec': 2, 'ieee8021': 3.

This attribute specifies the path cost of the designated port of the lan segment connected to the port.

This attribute specifies the contribution of this port, to all the paths to the root bridge that include this port. This attribute pathCostOper will track the value of the attribute pathCostProv when the value of the attribute pathCostMethod is set of off.

This attribute specifies the identifier of the bridge that this port considers to be the designated bridge.

This attribute specifies the port identifier of the port on the designated bridge, attached to the same lan as this port is attached to.

This attribute is indicative of the number of times this bridge port transitioned from the learning state to the forwarding state. This counter wraps around its maximum value of 4294967295. A rapidly increasing value might be indicative of an unstable spanning tree topology.

This attribute is indicative of the number of incoming frames that were discarded because the bridge port was in the blocking state. This counter wraps around its maximum value of 4294967295.

This attribute specifies the bridge identifier of the bridge recorded as the root bridge, in the configuration BPDUs sent out by the designated bridge on the segment to which the port is attached.

This group houses all the statistical attributes applicable to all types of bridge ports and represents the common factor between them. These attributes in part reflect the state of the bridge port.

An entry in the mscVrPpSrseStatsTable.

This attribute is indicative of the number of frames that were discarded because the data that was abstracted, from frames coming in through this bridge port, did not conform to the format expected by the bridge logic.This counter wraps around its maximum value of 4294967295.

This attribute is indicative of the number of frames received on this bridge port that used the tinygram compression scheme.

This attribute is indicative of the number of frames transmitted out this bridge port that used the tinygram compression scheme.

This attribute is indicative of the number of frames discarded at the in filter point. This includes a) frames discarded due to application of the filter defined with PCF for the in filter point and b) the frames discarded due to domain based filtering at the in filter point. This counter wraps around its maximum value of 4294967295.

This attribute is indicative of the number of frames discarded at the out filter point. This includes: a) frames discarded due to application of the filter defined with PCF for the out filter point and b) the frames discarded due to domain based filtering at the out filter point. This counter wraps around its maximum value of 4294967295.

This group contains all port specific, provisionable attributes associated with SourceRouteBridge ports.

An entry in the mscVrPpSrseSrProvTable.

This attribute specifies the maximum number of hops allowed in Spanning Tree Explore and All Routes Explore frames. This value is one less than the maximum number of route descriptors allowed in a source route frame

This attribute specifies whether or not explore frames received from SourceRouteBridge ports will be sent to the SRTB-8209 translation or the encapsulated SourceRouteBridge logic. This option is used only when both the TbsrBridgePort and the SrtbBridgePort are provisioned and enabled. A value of Xlate implies that the explore frames will be sent to the Srtb translation logic and a value of Encap implies that the frames will be sent to the Encapsulated source route bridging logic. Enumeration: 'xlate': 1, 'encap': 0.

This attribute specifies the identifier for the physical LAN that this port is attached. All SourceRouteBridge ports are assigned to a physical LAN and a logical internal LAN. Current source route bridge implementations limit the lanId to a value in the range 0 to 4095.

This attribute specifies the identifier for the internal logical LAN this port is attached. All SourceRouteBridge ports are assigned to a physical LAN and a logical internal LAN. Current source route bridge implementations limit the lanId to a value in the range 0 to 4095.

This attribute specifies the value that is used to identify this bridge when more than one bridge is used to span the same two LAN segments.

This attribute specifies the maximum frame size (LLC and above) in octets, allowed by this SourceRouteBridge port. This field is used to determine whether a modification of the largest frame field of the routing control field of the routing information field is warranted.

This attribute determines how this bridge port will react when presented with a Spanning Tree Explore frame. If disabled, the Spanning Tree Explore frame is discarded regardless of the value of stpPortState. If the value of this attribute is forced, the Spanning Tree Explore frame is forwarded regardless of the value of stpPortState. autoSpan uses the stpPortState value to decide whether or not Spanning Tree Explore frames should be forwarded out this bridge port. If the port is in the forwarding state, the frame is received and transmitted otherwise the frame is discarded. Enumeration: 'disabled': 2, 'autoSpan': 1, 'forced': 3.

This attribute specifies the number of route descriptors allowed in an All Routes Explore frame received on a SourceRouteBridgePort or SourceRouteTransparentBridgePort. Current source route bridge implementations limit the areRdLimit to a value in the range 0 to 8.

This attribute specifies the number of route descriptors allowed in a Spanning Tree Explore frame received on a SourceRouteBridgePort or SourceRouteTransparentBridgePort. Current source route bridge implementations limit the steRdLimit to a value in the range 0 to 8.

This group contains all port specific statistical attributes associated with SourceRouteBridge ports.

An entry in the mscVrPpSrseSrStatsTable.

This attribute specifies the number of specifically routed frames that were received by this bridge port. A specifically routed frame has a route descriptor, constructed by the originating host which details an explicit route to the destination host. This counter will wrap to zero when it exceeds its maximum.

This attribute specifies the number of specifically routed frames that were transmitted from this bridge port. This counter will wrap to zero when it exceeds its maximum.

This attribute specifies the number of All Path Explore frames received on this bridge port. The All Path Explore frames are forwarded to all SourceRouteBridge ports assigned to this bridge regardless of the port's portStpStates. This counter will wrap to zero when it exceeds its maximum.

This attribute specifies the number of All Path Explore frames transmitted on this bridge port. The All Path Explore frames are forwarded to all SourceRouteBridge ports assigned to this bridge regardless of the port's portStpState state. This counter will wrap to zero when it exceeds its maximum.

This attribute specifies the number of Spanning Tree Explore frames received on this bridge port. The Spanning Tree Explore frames are only forwarded through bridge ports whose portStpState has a value of forwarding. This counter will wrap to zero when it exceeds its maximum.

This attribute specifies the number of Spanning Tree Frames transmitted on this bridge port. This counter will wrap to zero when it exceeds its maximum.

This attribute specifies the number of All Routes Explore and Spanning Tree Explore frames that were discarded due to an invalid next segment value in the routing information field. This counter will wrap to zero when it exceeds its maximum.

This attribute specifies the number of frames discarded due to the presence of a duplicate segment identifier in the route descriptor field which may indicate a loop in the network topology. This counter will wrap to zero when it exceeds its maximum.

This attribute specifies the number of All Routes Explore and Spanning Tree Explore frames discarded by this bridge port due to a frame exceeding the maximum size allowed for a route descriptor length. This counter will wrap to zero when it exceeds its maximum.

This attribute specifies the number frames received which contain duplicate LAN IDs or Tree errors. This attribute is helpful in debugging problems in networks which contain older IBM-SR bridges. This counter will wrap to zero when it exceeds its maximum.

This attributes counts the number of All Routes Explore or Spanning Tree Explore frames that were discarded because the last LAN ID in the routing information field did not equal the LAN ID. This counter will wrap to zero when it exceeds its maximum.

This attribute is indicative of the number of explorer frames discarded due to fact that the outbound SourceRouteBridge port was disabled or deleted. This counter will wrap to zero when it exceeds its maximum.

This attribute specifies the number of frames discarded due to receiving a frame with a target LAN ID which did not match the internal LAN ID of the receiving bridge port. This counter will wrap to zero when it exceeds its maximum.

This entry controls the addition and deletion of mscVrPpTbse components.

A single entry in the table represents a single mscVrPpTbse component.

This variable is used as the basis for SNMP naming of mscVrPpTbse components. These components can be added and deleted.

This variable provides the component's string name for use with the ASCII Console Interface

This variable represents the storage type value for the mscVrPpTbse tables.

This variable represents the index for the mscVrPpTbse tables.

This group houses all the provisionable attributes that belong to the this group. This group of attributes is applicable to all types of bridge ports and represent the common factor between them. These attributes influence the working of a bridge port.

An entry in the mscVrPpTbseProvTable.

This attribute specifies the type of translation to be performed on frames carrying IPX packets. Ethernet frames carrying IPX payload could be translated to IEEE 802.3 frames (with the same IPX payload) or vice- versa. The main reason to do so is to allow the bridge unit to consistently forward one type of frames carrying IPX packets. Translations can be turned off altogether in which case the IPX frames will pass through the bridge unit unchanged. Enumeration: 'snap': 3, 'ethernet': 2, 'sap': 4, 'off': 0, 'ieee8023': 1.

This attribute specifies if or not outbound frames carrying IP datagrams should be fragmented to conform to message transfer unit (mtu) sizes dictated by the media. Enumeration: 'on': 1, 'off': 0.

This attribute specifies if the frames should be ordered or not before they are transmitted through a bridge port. If this attribute has a value of ordered the received frames are ordered as in the original message, before they are transmitted out through a bridge port. If it has a value of notOrdered, received then frames pass through the bridge unit in the order they are received. This feature can be used over multiple telecommunication links to increase data flow. Please note that this attribute only affects link protocols and is ineffective with lan media. Enumeration: 'notOrdered': 1, 'ordered': 0.

This attribute is indicative of the state of the MAC address format conversion process for ARP/RARP frames. The MAC addresses may be translated if need be from a canonical format to a non-canonical format, based on the needs of the associated media. If this attribute is set to a value of on then all Mac addresses will converted if need be to suit the format of mac address, the outgoing media will support. If this attribute is set to a value of off no such conversion takes place. Enumeration: 'on': 1, 'off': 0.

This attribute is indicative of the unique number assigned to the bridge port. It is used for SNMP management of this bridge port and in spanning tree as an identifier this bridge port. Notes regarding portNum: Escape routines exist for initializing, copying, and deleting port numbers. This is necessary because SNMP requires a unique port instance identifier. The initPortNum escape routine sets the port number to a value in the range 1-255 for this purpose. The setCopiedPortNum escape routine exists to maintain the uniqueness of the port number in cases when one port is copied to another. When a bridge port is deleted, the releasePortNum escape routine places the port number being released into a pending deletion state. This is because the port number cannot be re-allocated until the port is truely deleted in the current view. This is necessary since there is no guarantee of order when processing changes to multiple protocol ports so without the pending deletion state, the same port number could be temporarily assigned to two ports for a short period of time. The portNum is set as component critical since bridging also uses the port number as a key for indexing into its data structures. If a port is deleted then re-added under the same protocol port, CAS treats the change as a SET to the portNum attribute.

This group houses all the port specific provisionable attributes that belong to the Tb group. The Tb group is only applicable bridge port types that operate in the TB mode. These attributes in part influence the working of a bridge port operating in the TB mode.

An entry in the mscVrPpTbseTbProvTable.

This attribute specifies whether the port secure feature is enabled. The secure feature, if enabled causes the following things to happen: a) disallows dynamic learning, b) disallows frames to be forwarded that do not satisfy the following condition: the mac address of the source should be found in the forwarding table and the destination mac address of the frame should also be found in the forwarding table. In addition to this, the port the frame was received on should figure as the in port, given the destination mac address found in the frame. c) disallows frames to be forwarded if the allowed to go port map for the destination mac address is empty. This feature in effect allows the user to choose the hosts that can generate traffic and the hosts that can receive traffic through this bridge unit. Enumeration: 'disabled': 0, 'enabled': 1.

This group houses all the port specific provisionable attributes that belong to the Stp group. The Stp group is applicable to all the bridge ports that participate in the spanning tree protocol. These attributes influence the participation of the bridge port in the spanning tree protocol.

An entry in the mscVrPpTbseStpProvTable.

This attribute defines the current administrative state for this component. enabled indicates that the component is available for operation. disabled indicates the component is unavailable for operation. Enumeration: 'down': 2, 'up': 1.

This attribute specifies whether or not spanning tree protocol state for this bridge port is controlled by the spanning tree protocol. In essence it indicates the participation of this bridge port in the spanning tree protocol, by accepting and acting on received bridge protocol data units and by sending out the same. on signifies that this bridge port's spanning tree port state is controlled by the spanning tree protocol. A value of off signifies that the spanning tree port state of this bridge port is unaffected by the spanning tree protocol. This in effect puts the bridge port out of reach of the spanning tree protocol and in the forwarding state. Care should be taken while assigning a value of off to this attribute, as this might cause network loops. Please do not set this attribute to off unless you are absolutely sure about the effect of such an action on your network topology. Enumeration: 'on': 1, 'off': 0.

This attribute specifies the type of spanning tree protocol the port is participating in. A bridge port could participate in either the ieee8021 spanning tree protocol or the dec spanning tree protocol. If the value of the attribute protocolSpec in the SpanningTreeProtocol component, provisioned under the TransparentBridge component is in conflict with the value of this attribute, the value of the protocolSpec attribute will prevail. Prevailing stp type is reflected in the value of the attribute stpTypeOper. Enumeration: 'dec': 2, 'ieee8021': 3.

This attribute specifies the value for port priority, which is contained in the first octet of the port identifier. Valid values are as follows: 1) 0..255 for stp type DEC and 2) 0..65535 for stp type IEEE.

This attribute specifies the contribution of this port, to all the paths to the root bridge that include this port. Please note that the value of the attribute pathCostMethod is applied only when the value of the attribute pathCostMethod is set to on and is ignored if otherwise.

This attribute specifies the method used by the bridging logic, to calculate the path cost to the bridge considered to be the root bridge in the spanning tree topology. This attribute should be set to off before attempting to provision a value for pathCostProv. Enumeration: 'dec': 2, 'off': 1, 'ieee8021': 3.

This group houses all the provisionable, domain specific attributes for a non-encapsulating bridge port.

An entry in the mscVrPpTbseDIProvTable.

This attribute specifies the domain number associated with this bridge port. Domain numbers are used for confining frames to a domain. Domain based filtering provides a complete segregation of traffic based on domain number associated with frames. There can exist only sixteen domains when a spanning tree is desired specific to each domain. When there is only a single spanning tree spanning all the domains the maximum number of domains possible are 4294967293. This attribute is of no relevance when associated with backbone bridge port. Its value is ignored in such a situation.

This attribute specifies if the domain information should be preserved or embedded in the frame header. This attribute applies only to backbone ports and does not affect the access bridge ports. By setting this attribute to a value of on, domain information could be preserved in frames being tunnelled across the a backbone, so that this information can be deciphered at the other end of the backbone tunnel. This preserves the integrity of the domains thus preventing domain breaches while tunnelling frames across backbone network. If the value of this attribute is set to off then domain information is not preserved in the header of the frames tunnelling through the backbone. This eliminates the overhead incurred to preserve domain information across the backbone while tunnelling frames across it. Preserve domain is relevant when used in conjunction with the following media: FDDI, ATM MPE, Frame Relay and PPP. It is ignored when used with other types of media. Enumeration: 'on': 1, 'off': 0.

This group contains the three OSI State attributes. The descriptions generically indicate what each state attribute implies about the component. Note that not all the values and state combinations described here are supported by every component which uses this group. For component-specific information and the valid state combinations, refer to NTP 241-7001-150, Passport Operations and Maintenance Guide.

An entry in the mscVrPpTbseStateTable.

This attribute indicates the OSI Administrative State of the component. The value locked indicates that the component is administratively prohibited from providing services for its users. A Lock or Lock - force command has been previously issued for this component. When the value is locked, the value of usageState must be idle. The value shuttingDown indicates that the component is administratively permitted to provide service to its existing users only. A Lock command was issued against the component and it is in the process of shutting down. The value unlocked indicates that the component is administratively permitted to provide services for its users. To enter this state, issue an Unlock command to this component. Enumeration: 'locked': 0, 'shuttingDown': 2, 'unlocked': 1.

This attribute indicates the OSI Operational State of the component. The value enabled indicates that the component is available for operation. Note that if adminState is locked, it would still not be providing service. The value disabled indicates that the component is not available for operation. For example, something is wrong with the component itself, or with another component on which this one depends. If the value is disabled, the usageState must be idle. Enumeration: 'disabled': 0, 'enabled': 1.

This attribute indicates the OSI Usage State of the component. The value idle indicates that the component is not currently in use. The value active indicates that the component is in use and has spare capacity to provide for additional users. The value busy indicates that the component is in use and has no spare operating capacity for additional users at this time. Enumeration: 'active': 1, 'idle': 0, 'busy': 2.

This group includes the Operational Status attribute. This attribute defines the current operational state of this component.

An entry in the mscVrPpTbseOperStatusTable.

The current state of the interface. The up state indicates the interface is operational and capable of forwarding packets. The down state indicates the interface is not operational, thus unable to forward packets. testing state indicates that no operational packets can be passed. Enumeration: 'down': 2, 'testing': 3, 'up': 1.

This group houses all the operational attributes belonging to the base group. The base group of attributes is applicable to all types of bridge ports and represent the common factor between them. These attributes in part, reflect the state of a bridge port.

An entry in the mscVrPpTbseOperTable.

The attribute portName is a string of the form 'BridgePortName-i', where BridgePortName is the abbreviation of the corresponding bridge port and i is the instance identifier of the ProtocolPort, the bridge port is provisioned under. For example a TransparentBridgePort provisioned under ProtocolPort/myport would have a name TBP-myport.

This attribute specifies the accumulated up time of this bridge port since the last reset occurred.

This attribute specifies the accumulated down time of this bridge port since the last reset occurred.

This attribute specifies the mode of bridging this port can support. It in turn implies the format of frames, this bridge port can process and forward. Enumeration: 'unknown': 1, 'tb': 2, 'srt': 4, 'sr': 3.

This attribute specifies the bridge port's configuration. It indicates if the bridge port is operating as an access port or as a backbone port. An access bridge port does not encapsulate a MAC frame and does not preserve domain information in the encapsulation, whereas a backbone bridge port encapsulates the MAC frame and optionally preserves domain information in the encapsulated frame.A backbone bridge port is typically used to transport frames across a high bandwidth backbone network to another bridge unit for further processing/forwarding of the frame. Enumeration: 'access': 1, 'backbone': 2.

This attribute specifies the type of bridge port that was provisioned. It takes into consideration the bridgingMode, bridgePortConfig and the media the bridge port is linked to before branding a bridge port. Enumeration: 'fddiBridgePort': 2, 'ethernetBridgePort': 0, 'snaDlrBridgePort': 21, 'clusterTbBridgePort': 18, 'lanEmulationClientEthernet': 22, 'frameRelayBridgePort': 6, 'srtbBridgePort': 15, 'srEncapSrBridgePort': 11, 'tbsrBridgePort': 16, 'unknown': 19, 'vcpBridgePort': 9, 'clusterSrBridgePort': 17, 'srEncapTbBridgePort': 12, 'fddiEncapsulatingBridgePort': 4, 'sourceGateSrBridgePort': 13, 'sourceGateTbBridgePort': 14, 'x25BridgePort': 10, 'smdsBridgePort': 8, 'tokenRingBridgePort': 1, 'tokenBusBridgePort': 3, 'vnsBridgePort': 5, 'atmMpeBridgePort': 20, 'pppBridgePort': 7.

This attribute specifies the index into the Interface Table where in information about the media interface corresponding to the bridge port is maintained.

This attribute is indicative of the number of frames that were discarded because the time taken to process these frames exceeded the transit delay allowed for this bridge unit. This attribute is not supported by bridging and will always have a value of 0.

This attribute is indicative of the number of frames discarded because the size of the out bound frame exceeded the message transfer unit (mtu) allowed for the bridge port. Note that this counter only refers to the outbound frames for this bridge port. This counter wraps around its maximum value of 4294967295. This counter is influenced by the attribute fragmentIp. This counter is incremented when the a frame larger than the mtu allowed is encountered and cannot be fragmented. If this counter is increasing steadily, it might be useful to set the value of the attribute fragmentIp to a value of on.

This group houses all the port specific operational attributes that belong to the Tb group. This group also houses all the port specific statistical attributes that belong to the Tb group. The Tb group is only applicable bridge port types that operate in the TB mode. These attributes reflect the state of a bridge port operating in the TB mode

An entry in the mscVrPpTbseTbOperTable.

This attribute specifies the maximum size of the information field in a TB frame. This excludes the header field.

This attribute is indicative of the number of incoming frames that were discarded because: a) the value of the secureOption attribute was set to on and b) it is not allowed to receive frames originating from the mac address found in the source address field of the frame (source mac address look up in the forwarding table failed.) on this bridge port. c) for the destination mac address found in the frame, the port the frame was received on does not appear as in port in the corresponding static table entry. Permission to receive frames from a mac address is granted via the static table entries. This attribute, badVerifyDiscards, is directly influenced by: 1. secureOption and 2. the static table entries. This counter wraps around its maximum value of 4294967295.

This attribute is indicative of the number frames discarded because the MAC address found in the destination field did not match the local MAC address of the bridge port. This counter is only applicable for the protocols that are being routed currently.This counter wraps around its maximum value of 4294967295.

This attribute is indicative of the number of frames that were discarded because of the following two reasons: a) there was no entry for the 'allowed to go' field in the static table entry, where the input port is this bridge port. b) for spanning tree bpdus that are locally processed. This counter wraps around its maximum value of 4294967295. It might prove useful to check the static table entry corresponding to the bridge port in question, if this counter consistently displays a high value. Ideally this counter should be as low as possible.

This attribute is indicative of the number of incoming frames that a) were discarded because of the fact that the bridge port, the frame is to go out of matches the bridge port it came in from or b) if the stp port state of the out port is not forwarding. This counter wraps around its maximum value of 4294967295.

This attribute is indicative of the number of frames that were discarded while this bridge port was in a state other than the forwarding state. While in learning state the frame is discarded after the information from its header is learnt. This counter wraps around its maximum value of 4294967295.

This attribute is indicative of the number of frames that were received by this bridge port and were discarded by the forwarding process. This includes frames that could have been discarded due to filtering. A repidly increasing value for this attribute could indicate a shrtage of resource in terms of memory needed to process the incoming frames. More memory can be provisioned through the VirtualRouter's memory manager.

This attribute is indicative of the number of frames that have been received by this port from its segment. Note that a frame received on this bridge port is counted if and only if it can be processed by the bridge logic contained in this bridge unit, a protocol that can be processed by the bridge logic. This counter wraps around its maximum value of 4294967295.

This attribute is indicative of the number of frames that have been transmitted out this bridge port. Note that frame transmitted out this bridge port is counted if and only if it is for a protocol being processed by the bridge unit. This also includes management frames.This counter wraps around its maximum value of 4294967295.

This group houses all the port specific operational attributes that belong to the Stp group. The Stp group is applicable to all the bridge ports that participate in the spanning tree protocol. These attributes reflect the state of the bridge port's participation in the spanning tree protocol.

An entry in the mscVrPpTbseStpOperTable.

This attribute specifies the spanning tree protocol state of the bridge port. Enumeration: 'listening': 3, 'disabled': 1, 'broken': 6, 'learning': 4, 'forwarding': 5, 'blocking': 2.

This attribute specifies the type of spanning tree protocol the port is participating in. A bridge port could participate in either the ieee8021 spanning tree protocol or the dec spanning tree protocol. Enumeration: 'none': 0, 'dec': 2, 'ieee8021': 3.

This attribute specifies the path cost of the designated port of the lan segment connected to the port.

This attribute specifies the contribution of this port, to all the paths to the root bridge that include this port. This attribute pathCostOper will track the value of the attribute pathCostProv when the value of the attribute pathCostMethod is set of off.

This attribute specifies the identifier of the bridge that this port considers to be the designated bridge.

This attribute specifies the port identifier of the port on the designated bridge, attached to the same lan as this port is attached to.

This attribute is indicative of the number of times this bridge port transitioned from the learning state to the forwarding state. This counter wraps around its maximum value of 4294967295. A rapidly increasing value might be indicative of an unstable spanning tree topology.

This attribute is indicative of the number of incoming frames that were discarded because the bridge port was in the blocking state. This counter wraps around its maximum value of 4294967295.

This attribute specifies the bridge identifier of the bridge recorded as the root bridge, in the configuration BPDUs sent out by the designated bridge on the segment to which the port is attached.

This group houses all the statistical attributes applicable to all types of bridge ports and represents the common factor between them. These attributes in part reflect the state of the bridge port.

An entry in the mscVrPpTbseStatsTable.

This attribute is indicative of the number of frames that were discarded because the data that was abstracted, from frames coming in through this bridge port, did not conform to the format expected by the bridge logic.This counter wraps around its maximum value of 4294967295.

This attribute is indicative of the number of frames received on this bridge port that used the tinygram compression scheme.

This attribute is indicative of the number of frames transmitted out this bridge port that used the tinygram compression scheme.

This attribute is indicative of the number of frames discarded at the in filter point. This includes a) frames discarded due to application of the filter defined with PCF for the in filter point and b) the frames discarded due to domain based filtering at the in filter point. This counter wraps around its maximum value of 4294967295.

This attribute is indicative of the number of frames discarded at the out filter point. This includes: a) frames discarded due to application of the filter defined with PCF for the out filter point and b) the frames discarded due to domain based filtering at the out filter point. This counter wraps around its maximum value of 4294967295.

This entry controls the addition and deletion of mscVrPpSrsg components.

A single entry in the table represents a single mscVrPpSrsg component.

This variable is used as the basis for SNMP naming of mscVrPpSrsg components. These components can be added and deleted.

This variable provides the component's string name for use with the ASCII Console Interface

This variable represents the storage type value for the mscVrPpSrsg tables.

This variable represents the index for the mscVrPpSrsg tables.

This group houses all the provisionable attributes that belong to the this group. This group of attributes is applicable to all types of bridge ports and represent the common factor between them. These attributes influence the working of a bridge port.

An entry in the mscVrPpSrsgProvTable.

This attribute specifies the type of translation to be performed on frames carrying IPX packets. Ethernet frames carrying IPX payload could be translated to IEEE 802.3 frames (with the same IPX payload) or vice- versa. The main reason to do so is to allow the bridge unit to consistently forward one type of frames carrying IPX packets. Translations can be turned off altogether in which case the IPX frames will pass through the bridge unit unchanged. Enumeration: 'snap': 3, 'ethernet': 2, 'sap': 4, 'off': 0, 'ieee8023': 1.

This attribute specifies if or not outbound frames carrying IP datagrams should be fragmented to conform to message transfer unit (mtu) sizes dictated by the media. Enumeration: 'on': 1, 'off': 0.

This attribute specifies if the frames should be ordered or not before they are transmitted through a bridge port. If this attribute has a value of ordered the received frames are ordered as in the original message, before they are transmitted out through a bridge port. If it has a value of notOrdered, received then frames pass through the bridge unit in the order they are received. This feature can be used over multiple telecommunication links to increase data flow. Please note that this attribute only affects link protocols and is ineffective with lan media. Enumeration: 'notOrdered': 1, 'ordered': 0.

This attribute is indicative of the state of the MAC address format conversion process for ARP/RARP frames. The MAC addresses may be translated if need be from a canonical format to a non-canonical format, based on the needs of the associated media. If this attribute is set to a value of on then all Mac addresses will converted if need be to suit the format of mac address, the outgoing media will support. If this attribute is set to a value of off no such conversion takes place. Enumeration: 'on': 1, 'off': 0.

This attribute is indicative of the unique number assigned to the bridge port. It is used for SNMP management of this bridge port and in spanning tree as an identifier this bridge port. Notes regarding portNum: Escape routines exist for initializing, copying, and deleting port numbers. This is necessary because SNMP requires a unique port instance identifier. The initPortNum escape routine sets the port number to a value in the range 1-255 for this purpose. The setCopiedPortNum escape routine exists to maintain the uniqueness of the port number in cases when one port is copied to another. When a bridge port is deleted, the releasePortNum escape routine places the port number being released into a pending deletion state. This is because the port number cannot be re-allocated until the port is truely deleted in the current view. This is necessary since there is no guarantee of order when processing changes to multiple protocol ports so without the pending deletion state, the same port number could be temporarily assigned to two ports for a short period of time. The portNum is set as component critical since bridging also uses the port number as a key for indexing into its data structures. If a port is deleted then re-added under the same protocol port, CAS treats the change as a SET to the portNum attribute.

This group houses all the port specific provisionable attributes that belong to the Stp group. The Stp group is applicable to all the bridge ports that participate in the spanning tree protocol. These attributes influence the participation of the bridge port in the spanning tree protocol.

An entry in the mscVrPpSrsgStpProvTable.

This attribute defines the current administrative state for this component. enabled indicates that the component is available for operation. disabled indicates the component is unavailable for operation. Enumeration: 'down': 2, 'up': 1.

This attribute specifies whether or not spanning tree protocol state for this bridge port is controlled by the spanning tree protocol. In essence it indicates the participation of this bridge port in the spanning tree protocol, by accepting and acting on received bridge protocol data units and by sending out the same. on signifies that this bridge port's spanning tree port state is controlled by the spanning tree protocol. A value of off signifies that the spanning tree port state of this bridge port is unaffected by the spanning tree protocol. This in effect puts the bridge port out of reach of the spanning tree protocol and in the forwarding state. Care should be taken while assigning a value of off to this attribute, as this might cause network loops. Please do not set this attribute to off unless you are absolutely sure about the effect of such an action on your network topology. Enumeration: 'on': 1, 'off': 0.

This attribute specifies the type of spanning tree protocol the port is participating in. A bridge port could participate in either the ieee8021 spanning tree protocol or the dec spanning tree protocol. If the value of the attribute protocolSpec in the SpanningTreeProtocol component, provisioned under the TransparentBridge component is in conflict with the value of this attribute, the value of the protocolSpec attribute will prevail. Prevailing stp type is reflected in the value of the attribute stpTypeOper. Enumeration: 'dec': 2, 'ieee8021': 3.

This attribute specifies the value for port priority, which is contained in the first octet of the port identifier. Valid values are as follows: 1) 0..255 for stp type DEC and 2) 0..65535 for stp type IEEE.

This attribute specifies the contribution of this port, to all the paths to the root bridge that include this port. Please note that the value of the attribute pathCostMethod is applied only when the value of the attribute pathCostMethod is set to on and is ignored if otherwise.

This attribute specifies the method used by the bridging logic, to calculate the path cost to the bridge considered to be the root bridge in the spanning tree topology. This attribute should be set to off before attempting to provision a value for pathCostProv. Enumeration: 'dec': 2, 'off': 1, 'ieee8021': 3.

This group houses all the provisionable, domain specific attributes for a non-encapsulating bridge port.

An entry in the mscVrPpSrsgDIProvTable.

This attribute specifies the domain number associated with this bridge port. Domain numbers are used for confining frames to a domain. Domain based filtering provides a complete segregation of traffic based on domain number associated with frames. There can exist only sixteen domains when a spanning tree is desired specific to each domain. When there is only a single spanning tree spanning all the domains the maximum number of domains possible are 4294967293. This attribute is of no relevance when associated with backbone bridge port. Its value is ignored in such a situation.

This attribute specifies if the domain information should be preserved or embedded in the frame header. This attribute applies only to backbone ports and does not affect the access bridge ports. By setting this attribute to a value of on, domain information could be preserved in frames being tunnelled across the a backbone, so that this information can be deciphered at the other end of the backbone tunnel. This preserves the integrity of the domains thus preventing domain breaches while tunnelling frames across backbone network. If the value of this attribute is set to off then domain information is not preserved in the header of the frames tunnelling through the backbone. This eliminates the overhead incurred to preserve domain information across the backbone while tunnelling frames across it. Preserve domain is relevant when used in conjunction with the following media: FDDI, ATM MPE, Frame Relay and PPP. It is ignored when used with other types of media. Enumeration: 'on': 1, 'off': 0.

This group contains the three OSI State attributes. The descriptions generically indicate what each state attribute implies about the component. Note that not all the values and state combinations described here are supported by every component which uses this group. For component-specific information and the valid state combinations, refer to NTP 241-7001-150, Passport Operations and Maintenance Guide.

An entry in the mscVrPpSrsgStateTable.

This attribute indicates the OSI Administrative State of the component. The value locked indicates that the component is administratively prohibited from providing services for its users. A Lock or Lock - force command has been previously issued for this component. When the value is locked, the value of usageState must be idle. The value shuttingDown indicates that the component is administratively permitted to provide service to its existing users only. A Lock command was issued against the component and it is in the process of shutting down. The value unlocked indicates that the component is administratively permitted to provide services for its users. To enter this state, issue an Unlock command to this component. Enumeration: 'locked': 0, 'shuttingDown': 2, 'unlocked': 1.

This attribute indicates the OSI Operational State of the component. The value enabled indicates that the component is available for operation. Note that if adminState is locked, it would still not be providing service. The value disabled indicates that the component is not available for operation. For example, something is wrong with the component itself, or with another component on which this one depends. If the value is disabled, the usageState must be idle. Enumeration: 'disabled': 0, 'enabled': 1.

This attribute indicates the OSI Usage State of the component. The value idle indicates that the component is not currently in use. The value active indicates that the component is in use and has spare capacity to provide for additional users. The value busy indicates that the component is in use and has no spare operating capacity for additional users at this time. Enumeration: 'active': 1, 'idle': 0, 'busy': 2.

This group includes the Operational Status attribute. This attribute defines the current operational state of this component.

An entry in the mscVrPpSrsgOperStatusTable.

The current state of the interface. The up state indicates the interface is operational and capable of forwarding packets. The down state indicates the interface is not operational, thus unable to forward packets. testing state indicates that no operational packets can be passed. Enumeration: 'down': 2, 'testing': 3, 'up': 1.

This group houses all the operational attributes belonging to the base group. The base group of attributes is applicable to all types of bridge ports and represent the common factor between them. These attributes in part, reflect the state of a bridge port.

An entry in the mscVrPpSrsgOperTable.

The attribute portName is a string of the form 'BridgePortName-i', where BridgePortName is the abbreviation of the corresponding bridge port and i is the instance identifier of the ProtocolPort, the bridge port is provisioned under. For example a TransparentBridgePort provisioned under ProtocolPort/myport would have a name TBP-myport.

This attribute specifies the accumulated up time of this bridge port since the last reset occurred.

This attribute specifies the accumulated down time of this bridge port since the last reset occurred.

This attribute specifies the mode of bridging this port can support. It in turn implies the format of frames, this bridge port can process and forward. Enumeration: 'unknown': 1, 'tb': 2, 'srt': 4, 'sr': 3.

This attribute specifies the bridge port's configuration. It indicates if the bridge port is operating as an access port or as a backbone port. An access bridge port does not encapsulate a MAC frame and does not preserve domain information in the encapsulation, whereas a backbone bridge port encapsulates the MAC frame and optionally preserves domain information in the encapsulated frame.A backbone bridge port is typically used to transport frames across a high bandwidth backbone network to another bridge unit for further processing/forwarding of the frame. Enumeration: 'access': 1, 'backbone': 2.

This attribute specifies the type of bridge port that was provisioned. It takes into consideration the bridgingMode, bridgePortConfig and the media the bridge port is linked to before branding a bridge port. Enumeration: 'fddiBridgePort': 2, 'ethernetBridgePort': 0, 'snaDlrBridgePort': 21, 'clusterTbBridgePort': 18, 'lanEmulationClientEthernet': 22, 'frameRelayBridgePort': 6, 'srtbBridgePort': 15, 'srEncapSrBridgePort': 11, 'tbsrBridgePort': 16, 'unknown': 19, 'vcpBridgePort': 9, 'clusterSrBridgePort': 17, 'srEncapTbBridgePort': 12, 'fddiEncapsulatingBridgePort': 4, 'sourceGateSrBridgePort': 13, 'sourceGateTbBridgePort': 14, 'x25BridgePort': 10, 'smdsBridgePort': 8, 'tokenRingBridgePort': 1, 'tokenBusBridgePort': 3, 'vnsBridgePort': 5, 'atmMpeBridgePort': 20, 'pppBridgePort': 7.

This attribute specifies the index into the Interface Table where in information about the media interface corresponding to the bridge port is maintained.

This attribute is indicative of the number of frames that were discarded because the time taken to process these frames exceeded the transit delay allowed for this bridge unit. This attribute is not supported by bridging and will always have a value of 0.

This attribute is indicative of the number of frames discarded because the size of the out bound frame exceeded the message transfer unit (mtu) allowed for the bridge port. Note that this counter only refers to the outbound frames for this bridge port. This counter wraps around its maximum value of 4294967295. This counter is influenced by the attribute fragmentIp. This counter is incremented when the a frame larger than the mtu allowed is encountered and cannot be fragmented. If this counter is increasing steadily, it might be useful to set the value of the attribute fragmentIp to a value of on.

This group houses all the port specific operational attributes that belong to the Stp group. The Stp group is applicable to all the bridge ports that participate in the spanning tree protocol. These attributes reflect the state of the bridge port's participation in the spanning tree protocol.

An entry in the mscVrPpSrsgStpOperTable.

This attribute specifies the spanning tree protocol state of the bridge port. Enumeration: 'listening': 3, 'disabled': 1, 'broken': 6, 'learning': 4, 'forwarding': 5, 'blocking': 2.

This attribute specifies the type of spanning tree protocol the port is participating in. A bridge port could participate in either the ieee8021 spanning tree protocol or the dec spanning tree protocol. Enumeration: 'none': 0, 'dec': 2, 'ieee8021': 3.

This attribute specifies the path cost of the designated port of the lan segment connected to the port.

This attribute specifies the contribution of this port, to all the paths to the root bridge that include this port. This attribute pathCostOper will track the value of the attribute pathCostProv when the value of the attribute pathCostMethod is set of off.

This attribute specifies the identifier of the bridge that this port considers to be the designated bridge.

This attribute specifies the port identifier of the port on the designated bridge, attached to the same lan as this port is attached to.

This attribute is indicative of the number of times this bridge port transitioned from the learning state to the forwarding state. This counter wraps around its maximum value of 4294967295. A rapidly increasing value might be indicative of an unstable spanning tree topology.

This attribute is indicative of the number of incoming frames that were discarded because the bridge port was in the blocking state. This counter wraps around its maximum value of 4294967295.

This attribute specifies the bridge identifier of the bridge recorded as the root bridge, in the configuration BPDUs sent out by the designated bridge on the segment to which the port is attached.

This group houses all the statistical attributes applicable to all types of bridge ports and represents the common factor between them. These attributes in part reflect the state of the bridge port.

An entry in the mscVrPpSrsgStatsTable.

This attribute is indicative of the number of frames that were discarded because the data that was abstracted, from frames coming in through this bridge port, did not conform to the format expected by the bridge logic.This counter wraps around its maximum value of 4294967295.

This attribute is indicative of the number of frames received on this bridge port that used the tinygram compression scheme.

This attribute is indicative of the number of frames transmitted out this bridge port that used the tinygram compression scheme.

This attribute is indicative of the number of frames discarded at the in filter point. This includes a) frames discarded due to application of the filter defined with PCF for the in filter point and b) the frames discarded due to domain based filtering at the in filter point. This counter wraps around its maximum value of 4294967295.

This attribute is indicative of the number of frames discarded at the out filter point. This includes: a) frames discarded due to application of the filter defined with PCF for the out filter point and b) the frames discarded due to domain based filtering at the out filter point. This counter wraps around its maximum value of 4294967295.

This group contains all port specific, provisionable attributes associated with SourceRouteBridge ports.

An entry in the mscVrPpSrsgSrProvTable.

This attribute specifies the maximum number of hops allowed in Spanning Tree Explore and All Routes Explore frames. This value is one less than the maximum number of route descriptors allowed in a source route frame

This attribute specifies whether or not explore frames received from SourceRouteBridge ports will be sent to the SRTB-8209 translation or the encapsulated SourceRouteBridge logic. This option is used only when both the TbsrBridgePort and the SrtbBridgePort are provisioned and enabled. A value of Xlate implies that the explore frames will be sent to the Srtb translation logic and a value of Encap implies that the frames will be sent to the Encapsulated source route bridging logic. Enumeration: 'xlate': 1, 'encap': 0.

This attribute specifies the identifier for the physical LAN that this port is attached. All SourceRouteBridge ports are assigned to a physical LAN and a logical internal LAN. Current source route bridge implementations limit the lanId to a value in the range 0 to 4095.

This attribute specifies the identifier for the internal logical LAN this port is attached. All SourceRouteBridge ports are assigned to a physical LAN and a logical internal LAN. Current source route bridge implementations limit the lanId to a value in the range 0 to 4095.

This attribute specifies the value that is used to identify this bridge when more than one bridge is used to span the same two LAN segments.

This attribute specifies the maximum frame size (LLC and above) in octets, allowed by this SourceRouteBridge port. This field is used to determine whether a modification of the largest frame field of the routing control field of the routing information field is warranted.

This attribute determines how this bridge port will react when presented with a Spanning Tree Explore frame. If disabled, the Spanning Tree Explore frame is discarded regardless of the value of stpPortState. If the value of this attribute is forced, the Spanning Tree Explore frame is forwarded regardless of the value of stpPortState. autoSpan uses the stpPortState value to decide whether or not Spanning Tree Explore frames should be forwarded out this bridge port. If the port is in the forwarding state, the frame is received and transmitted otherwise the frame is discarded. Enumeration: 'disabled': 2, 'autoSpan': 1, 'forced': 3.

This attribute specifies the number of route descriptors allowed in an All Routes Explore frame received on a SourceRouteBridgePort or SourceRouteTransparentBridgePort. Current source route bridge implementations limit the areRdLimit to a value in the range 0 to 8.

This attribute specifies the number of route descriptors allowed in a Spanning Tree Explore frame received on a SourceRouteBridgePort or SourceRouteTransparentBridgePort. Current source route bridge implementations limit the steRdLimit to a value in the range 0 to 8.

This group contains all port specific statistical attributes associated with SourceRouteBridge ports.

An entry in the mscVrPpSrsgSrStatsTable.

This attribute specifies the number of specifically routed frames that were received by this bridge port. A specifically routed frame has a route descriptor, constructed by the originating host which details an explicit route to the destination host. This counter will wrap to zero when it exceeds its maximum.

This attribute specifies the number of specifically routed frames that were transmitted from this bridge port. This counter will wrap to zero when it exceeds its maximum.

This attribute specifies the number of All Path Explore frames received on this bridge port. The All Path Explore frames are forwarded to all SourceRouteBridge ports assigned to this bridge regardless of the port's portStpStates. This counter will wrap to zero when it exceeds its maximum.

This attribute specifies the number of All Path Explore frames transmitted on this bridge port. The All Path Explore frames are forwarded to all SourceRouteBridge ports assigned to this bridge regardless of the port's portStpState state. This counter will wrap to zero when it exceeds its maximum.

This attribute specifies the number of Spanning Tree Explore frames received on this bridge port. The Spanning Tree Explore frames are only forwarded through bridge ports whose portStpState has a value of forwarding. This counter will wrap to zero when it exceeds its maximum.

This attribute specifies the number of Spanning Tree Frames transmitted on this bridge port. This counter will wrap to zero when it exceeds its maximum.

This attribute specifies the number of All Routes Explore and Spanning Tree Explore frames that were discarded due to an invalid next segment value in the routing information field. This counter will wrap to zero when it exceeds its maximum.

This attribute specifies the number of frames discarded due to the presence of a duplicate segment identifier in the route descriptor field which may indicate a loop in the network topology. This counter will wrap to zero when it exceeds its maximum.

This attribute specifies the number of All Routes Explore and Spanning Tree Explore frames discarded by this bridge port due to a frame exceeding the maximum size allowed for a route descriptor length. This counter will wrap to zero when it exceeds its maximum.

This attribute specifies the number frames received which contain duplicate LAN IDs or Tree errors. This attribute is helpful in debugging problems in networks which contain older IBM-SR bridges. This counter will wrap to zero when it exceeds its maximum.

This attributes counts the number of All Routes Explore or Spanning Tree Explore frames that were discarded because the last LAN ID in the routing information field did not equal the LAN ID. This counter will wrap to zero when it exceeds its maximum.

This attribute is indicative of the number of explorer frames discarded due to fact that the outbound SourceRouteBridge port was disabled or deleted. This counter will wrap to zero when it exceeds its maximum.

This attribute specifies the number of frames discarded due to receiving a frame with a target LAN ID which did not match the internal LAN ID of the receiving bridge port. This counter will wrap to zero when it exceeds its maximum.

This entry controls the addition and deletion of mscVrPpTbsg components.

A single entry in the table represents a single mscVrPpTbsg component.

This variable is used as the basis for SNMP naming of mscVrPpTbsg components. These components can be added and deleted.

This variable provides the component's string name for use with the ASCII Console Interface

This variable represents the storage type value for the mscVrPpTbsg tables.

This variable represents the index for the mscVrPpTbsg tables.

This group houses all the provisionable attributes that belong to the this group. This group of attributes is applicable to all types of bridge ports and represent the common factor between them. These attributes influence the working of a bridge port.

An entry in the mscVrPpTbsgProvTable.

This attribute specifies the type of translation to be performed on frames carrying IPX packets. Ethernet frames carrying IPX payload could be translated to IEEE 802.3 frames (with the same IPX payload) or vice- versa. The main reason to do so is to allow the bridge unit to consistently forward one type of frames carrying IPX packets. Translations can be turned off altogether in which case the IPX frames will pass through the bridge unit unchanged. Enumeration: 'snap': 3, 'ethernet': 2, 'sap': 4, 'off': 0, 'ieee8023': 1.

This attribute specifies if or not outbound frames carrying IP datagrams should be fragmented to conform to message transfer unit (mtu) sizes dictated by the media. Enumeration: 'on': 1, 'off': 0.

This attribute specifies if the frames should be ordered or not before they are transmitted through a bridge port. If this attribute has a value of ordered the received frames are ordered as in the original message, before they are transmitted out through a bridge port. If it has a value of notOrdered, received then frames pass through the bridge unit in the order they are received. This feature can be used over multiple telecommunication links to increase data flow. Please note that this attribute only affects link protocols and is ineffective with lan media. Enumeration: 'notOrdered': 1, 'ordered': 0.

This attribute is indicative of the state of the MAC address format conversion process for ARP/RARP frames. The MAC addresses may be translated if need be from a canonical format to a non-canonical format, based on the needs of the associated media. If this attribute is set to a value of on then all Mac addresses will converted if need be to suit the format of mac address, the outgoing media will support. If this attribute is set to a value of off no such conversion takes place. Enumeration: 'on': 1, 'off': 0.

This attribute is indicative of the unique number assigned to the bridge port. It is used for SNMP management of this bridge port and in spanning tree as an identifier this bridge port. Notes regarding portNum: Escape routines exist for initializing, copying, and deleting port numbers. This is necessary because SNMP requires a unique port instance identifier. The initPortNum escape routine sets the port number to a value in the range 1-255 for this purpose. The setCopiedPortNum escape routine exists to maintain the uniqueness of the port number in cases when one port is copied to another. When a bridge port is deleted, the releasePortNum escape routine places the port number being released into a pending deletion state. This is because the port number cannot be re-allocated until the port is truely deleted in the current view. This is necessary since there is no guarantee of order when processing changes to multiple protocol ports so without the pending deletion state, the same port number could be temporarily assigned to two ports for a short period of time. The portNum is set as component critical since bridging also uses the port number as a key for indexing into its data structures. If a port is deleted then re-added under the same protocol port, CAS treats the change as a SET to the portNum attribute.

This group houses all the port specific provisionable attributes that belong to the Tb group. The Tb group is only applicable bridge port types that operate in the TB mode. These attributes in part influence the working of a bridge port operating in the TB mode.

An entry in the mscVrPpTbsgTbProvTable.

This attribute specifies whether the port secure feature is enabled. The secure feature, if enabled causes the following things to happen: a) disallows dynamic learning, b) disallows frames to be forwarded that do not satisfy the following condition: the mac address of the source should be found in the forwarding table and the destination mac address of the frame should also be found in the forwarding table. In addition to this, the port the frame was received on should figure as the in port, given the destination mac address found in the frame. c) disallows frames to be forwarded if the allowed to go port map for the destination mac address is empty. This feature in effect allows the user to choose the hosts that can generate traffic and the hosts that can receive traffic through this bridge unit. Enumeration: 'disabled': 0, 'enabled': 1.

This group houses all the port specific provisionable attributes that belong to the Stp group. The Stp group is applicable to all the bridge ports that participate in the spanning tree protocol. These attributes influence the participation of the bridge port in the spanning tree protocol.

An entry in the mscVrPpTbsgStpProvTable.

This attribute defines the current administrative state for this component. enabled indicates that the component is available for operation. disabled indicates the component is unavailable for operation. Enumeration: 'down': 2, 'up': 1.

This attribute specifies whether or not spanning tree protocol state for this bridge port is controlled by the spanning tree protocol. In essence it indicates the participation of this bridge port in the spanning tree protocol, by accepting and acting on received bridge protocol data units and by sending out the same. on signifies that this bridge port's spanning tree port state is controlled by the spanning tree protocol. A value of off signifies that the spanning tree port state of this bridge port is unaffected by the spanning tree protocol. This in effect puts the bridge port out of reach of the spanning tree protocol and in the forwarding state. Care should be taken while assigning a value of off to this attribute, as this might cause network loops. Please do not set this attribute to off unless you are absolutely sure about the effect of such an action on your network topology. Enumeration: 'on': 1, 'off': 0.

This attribute specifies the type of spanning tree protocol the port is participating in. A bridge port could participate in either the ieee8021 spanning tree protocol or the dec spanning tree protocol. If the value of the attribute protocolSpec in the SpanningTreeProtocol component, provisioned under the TransparentBridge component is in conflict with the value of this attribute, the value of the protocolSpec attribute will prevail. Prevailing stp type is reflected in the value of the attribute stpTypeOper. Enumeration: 'dec': 2, 'ieee8021': 3.

This attribute specifies the value for port priority, which is contained in the first octet of the port identifier. Valid values are as follows: 1) 0..255 for stp type DEC and 2) 0..65535 for stp type IEEE.

This attribute specifies the contribution of this port, to all the paths to the root bridge that include this port. Please note that the value of the attribute pathCostMethod is applied only when the value of the attribute pathCostMethod is set to on and is ignored if otherwise.

This attribute specifies the method used by the bridging logic, to calculate the path cost to the bridge considered to be the root bridge in the spanning tree topology. This attribute should be set to off before attempting to provision a value for pathCostProv. Enumeration: 'dec': 2, 'off': 1, 'ieee8021': 3.

This group houses all the provisionable, domain specific attributes for a non-encapsulating bridge port.

An entry in the mscVrPpTbsgDIProvTable.

This attribute specifies the domain number associated with this bridge port. Domain numbers are used for confining frames to a domain. Domain based filtering provides a complete segregation of traffic based on domain number associated with frames. There can exist only sixteen domains when a spanning tree is desired specific to each domain. When there is only a single spanning tree spanning all the domains the maximum number of domains possible are 4294967293. This attribute is of no relevance when associated with backbone bridge port. Its value is ignored in such a situation.

This attribute specifies if the domain information should be preserved or embedded in the frame header. This attribute applies only to backbone ports and does not affect the access bridge ports. By setting this attribute to a value of on, domain information could be preserved in frames being tunnelled across the a backbone, so that this information can be deciphered at the other end of the backbone tunnel. This preserves the integrity of the domains thus preventing domain breaches while tunnelling frames across backbone network. If the value of this attribute is set to off then domain information is not preserved in the header of the frames tunnelling through the backbone. This eliminates the overhead incurred to preserve domain information across the backbone while tunnelling frames across it. Preserve domain is relevant when used in conjunction with the following media: FDDI, ATM MPE, Frame Relay and PPP. It is ignored when used with other types of media. Enumeration: 'on': 1, 'off': 0.

This group contains the three OSI State attributes. The descriptions generically indicate what each state attribute implies about the component. Note that not all the values and state combinations described here are supported by every component which uses this group. For component-specific information and the valid state combinations, refer to NTP 241-7001-150, Passport Operations and Maintenance Guide.

An entry in the mscVrPpTbsgStateTable.

This attribute indicates the OSI Administrative State of the component. The value locked indicates that the component is administratively prohibited from providing services for its users. A Lock or Lock - force command has been previously issued for this component. When the value is locked, the value of usageState must be idle. The value shuttingDown indicates that the component is administratively permitted to provide service to its existing users only. A Lock command was issued against the component and it is in the process of shutting down. The value unlocked indicates that the component is administratively permitted to provide services for its users. To enter this state, issue an Unlock command to this component. Enumeration: 'locked': 0, 'shuttingDown': 2, 'unlocked': 1.

This attribute indicates the OSI Operational State of the component. The value enabled indicates that the component is available for operation. Note that if adminState is locked, it would still not be providing service. The value disabled indicates that the component is not available for operation. For example, something is wrong with the component itself, or with another component on which this one depends. If the value is disabled, the usageState must be idle. Enumeration: 'disabled': 0, 'enabled': 1.

This attribute indicates the OSI Usage State of the component. The value idle indicates that the component is not currently in use. The value active indicates that the component is in use and has spare capacity to provide for additional users. The value busy indicates that the component is in use and has no spare operating capacity for additional users at this time. Enumeration: 'active': 1, 'idle': 0, 'busy': 2.

This group includes the Operational Status attribute. This attribute defines the current operational state of this component.

An entry in the mscVrPpTbsgOperStatusTable.

The current state of the interface. The up state indicates the interface is operational and capable of forwarding packets. The down state indicates the interface is not operational, thus unable to forward packets. testing state indicates that no operational packets can be passed. Enumeration: 'down': 2, 'testing': 3, 'up': 1.

This group houses all the operational attributes belonging to the base group. The base group of attributes is applicable to all types of bridge ports and represent the common factor between them. These attributes in part, reflect the state of a bridge port.

An entry in the mscVrPpTbsgOperTable.

The attribute portName is a string of the form 'BridgePortName-i', where BridgePortName is the abbreviation of the corresponding bridge port and i is the instance identifier of the ProtocolPort, the bridge port is provisioned under. For example a TransparentBridgePort provisioned under ProtocolPort/myport would have a name TBP-myport.

This attribute specifies the accumulated up time of this bridge port since the last reset occurred.

This attribute specifies the accumulated down time of this bridge port since the last reset occurred.

This attribute specifies the mode of bridging this port can support. It in turn implies the format of frames, this bridge port can process and forward. Enumeration: 'unknown': 1, 'tb': 2, 'srt': 4, 'sr': 3.

This attribute specifies the bridge port's configuration. It indicates if the bridge port is operating as an access port or as a backbone port. An access bridge port does not encapsulate a MAC frame and does not preserve domain information in the encapsulation, whereas a backbone bridge port encapsulates the MAC frame and optionally preserves domain information in the encapsulated frame.A backbone bridge port is typically used to transport frames across a high bandwidth backbone network to another bridge unit for further processing/forwarding of the frame. Enumeration: 'access': 1, 'backbone': 2.

This attribute specifies the type of bridge port that was provisioned. It takes into consideration the bridgingMode, bridgePortConfig and the media the bridge port is linked to before branding a bridge port. Enumeration: 'fddiBridgePort': 2, 'ethernetBridgePort': 0, 'snaDlrBridgePort': 21, 'clusterTbBridgePort': 18, 'lanEmulationClientEthernet': 22, 'frameRelayBridgePort': 6, 'srtbBridgePort': 15, 'srEncapSrBridgePort': 11, 'tbsrBridgePort': 16, 'unknown': 19, 'vcpBridgePort': 9, 'clusterSrBridgePort': 17, 'srEncapTbBridgePort': 12, 'fddiEncapsulatingBridgePort': 4, 'sourceGateSrBridgePort': 13, 'sourceGateTbBridgePort': 14, 'x25BridgePort': 10, 'smdsBridgePort': 8, 'tokenRingBridgePort': 1, 'tokenBusBridgePort': 3, 'vnsBridgePort': 5, 'atmMpeBridgePort': 20, 'pppBridgePort': 7.

This attribute specifies the index into the Interface Table where in information about the media interface corresponding to the bridge port is maintained.

This attribute is indicative of the number of frames that were discarded because the time taken to process these frames exceeded the transit delay allowed for this bridge unit. This attribute is not supported by bridging and will always have a value of 0.

This attribute is indicative of the number of frames discarded because the size of the out bound frame exceeded the message transfer unit (mtu) allowed for the bridge port. Note that this counter only refers to the outbound frames for this bridge port. This counter wraps around its maximum value of 4294967295. This counter is influenced by the attribute fragmentIp. This counter is incremented when the a frame larger than the mtu allowed is encountered and cannot be fragmented. If this counter is increasing steadily, it might be useful to set the value of the attribute fragmentIp to a value of on.

This group houses all the port specific operational attributes that belong to the Tb group. This group also houses all the port specific statistical attributes that belong to the Tb group. The Tb group is only applicable bridge port types that operate in the TB mode. These attributes reflect the state of a bridge port operating in the TB mode

An entry in the mscVrPpTbsgTbOperTable.

This attribute specifies the maximum size of the information field in a TB frame. This excludes the header field.

This attribute is indicative of the number of incoming frames that were discarded because: a) the value of the secureOption attribute was set to on and b) it is not allowed to receive frames originating from the mac address found in the source address field of the frame (source mac address look up in the forwarding table failed.) on this bridge port. c) for the destination mac address found in the frame, the port the frame was received on does not appear as in port in the corresponding static table entry. Permission to receive frames from a mac address is granted via the static table entries. This attribute, badVerifyDiscards, is directly influenced by: 1. secureOption and 2. the static table entries. This counter wraps around its maximum value of 4294967295.

This attribute is indicative of the number frames discarded because the MAC address found in the destination field did not match the local MAC address of the bridge port. This counter is only applicable for the protocols that are being routed currently.This counter wraps around its maximum value of 4294967295.

This attribute is indicative of the number of frames that were discarded because of the following two reasons: a) there was no entry for the 'allowed to go' field in the static table entry, where the input port is this bridge port. b) for spanning tree bpdus that are locally processed. This counter wraps around its maximum value of 4294967295. It might prove useful to check the static table entry corresponding to the bridge port in question, if this counter consistently displays a high value. Ideally this counter should be as low as possible.

This attribute is indicative of the number of incoming frames that a) were discarded because of the fact that the bridge port, the frame is to go out of matches the bridge port it came in from or b) if the stp port state of the out port is not forwarding. This counter wraps around its maximum value of 4294967295.

This attribute is indicative of the number of frames that were discarded while this bridge port was in a state other than the forwarding state. While in learning state the frame is discarded after the information from its header is learnt. This counter wraps around its maximum value of 4294967295.

This attribute is indicative of the number of frames that were received by this bridge port and were discarded by the forwarding process. This includes frames that could have been discarded due to filtering. A repidly increasing value for this attribute could indicate a shrtage of resource in terms of memory needed to process the incoming frames. More memory can be provisioned through the VirtualRouter's memory manager.

This attribute is indicative of the number of frames that have been received by this port from its segment. Note that a frame received on this bridge port is counted if and only if it can be processed by the bridge logic contained in this bridge unit, a protocol that can be processed by the bridge logic. This counter wraps around its maximum value of 4294967295.

This attribute is indicative of the number of frames that have been transmitted out this bridge port. Note that frame transmitted out this bridge port is counted if and only if it is for a protocol being processed by the bridge unit. This also includes management frames.This counter wraps around its maximum value of 4294967295.

This group houses all the port specific operational attributes that belong to the Stp group. The Stp group is applicable to all the bridge ports that participate in the spanning tree protocol. These attributes reflect the state of the bridge port's participation in the spanning tree protocol.

An entry in the mscVrPpTbsgStpOperTable.

This attribute specifies the spanning tree protocol state of the bridge port. Enumeration: 'listening': 3, 'disabled': 1, 'broken': 6, 'learning': 4, 'forwarding': 5, 'blocking': 2.

This attribute specifies the type of spanning tree protocol the port is participating in. A bridge port could participate in either the ieee8021 spanning tree protocol or the dec spanning tree protocol. Enumeration: 'none': 0, 'dec': 2, 'ieee8021': 3.