CENTILLION-BRIDGEGROUP-MIB

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Category: ATM, VLAN and Bridging, Vendor: Nortel

Description: Manages bridge group configuration for LAN emulation and switched fabric ports on Nortel Centillion switches.

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What Is CENTILLION-BRIDGEGROUP-MIB?

CENTILLION-BRIDGEGROUP-MIB manages bridge group configuration on Nortel Centillion ATM/LAN switches, defining how physical and switched-fabric ports are grouped into IEEE 802.1D bridge instances for LAN emulation. It exposes bridge group identifiers, status, base bridging type, spanning-tree protocol selection, and Token Ring source-route bridging (RIF) parameters per bridge group. Its primary monitoring value is configuration/state visibility rather than raw performance counters: administrators use it to confirm a bridge group's operational status and spanning-tree mode, which helps diagnose bridging loops or misconfigured LAN emulation domains. It explicitly extends the standard IETF BRIDGE-MIB (dot1dBase) conventions with Centillion-specific bridge-group semantics. It is used in legacy Nortel Centillion switch deployments that combine ATM and Ethernet/Token Ring bridging in the same chassis. Engineers can download the CENTILLION-BRIDGEGROUP-MIB file directly to load it into their MIB browser.

IPNetwork Monitor allows you to monitor SNMP objects defined in CENTILLION-BRIDGEGROUP-MIB. Use the built-in SNMP Monitoring Browser to explore available variables, view their current values and descriptions, and select the objects you want to monitor. You can then create SNMP monitors, configure thresholds, and receive alerts when monitored values change.

Supported Devices

Nortel Centillion ATM/LAN switch

Monitoring Examples

An operator would inspect bridgeGroupTable/bridgeGroupEntry, keyed by bridgeGroupIdentifier, to check bridgeGroupStatus and bridgeGroupStpProtocol for a given bridge group and confirm it is active with the expected spanning-tree behavior. bridgeGroupPortType and bridgeGroupNextPortIndex reveal which ports are currently members of the group, useful when troubleshooting an unexpected topology change. bridgeGroupTbRifEnable and bridgeGroupTbRifRing would be checked on Token Ring segments to verify source-route bridging configuration.

What Can Be Monitored

bridge group operational status
spanning-tree protocol mode
bridge group port membership
bridge base type
Token Ring RIF bridging configuration

Imported Objects

From CENTILLION-ROOT-MIB

EnableIndicator
StatusIndicator
sysConfig	OBJECT-IDENTITY

From RFC-1212

OBJECT-TYPE

OIDs

OID symbolic	OID numeric	Type	Access	Description
bridgeGroup	1.3.6.1.4.1.930.2.1.2.24
INT bridgeGroupBaseType	1.3.6.1.4.1.930.2.1.2.24.2.1.3	INTEGER	read-write	Indicates the type of bridging this spanning tree group is performing.A value of none(1) implies that switching is performed between ports in this spanning tree group. A value of unknown(2) implies that some unknown bridging rules are applied on the ports in this spanning tree group. Modifying the bridgeGroupBaseType requires a complete reset of the spanning tree group. This value must be specified during spanning tree group creation.
bridgeGroupEntry	1.3.6.1.4.1.930.2.1.2.24.2.1		not-accessible	An entry in the spanning tree group table. Spanning tree groups are added by specifying a bridgeGroupIdentifier, bridgeGroupBaseType, bridgeGroupStpProtocol and a bridgeGroupPortType with a value of valid(1) in bridgeGroupStatus. Entries may be deleted by specifying an entry with an value of invalid(2) in bridgeGroupStatus.
BRI bridgeGroupIdentifier	1.3.6.1.4.1.930.2.1.2.24.2.1.1	BridgeGroupId	read-write	The unique spanning tree group identifier of this spanning tree group.
INT bridgeGroupNextPortIndex	1.3.6.1.4.1.930.2.1.2.24.2.1.6	INTEGER	read-only	The value of the next spanning tree group port number which will be assigned by the switch. When adding spanning tree group ports bridging mode, the specified bridgeGroupPortIndex must match this value.
bridgeGroupPortEntry	1.3.6.1.4.1.930.2.1.2.24.3.1		not-accessible	A list of information for each port of the spanning tree group. These entries are created and deleted by switch.
ENA bridgeGroupPortFastStart	1.3.6.1.4.1.930.2.1.2.24.3.1.6	EnableIndicator	read-write	When FastStart is enabled, a port uses the minimum of hello time and forward delay time for transition from listening to learning to forwarding state. Once the port is in forwarding state, it will behave as a normal spanning tree port.
BRI bridgeGroupPortGroupId	1.3.6.1.4.1.930.2.1.2.24.3.1.1	BridgeGroupId	read-only	The spanning tree group identifier to which this port belongs.
INT bridgeGroupPortIfIndex	1.3.6.1.4.1.930.2.1.2.24.3.1.4	INTEGER	read-write	The value of the instance of the ifIndex object, defined in MIB-II, for the interface corresponding to this port. Spanning tree group ports are added by specifying the ifIndex instance for the spanning tree group port.
INT bridgeGroupPortIndex	1.3.6.1.4.1.930.2.1.2.24.3.1.2	INTEGER	read-only	The value of the instance of the dot1dBasePort object, defined in the Bridge MIB, for the spanning tree group port corresponding to this port.
INT bridgeGroupPortSpanMode	1.3.6.1.4.1.930.2.1.2.24.3.1.5	INTEGER	read-write	In SR mode, this object determines how this port behaves when presented with a Spanning Tree Explorer frame. The value 'disabled(2)' indicates that the port will not accept or send Spanning Tree Explorer packets; any STE packets received will be silently discarded. The value 'forced(3)' indicates the port will always accept and propagate Spanning Tree Explorer frames. This allows a manually configured Spanning Tree for this class of packet to be configured. Note that unlike transparent bridging, this is not catastrophic to the network if there are loops. The value 'auto-span(1)' can only be returned by a bridge that both implements the Spanning Tree Protocol and has use of the protocol enabled on this port. The behavior of the port for Spanning Tree Explorer frames is determined by the state of dot1dStpPortState. If the port is in the 'forwarding' state, the frame will be accepted or propagated. Otherwise, it will be silently discarded. In TB mode, this object provides the means to statically configure a port to forwarding/blocking modes. 'disabled(2)' indicates that the port is statically configured to blocking mode. 'forced(3)' indicates that the port is statically configured to forwarding mode. 'auto-span(1)' indicates that STP protocol is running.
STA bridgeGroupPortStatus	1.3.6.1.4.1.930.2.1.2.24.3.1.3	StatusIndicator	read-only	The current status of the spanning tree group port entry. Spanning tree group ports is added or deleted when a virtual segment port is added to or deleted from a virtual segment.
bridgeGroupPortTable	1.3.6.1.4.1.930.2.1.2.24.3		not-accessible	A table that contains information about each port that is associated with this spanning tree group.
INT bridgeGroupPortType	1.3.6.1.4.1.930.2.1.2.24.2.1.5	INTEGER	read-write	Indicates the type of the spanning tree group ports. This value may only be altered if there are no spanning tree group ports currentlyin the spanning tree group. This value must be specified during spanning tree group creation.
STA bridgeGroupStatus	1.3.6.1.4.1.930.2.1.2.24.2.1.2	StatusIndicator	read-write	The current status of the spanning tree group. Spanning tree groups may be added by specifiying a valid status, and removed by specifying an invalid status.
INT bridgeGroupStpProtocol	1.3.6.1.4.1.930.2.1.2.24.2.1.4	INTEGER	read-write	An indication of the version of the Spanning Tree Protocol is being run, if the value of bridgeGroupBaseType is not none(1). This field may be ignored if the bridgeGroupBaseType value is none(1).
bridgeGroupTable	1.3.6.1.4.1.930.2.1.2.24.2		not-accessible	A specific spanning tree group. A spanning tree group consists of a number of bridging ports running the same spanning tree protocol.
ENA bridgeGroupTbRifEnable	1.3.6.1.4.1.930.2.1.2.24.2.1.7	EnableIndicator	read-write	Enables the learning of Rif's by Token Ring Transparent Bridging spanning tree groups and processing of LE_ARP's for route descrptors.
INT bridgeGroupTbRifRing	1.3.6.1.4.1.930.2.1.2.24.2.1.8	INTEGER	read-write	The value of the ring used for learning RIF's when bridgeGroupTbRifEnable is set.
BRI dot1dBaseGroupIdentifier	1.3.6.1.4.1.930.2.1.2.24.1	BridgeGroupId	read-write	The spanning tree group identifier for which the standard bridging MIBS apply. Modifications of the spanning tree group through the standard bridging MIBs effect this spanning tree group only. This object is super governed by specific SET community string. For example if a network management station uses SET community string setcommunitystring@bg3, all related SET requests will effect spanning tree group 3 only.

RFC description

Spanning tree and bridge group configuration for Centillion network switches.

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Download CENTILLION-BRIDGEGROUP-MIB

What Is CENTILLION-BRIDGEGROUP-MIB?

Supported Devices

Monitoring Examples

What Can Be Monitored

This MIB depends on

Related MIBs

RFC description