CENTILLION-VIRTUALSEGMENT-MIB

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Category: ATM, Vendor: Nortel

Description: Manages virtual LAN segments and their port assignments on Nortel Centillion switch platforms.

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What Is CENTILLION-VIRTUALSEGMENT-MIB?

CENTILLION-VIRTUALSEGMENT-MIB is a vendor-specific MIB for Nortel (Bay Networks) Centillion ATM switches that manages virtual LAN segments and the mapping of switch ports to those segments, an early form of VLAN implemented over the switch's ATM/LAN emulation fabric. It exposes configuration and status data including the total configured and active virtual segment counts, a per-segment table with segment type, ID, status, associated ifIndex, and both configured and active port counts. In monitoring terms it primarily supports software/configuration-level monitoring -- verifying a virtual segment's status is active, its port count matches expectations, and that configured versus active counts align, which helps catch stale or partially-applied VLAN configurations rather than raw hardware faults. It relies on the switch's underlying LAN emulation/ATM hardware and ifIndex-based interface model (aligned with IF-MIB conventions) to associate segments with physical ports. It would typically be deployed on legacy Nortel Centillion ATM switches implementing early virtual LAN segmentation. Engineers can download the CENTILLION-VIRTUALSEGMENT-MIB file directly to load it into their MIB browser.

IPNetwork Monitor allows you to monitor SNMP objects defined in CENTILLION-VIRTUALSEGMENT-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 switch

Monitoring Examples

An administrator would poll virtualSegmentTable/virtualSegmentEntry to check virtualSegmentStatus for a given virtualSegmentId, and compare virtualSegmentConfiguredPortNumber against virtualSegmentActivePortNumber to detect ports that were configured into a segment but never came up. virtualSegmentConfigNumber versus virtualSegmentActiveNumber at the switch level would similarly reveal if some configured virtual segments failed to activate after a reload. This is a configuration-verification use case for VLAN-like segmentation rather than hardware fault detection.

What Can Be Monitored

virtual segment status
configured vs active segment count
configured vs active port count per segment
segment type and ID

Imported Objects

From CENTILLION-BRIDGEGROUP-MIB

BridgeGroupId

From CENTILLION-ROOT-MIB

Boolean
StatusIndicator
sysConfig	OBJECT-IDENTITY

From RFC-1212

OBJECT-TYPE

From RFC1213-MIB

DisplayString

OIDs

OID symbolic	OID numeric	Type	Access	Description
INT virtualSegmentActiveNumber	1.3.6.1.4.1.930.2.1.2.23.2	INTEGER	read-only	The total number of active virtual segments in the system.
INT virtualSegmentActivePortNumber	1.3.6.1.4.1.930.2.1.2.23.3.1.6	INTEGER	read-only	The number of active ports in this VSegment.
INT virtualSegmentAdminEncapsulation	1.3.6.1.4.1.930.2.1.2.23.3.1.8	INTEGER	read-write	The encapulation used for generating management frames for multicast, broadcast and unknown destinations. The default values are specific to the virtualSemgentTypeId and are assigned as follows: token-ring: iso88025-tokenRing, ethernet: ethernet-iso88023 Allowable values are also dependant on the virtualSegmentTypeId.
BRI virtualSegmentBridgeGroupIdentifier	1.3.6.1.4.1.930.2.1.2.23.3.1.9	BridgeGroupId	read-only	The spanning tree group identifier corresponding to this virtual segment.
INT virtualSegmentConfigNumber	1.3.6.1.4.1.930.2.1.2.23.1	INTEGER	read-only	The total number of configured virtual segments in the system.
INT virtualSegmentConfiguredPortNumber	1.3.6.1.4.1.930.2.1.2.23.3.1.5	INTEGER	read-only	The number of ports configured in this VSegment.
virtualSegmentEntry	1.3.6.1.4.1.930.2.1.2.23.3.1		not-accessible	A single entry in the virtual segment table. Virtual segments may be added by specifying a valid status for a non-existant entry in the table. Note that if no other values are specified in the set request, they are defaulted to a value as appropriate to the type of virtual Segment.
virtualSegmentGroup	1.3.6.1.4.1.930.2.1.2.23
STR virtualSegmentGroupName	1.3.6.1.4.1.930.2.1.2.23.3.1.10	DisplayString	read-write	The MLT group name corresponding to this virtual segment. This value is used for ethernet vsegment type and is ignored for a token ring vsegment type.
BOO virtualSegmentGroupServer	1.3.6.1.4.1.930.2.1.2.23.3.1.11	Boolean	read-write	Used to indicate a server is attached to this MLT group. Default condition is false (no server attached to this MLT group).
INT virtualSegmentId	1.3.6.1.4.1.930.2.1.2.23.3.1.2	INTEGER	read-write	The virtual segment identifier. The identifier is interpreted based upon the virtualSegmentType object. For example, the virtualSegmentIdentifier for a token-ring VSegment is the ring number. This identifier must be unique across local VSegments within the specific virtualSegmentType.
INT virtualSegmentIfIndex	1.3.6.1.4.1.930.2.1.2.23.3.1.4	INTEGER	read-only	The value of the instance of the ifIndex object, defined in MIB-II, for the interface corresponding to this VSegment.
INT virtualSegmentPortCardNumber	1.3.6.1.4.1.930.2.1.2.23.4.1.3	INTEGER	read-write	The card number for this port in the virtual Segment.
virtualSegmentPortEntry	1.3.6.1.4.1.930.2.1.2.23.4.1		not-accessible	An entry in the virtual Segment port table. Entries are added by specifying the virtualSegmentPortType, virtualSegmentPortIdentifier, virtualSegmentPortCardNumber, and virtualSegmentPortPortNumber. Entries may be deleted simply by invalidating the virtualSegmentPortStatus object.
INT virtualSegmentPortId	1.3.6.1.4.1.930.2.1.2.23.4.1.2	INTEGER	read-write	The virtual segment identifier of which this port is a member.
INT virtualSegmentPortIfIndex	1.3.6.1.4.1.930.2.1.2.23.4.1.6	INTEGER	read-only	The value for this object identifies the instance of the ifIndex object defined in MIB-II, for the interface corresponding to this port. If no such entry exists, the value 0 may be returned.
INT virtualSegmentPortPortNumber	1.3.6.1.4.1.930.2.1.2.23.4.1.4	INTEGER	read-write	The port number for this port in the virtual Segment.
STA virtualSegmentPortStatus	1.3.6.1.4.1.930.2.1.2.23.4.1.5	StatusIndicator	read-write	The current status of the entry. Entries may be added by specifying a value of valid, and removed by setting the status to invalid.
virtualSegmentPortTable	1.3.6.1.4.1.930.2.1.2.23.4		not-accessible	The Virtual Segment port configuration table. This table contains information pertaining to the ports belonging to a virtual segment.
VIR virtualSegmentPortType	1.3.6.1.4.1.930.2.1.2.23.4.1.1	VirtualSegmentTypeId	read-write	The virtual segment type of which this port is a member.
OID virtualSegmentSpecific	1.3.6.1.4.1.930.2.1.2.23.3.1.7	OBJECT IDENTIFIER	read-only	The object identifier to reference the corresponding instance in a VSegment specific MIB. If this information is not present, its value is set to the OBJECT IDENTIFIER { 0 0 }.
STA virtualSegmentStatus	1.3.6.1.4.1.930.2.1.2.23.3.1.3	StatusIndicator	read-write	The current status of the virtual Segment entry. VSegments may be added by specifiying a valid status, and removed by specifying an invalid status.
virtualSegmentTable	1.3.6.1.4.1.930.2.1.2.23.3		not-accessible	The Virtual Segment table. The virtual segment table contains information pertaining the each virtual segment in the system.
VIR virtualSegmentType	1.3.6.1.4.1.930.2.1.2.23.3.1.1	VirtualSegmentTypeId	read-write	The virtual segment type. When the type is ethernet, a MLT group will be created. When the type is token ring, a token ring vsegment is created.

RFC description

Manages virtual network segments and bridge groups in Nortel Centillion switching platforms.

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Download CENTILLION-VIRTUALSEGMENT-MIB

What Is CENTILLION-VIRTUALSEGMENT-MIB?

Supported Devices

Monitoring Examples

What Can Be Monitored

This MIB depends on

Related MIBs

RFC description