CENTILLION-VLAN-MIB

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Category: ATM, VLAN and Bridging, Vendor: Nortel

Description: Manages VLAN configuration and port VLAN membership on Nortel Centillion ATM/LAN switch platforms.

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What Is CENTILLION-VLAN-MIB?

CENTILLION-VLAN-MIB manages VLAN configuration and port membership on Nortel Centillion ATM/LAN switch platforms, letting administrators define VLANs and assign switch ports (including ATM/Token Ring 'ring' ports) to them. It exposes per-port VLAN membership entries, including card and port identifiers, VLAN ID (VID), membership status, ingress tagging type, and whether the membership was statically configured or dynamically learned. Its monitoring value is chiefly configuration/state verification: administrators check port VLAN assignments and status to confirm a port is in the expected VLAN and to catch unintended dynamic VLAN membership changes that could indicate a misconfiguration or security issue. It builds on general VLAN/802.1Q bridging concepts adapted for Centillion's ATM/LAN-emulation fabric and interacts with CENTILLION-BRIDGEGROUP-MIB and CENTILLION-LESBUS-MIB. It is used in legacy Nortel Centillion switch deployments carrying multiple VLANs across ATM backbones, where CENTILLION-VLAN-MIB SNMP monitoring helps confirm VLAN port assignments remain correctly configured.

IPNetwork Monitor allows you to monitor SNMP objects defined in CENTILLION-VLAN-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 administrator would poll cnVlanPortMemberTable/cnVlanPortMemberEntry, keyed by cnVlanPortMemberCard and cnVlanPortMemberPort, to verify cnVlanPortMemberVID and cnVlanPortMemberStatus for a given port and confirm it belongs to the intended VLAN. cnVlanPortMemberDynamic reveals whether a port's VLAN membership was learned dynamically rather than statically assigned, useful when diagnosing an unexpected VLAN hop. cnVlanPortMemberIngressType and cnVlanPortMemberIfIndex tie the VLAN entry back to the underlying interface for cross-referencing with standard interface statistics.

What Can Be Monitored

VLAN port membership
VLAN ID per port
membership status (static/dynamic)
ingress tagging type
port-to-VLAN mapping

Imported Objects

From CENTILLION-MCAST-MIB

VlanId
vlan	OBJECT-IDENTITY

From IF-MIB

InterfaceIndex

From RFC-1212

OBJECT-TYPE

From SNMPv2-TC-v1

RowStatus
TruthValue

OIDs

OID symbolic	OID numeric	Type	Access	Description
cnVlanMemberGroup	1.3.6.1.4.1.930.2.1.2.31.2
cnVlanPortMemberTable	1.3.6.1.4.1.930.2.1.2.31.2.1		not-accessible	The VLAN port membership configuration table. This table contains membership information pertaining to the ports belonging to a VLAN.
cnVlanPortMemberEntry	1.3.6.1.4.1.930.2.1.2.31.2.1.1		not-accessible	An entry containing VLAN membership information for a particular port. Entries are added by specifying the cnVlanPortMemberCard, cnVlanPortMemberPort, cnVlanPortMemberVID, and the cnVlanPortMemberIngressType. Entries are deleted simply by setting the cnVlanPortMemberStatus object to destroy.
INT cnVlanPortMemberCard	1.3.6.1.4.1.930.2.1.2.31.2.1.1.1	INTEGER	read-only	The card number for this port in the VLAN.
INT cnVlanPortMemberPort	1.3.6.1.4.1.930.2.1.2.31.2.1.1.2	INTEGER	read-only	The port number for this port in the VLAN.
VLA cnVlanPortMemberVID	1.3.6.1.4.1.930.2.1.2.31.2.1.1.3	VlanId	read-only	The VLAN ID of which this port is a member.
ROW cnVlanPortMemberStatus	1.3.6.1.4.1.930.2.1.2.31.2.1.1.4	RowStatus	read-write	The current status of the entry. Entries may be added by specifying a value of createAndGo, and removed by setting the status to destroy.
INT cnVlanPortMemberIngressType	1.3.6.1.4.1.930.2.1.2.31.2.1.1.5	INTEGER	read-write	The method used to classify ingress frames on this port into this VLAN. The allowed values are specific to the cnVlanType of the VLAN as follows: byPort: pvid or tag byProtocolId: pvid, tag, or protocolId Allowable values may also be restricted by the VLAN capabilities of this port.
T/F cnVlanPortMemberDynamic	1.3.6.1.4.1.930.2.1.2.31.2.1.1.6	TruthValue	read-only	The value for this object indicates whether the switch learned this port's VLAN membership dynamically.
NUM cnVlanPortMemberIfIndex	1.3.6.1.4.1.930.2.1.2.31.2.1.1.7	InterfaceIndex	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 and VLAN. If no such entry exists, the value 0 may be returned.
INT cnVlanPortMemberRing	1.3.6.1.4.1.930.2.1.2.31.2.1.1.8	INTEGER	read-write	The ring number for this port if this VLAN uses source route or source route transparent bridging.
VLA cnVlanENETMgt	1.3.6.1.4.1.930.2.1.2.31.3	VlanId	read-write	VID of the Ethernet management VLAN. The null VID indicates that an Ethernet management VLAN is not configured.
VLA cnVlanTRMgt	1.3.6.1.4.1.930.2.1.2.31.4	VlanId	read-write	VID of the Token Ring management VLAN. The null VID indicates that an Token Ring management VLAN is not configured.

RFC description

Bay Networks Centillion VLAN configuration and port membership management.

Start monitoring Nortel/Bay Networks Centillion ATM/LAN switches (legacy) with a free 30-day trial of IPNetwork Monitor. Import MIBs, browse SNMP OIDs, create custom SNMP monitors, configure alerts, and monitor any SNMP-enabled network device from a single console.

Download CENTILLION-VLAN-MIB

What Is CENTILLION-VLAN-MIB?

Supported Devices

Monitoring Examples

What Can Be Monitored

This MIB depends on

Related MIBs

RFC description