GENERIC-3COM-TRUNK-MIB

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Category: Technology: Link Aggregation, Vendor: 3Com

Description: Handles port trunking and link aggregation group configuration on 3Com equipment through a generic trunk MIB.

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What Is GENERIC-3COM-TRUNK-MIB?

GENERIC-3COM-TRUNK-MIB is a 3Com vendor MIB, under the a3Com/generic/genExperimental enterprise branch, that models link-aggregation TRUNK interfaces shared across 3Com network devices such as the LANplex switching platform. It defines a3ComTrunkIfTable for trunk interface creation, naming, and TCMP (Trunk Control Message Protocol) enablement (a3ComTrunkTcmpEnable) plus link-speed mode (a3ComTrunkMacMode) and row lifecycle via a3ComTrunkIfStatus, a3ComTrunkMacTable tracking the state of each MAC/port within a trunk (a3ComTrunkTcmpMacState: notInUse/selected/inUse when TCMP is active, or undefined/down/up/configured when it is not), and a3ComTrunkTcmpPeersTable listing neighboring MAC addresses discovered via TCMP on each trunk member. Trunk interfaces also appear in the standard ifTable via ifStackTable relationships, so this module supplements that standard interface data with trunk-specific membership and protocol state. This is useful for confirming that all expected physical ports have successfully joined a trunk (link aggregation group) and that TCMP peer discovery matches the intended topology, important for detecting a port that failed to aggregate or an unexpected peer on the link. It depends on the ifStackTable interface-stacking model for representing trunk membership. It is deployed on 3Com network devices that support TRUNK link aggregation, and engineers reference the GENERIC-3COM-TRUNK-MIB MIB when polling this trunking state.

IPNetwork Monitor allows you to monitor SNMP objects defined in GENERIC-3COM-TRUNK-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

3Com network devices supporting TRUNK link aggregation (e.g., LANplex switching platforms)

Monitoring Examples

An operator polls a3ComTrunkMacTable for each MAC in a trunk to confirm a3ComTrunkTcmpMacState reads inUse for all expected ports, and checks a3ComTrunkTcmpPeersTable for the discovered peer MAC addresses; a port stuck at selected instead of inUse would indicate it has not transitioned into active trunk participation, effectively reducing the aggregate's available bandwidth.

What Can Be Monitored

trunk interface configuration and row status
TCMP protocol enablement per trunk
per-MAC trunk membership state (in-use/selected/down)
TCMP peer discovery table entries
trunk link-speed mode configuration

Imported Objects

From RFC-1212

OBJECT-TYPE

From RFC1155-SMI

IpAddress
enterprises

From RFC1213-MIB

DisplayString
PhysAddress

OIDs

OID symbolic	OID numeric	Type	Access	Description
a3Com	1.3.6.1.4.1.43
generic	1.3.6.1.4.1.43.10
genExperimental	1.3.6.1.4.1.43.10.1
genTrunk	1.3.6.1.4.1.43.10.1.15
a3ComTrunkGroup	1.3.6.1.4.1.43.10.1.15.1
a3ComTrunkIfTable	1.3.6.1.4.1.43.10.1.15.1.1		not-accessible	This table lists TRUNK interfaces that exist within a device. A single entry exists in this list for each TRUNK interface in the system.
a3ComTrunkIfEntry	1.3.6.1.4.1.43.10.1.15.1.1.1		not-accessible	An individual Trunk interface entry. When an NMS wishes to create a new entry in this table, it must obtain a non-zero index from the a3ComNextAvailableVirtIfIndex which is defined in a3ComVirtualGroup. Row creation in this table will fail if the chosen index value does not match the current value returned from the a3ComNextAvailableVirtIfIndex object.
INT a3ComTrunkIfIndex	1.3.6.1.4.1.43.10.1.15.1.1.1.1	INTEGER	not-accessible	The index value of this row and the Trunk's ifIndex in the ifTable. The NMS obtains the index value to create new row by reading the a3ComNextAvailableVirtIfIndex object which is the same as the one defined in a3ComVirtualGroup,
STR a3ComTrunkIfName	1.3.6.1.4.1.43.10.1.15.1.1.1.2	DisplayString	read-write	This is the name of this TRUNK interface.
INT a3ComTrunkTcmpEnable	1.3.6.1.4.1.43.10.1.15.1.1.1.3	INTEGER	read-write	This object specifies if the Trunk Control Message Protocol(TCMP) is currently enabled for operation on a specific trunk. TCMP is used to dynamically control the configuration and operation of a trunk port and its constituent MACs.
INT a3ComTrunkMacMode	1.3.6.1.4.1.43.10.1.15.1.1.1.4	INTEGER	read-write	This object controls the Trunk physical link speed. When a port is added to this Trunk, it is switched to the specified speed, regardless of its previous speed setting. All ports; therefore, will be running on the specified speed.
ROW a3ComTrunkIfStatus	1.3.6.1.4.1.43.10.1.15.1.1.1.5	RowStatus	read-write	The status column for this TRUNK interface. This OBJECT can be set to: createAndGo(4) destroy(6) The following values may be read: active(1) notReady(3). Setting this object to createAndGo(4) causes the agent to attempt to create and commit the row based on the contents of the objects in the row. If all necessary information is present in the row and the values are acceptible to the agent, the agent will change the status to notReady(3). If any of the necessary objects are not available, the agent will reject the creation request. The state of the row transits to active(1) if and only if MAC(s) has/have been added to this entry through ifStackTable and system is ready. Setting this object to destroy(6) will remove the corresponding TRUNK interface and remove the entry in this table. In order for a set of this object to destroy(6) to succeed, all dependencies on this row must have been removed. These will include any stacking dependencies in the ifStackTable.
a3ComTrunkMacTable	1.3.6.1.4.1.43.10.1.15.1.2		not-accessible	A list of information about state of TRUNK MAC(s) in a TRUNK interface. If TCMP is not enabled, the MAC status is tied to the link status.
a3ComTrunkMacEntry	1.3.6.1.4.1.43.10.1.15.1.2.1		not-accessible	An individual TRUNK group MAC entry status.
INT a3ComTrunkMacTrunkIfIndex	1.3.6.1.4.1.43.10.1.15.1.2.1.1	INTEGER	not-accessible	This object is the same as a3ComTrunkIfIndex defined in a3ComTrunkIfTable.
INT a3ComTrunkMacIndex	1.3.6.1.4.1.43.10.1.15.1.2.1.2	INTEGER	not-accessible	This object identifies the ifIndex in the ifTable of a media access control (MAC) interface in the system.
INT a3ComTrunkTcmpMacState	1.3.6.1.4.1.43.10.1.15.1.2.1.3	INTEGER	read-only	The state column for this MAC TRUNK entry if TCMP is enabled. The following values may be read: notInUse: corresponding MAC has not been selected for active participation in trunk. No LLC frames will be transmitted or received. selected: corresponding MAC is selected for active participation in the trunk, but it has not transited to active use. inUse: corresponding MAC is in active use on the trunk. The following values may be read if TCMP is disabled: undefined: corresponding MAC is undefined down: corresponding MAC is selected as a trunk port but is down up: corresponding MAC is selected and in use configured: corresponding MAC is configured as TRUNK MAC
a3ComTrunkTcmpPeersTable	1.3.6.1.4.1.43.10.1.15.1.3		not-accessible	This table lists neighbouring information for a MAC in a Trunk interface.
a3ComTrunkTcmpPeersEntry	1.3.6.1.4.1.43.10.1.15.1.3.1		not-accessible	Information about a particular peer of a MAC within the trunk.
INT a3ComTrunkPeerTrunkIfIndex	1.3.6.1.4.1.43.10.1.15.1.3.1.1	INTEGER	not-accessible	This object is the same as a3ComTrunkIfIndex defined in a3ComTrunkIfTable.
INT a3ComTrunkPeerMacIndex	1.3.6.1.4.1.43.10.1.15.1.3.1.2	INTEGER	not-accessible	This object identifies the ifIndex in the ifTable of a media access control (MAC) interface in the system.
PHY a3ComTrunkPeersMacAddress	1.3.6.1.4.1.43.10.1.15.1.3.1.3	PhysAddress	read-only	The MAC address of a peer connected to the a3ComTrunkPeerMacIndex identified by this entry.

RFC description

3Com generic trunk MIB for managing port trunking and link aggregation group configuration.

Start monitoring 3Com network device supporting TRUNK link aggregation (e.g. LANplex) 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 GENERIC-3COM-TRUNK-MIB

What Is GENERIC-3COM-TRUNK-MIB?

Supported Devices

Monitoring Examples

What Can Be Monitored

This MIB depends on

Related MIBs

RFC description