LAG-MIB

MIB Reference — IPNetwork Monitor · Updated September 09, 2026

All MIBsLAG-MIB

Organization: IEEE 802.3ad Working Group

Last Updated: 1999-11-22

Category: Network Interfaces, Standard: IETF, Technology: Link Aggregation, Technology: Switching/L2

Description: IEEE 802.3ad Link Aggregation Group (LAG) MIB for managing LACP-based link bundles, member port states, and aggregator parameters.

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What Is LAG-MIB?

LAG-MIB is the standard IETF/IEEE MIB (based on IEEE 802.3ad) for managing Link Aggregation Groups formed via LACP, covering aggregator definitions, member port state, and actor/partner negotiation parameters. It exposes configuration and operational data such as aggregator MAC address, system priority and ID, admin/operational keys, and partner system identification, along with a change-tracking timestamp (dot3adTablesLastChanged). Its monitoring value is squarely in link/interface health: comparing dot3adAggActorAdminKey against dot3adAggActorOperKey reveals whether a port is successfully negotiated into its intended aggregate, and tracking dot3adAggPartnerSystemID/dot3adAggPartnerSystemPriority helps confirm the correct peer switch is on the other end of the bundle, both key to detecting a misconfigured or degraded link aggregation group. It depends on and works alongside the standard IF-MIB, since aggregator and aggregation-port entries correspond to interface indices defined there. It is deployed on any Ethernet switch or router supporting 802.3ad LACP-based link bundling, across virtually all vendors that implement the IEEE standard, commonly referenced as the ieee8023-lag-mib in vendor documentation and MIB repositories.

IPNetwork Monitor allows you to monitor SNMP objects defined in LAG-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

  • vendor-neutral, standards-based MIB, not tied to a specific manufacturer
  • Ethernet switches and routers supporting IEEE 802.3ad LACP link aggregation

Monitoring Examples

A network engineer would poll dot3adAggTable via dot3adAggIndex to read dot3adAggActorOperKey and confirm all expected member ports have negotiated into the same aggregate, flagging a port stuck outside the bundle if its key differs. dot3adAggPartnerSystemID and dot3adAggPartnerSystemPriority would be checked to verify the aggregate is forming with the expected partner switch rather than a misconnected device. dot3adTablesLastChanged would be monitored for unexpected recent changes, which often correlates with a port flap or reconfiguration event within the LAG.

What Can Be Monitored

  • aggregator MAC address
  • actor/partner system ID and priority
  • actor admin vs. operational key match
  • aggregate/individual port state
  • last-changed timestamp for aggregation tables
Imported Objects

From IF-MIB

InterfaceIndex

From SNMPv2-CONF

MODULE-COMPLIANCE
OBJECT-GROUP

From SNMPv2-SMI

BITS
Counter32
MODULE-IDENTITY
OBJECT-TYPE
TimeTicks

From SNMPv2-TC

DisplayString
MacAddress
TEXTUAL-CONVENTION
TruthValue

How to Use in IPNetwork Monitor

Example using dot3adAggPortStatsLACPDUsRx OID:

Select a device implementing LAG-MIB as the target host to create a monitor — the SNMP service should be up and running on it. Click New Monitor, then check SNMP Custom on the Favorites tab, click Next, and confirm the host. On the next page, click Select... to open the built-in SNMP MIB Browser and type dot3adAggPortStatsLACPDUsRx into the Find box to locate it in the OID tree, selecting the specific row/instance you want to monitor since this is a table column, then select it and click OK. The number of valid LACPDUs received on this Aggregation Port. On the monitor's Main parameters page you can set the target's SNMP port (default 161), credentials, polling interval, and other settings — see the SNMP Monitor help for details. On the State conditions and Alerting tabs, configure when the monitor should change state and trigger an alert; since this is a Counter32-type OID, Value bounds is the most useful condition here — trigger an alert if the counter increases sharply between polls relative to its normal baseline, since an unexpected spike often reflects a real change in traffic or activity. Click Finish to create the monitor; you can adjust any parameter later.
OIDs

RFC description

IEEE 802.3ad Link Aggregation management for logical port aggregation and LACP protocol.

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Download LAG-MIB