A3COM-BRIDGE-R3-MIB

MIB Reference — IPNetwork Monitor · Updated September 09, 2026

All MIBsA3COM-BRIDGE-R3-MIB

Category: VLAN and Bridging, Vendor: 3Com

Description: Manages bridging functions on 3Com network devices, including spanning tree and forwarding database objects.

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What Is A3COM-BRIDGE-R3-MIB?

A3COM-BRIDGE-R3-MIB is a 3Com-proprietary revision of bridging-management objects for 3Com Ethernet switches and bridges, extending beyond the standard IETF BRIDGE-MIB (RFC 1493/4188). It exposes objects for spanning-tree protocol state and the forwarding (learned MAC address) database, i.e., bridge/switch configuration and Layer-2 topology data. In monitoring terms it is used to check spanning-tree port roles/states (to catch topology changes, loops, or blocked ports) and forwarding-database size/contents (to catch MAC table exhaustion or unexpected address churn) rather than hardware health per se. It clearly depends on and extends the standard BRIDGE-MIB conventions (dot1dBase/dot1dStp/dot1dTp groups), reusing its object model for 3Com-specific bridge instances. It would be deployed on legacy 3Com SuperStack/CoreBuilder-era Ethernet switches needing bridging visibility beyond what the standard MIB provided at the time. Engineers can download the A3COM-BRIDGE-R3-MIB file directly to load it into their MIB browser.

IPNetwork Monitor allows you to monitor SNMP objects defined in A3COM-BRIDGE-R3-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 Ethernet switch/bridge (legacy SuperStack/CoreBuilder-era)

Monitoring Examples

No concrete object names were supplied for this module, so specific OIDs can't be cited; a realistic use, per the module's stated scope, would be polling per-port spanning-tree state to detect a port unexpectedly moving into blocking/discarding state (indicating a topology change or loop), and checking forwarding-database entry counts to detect table overflow from a MAC flooding condition. Confirming exact object names would require the underlying MIB source.

What Can Be Monitored

  • spanning tree port state
  • spanning tree topology changes
  • forwarding database (MAC table) entries
  • bridge configuration parameters
Imported Objects

From RFC-1212

OBJECT-TYPE

From RFC1155-SMI

enterprises

From RFC1286-MIB

MacAddress
OIDs

RFC description

Manages bridging functions including spanning tree and forwarding database on 3Com network devices.

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Download A3COM-BRIDGE-R3-MIB