A3COM-SWITCHING-SYSTEMS-BRIDGE-MIB

MIB Reference — IPNetwork Monitor · Updated September 09, 2026

All MIBsA3COM-SWITCHING-SYSTEMS-BRIDGE-MIB

Category: VLAN and Bridging, Vendor: 3Com

Description: Manages IEEE 802.1D bridge functions on 3Com SuperStack switching systems, covering spanning tree, forwarding database, and port settings.

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What Is A3COM-SWITCHING-SYSTEMS-BRIDGE-MIB?

This MIB manages IEEE 802.1D bridging functions on 3Com SuperStack switching systems, covering spanning tree, MAC forwarding database, and per-bridge/per-port settings across a switch's bridge instances. It exposes data such as the number of bridges and ports present, forwarding-address-table size/usage/peak-usage counts, and bridge operating mode, alongside standard spanning-tree parameters. From a status-monitoring standpoint, the address-table usage counters are especially useful for detecting when a switch's MAC table is approaching capacity, a common cause of flooding and performance degradation. It extends and works alongside the standard IETF BRIDGE-MIB (RFC 4188/1493) for base 802.1D bridge objects. It's deployed on 3Com SuperStack-series switches in enterprise LAN environments. Network engineers evaluating or troubleshooting this functionality can download the A3COM-SWITCHING-SYSTEMS-BRIDGE-MIB file directly to load it into their MIB browser.

IPNetwork Monitor allows you to monitor SNMP objects defined in A3COM-SWITCHING-SYSTEMS-BRIDGE-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 SuperStack switches

Monitoring Examples

An admin would poll a3ComSysBridgeAddressTableCount against a3ComSysBridgeAddressTableSize and a3ComSysBridgeAddressThreshold for each a3ComSysBridgeEntry in a3ComSysBridgeTable to detect a MAC table nearing exhaustion, which can cause unknown-unicast flooding. Checking a3ComSysBridgeAddressTablePeakCount over time shows historical peak load, while a3ComSysBridgeMode and a3ComSysBridgeBackbonePort reveal how the bridge instance is configured relative to the switch's backbone uplink.

What Can Be Monitored

  • bridge/port count
  • MAC forwarding table size and usage
  • MAC table peak usage
  • address table threshold
  • bridge operating mode
  • backbone port assignment
Imported Objects

From RFC-1212

OBJECT-TYPE

From RFC-1215

TRAP-TYPE

From RFC1155-SMI

Counter
IpAddress
enterprises

From RFC1213-MIB

DisplayString
OIDs

RFC description

3Com MIB for managing bridge resources and switching systems.

Start monitoring 3Com SuperStack 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 A3COM-SWITCHING-SYSTEMS-BRIDGE-MIB