All MIBs › CISCOSB-BRGMACSWITCH-MIB
Organization: Cisco Small Business
Last Updated: 2007-01-02
Category: VLAN and Bridging, Vendor: RADLAN/Cisco SB
Description: Manages Cisco Small Business bridge MAC address switching tables and forwarding database entries.
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What Is CISCOSB-BRGMACSWITCH-MIB?
CISCOSB-BRGMACSWITCH-MIB is a private Cisco Small Business MIB that manages Layer 2 bridge MAC address switching and forwarding database behavior on small-business switch platforms. It exposes configuration data about MAC address table sizing, aging/deletion mode for stale entries, spanning-tree interaction, and traffic-threshold alerting for the switching subsystem. Its monitoring value lies in software/operational status: tracking rlBrgMacSwDynamicTables and rlBrgMacSwOldEntryDeleteMode reveals how the forwarding table is behaving under load, while rlBrgMacSwOperTrapCount and the yellow/red boundary thresholds flag when MAC table utilization is approaching capacity, a common precursor to flooding or lookup failures. It has no strong stated dependency beyond standard bridge MIB concepts (IEEE 802.1D bridging) that it privately re-implements. It is typically deployed on Cisco Small Business (SB/SG series) managed switches in SMB network closets. Engineers can download the CISCOSB-BRGMACSWITCH-MIB file directly to load it into their MIB browser.
IPNetwork Monitor allows you to monitor SNMP objects defined in CISCOSB-BRGMACSWITCH-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
- Cisco Small Business (SB/SG series) managed switch
Monitoring Examples
An administrator would read rlBrgMacSwMaxTableNumber alongside rlBrgMacSwDynamicTables to see current MAC table occupancy versus capacity, and check rlBrgMacSwYellowBoundary/rlBrgMacSwRedBoundary to know at what fill level a warning or critical trap fires. A rising rlBrgMacSwOperTrapCount combined with rlBrgMacSwAdminTrapFrequency indicates the switch is repeatedly crossing the configured MAC-table threshold, suggesting MAC flooding or an oversized broadcast domain. rlBrgMacSwSpanningTree can be checked to confirm STP integration is enabled where loop protection is expected.
What Can Be Monitored
- MAC address table size/version
- dynamic MAC table count
- old-entry deletion mode
- spanning tree integration
- MAC table yellow/red threshold boundaries
- threshold-crossing trap count and frequency
Imported Objects
From CISCOSB-MIB
| switch001 | MODULE-IDENTITY |
From SNMPv2-SMI
| MODULE-IDENTITY | |
| OBJECT-TYPE |
From SNMPv2-TC
| TruthValue |
OIDs
RFC description
Cisco Small Business MIB for bridge MAC switching parameters and MAC table management.
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