RC-BRIDGE-MIB

MIB Reference — IPNetwork Monitor · Updated September 14, 2026

All MIBsRC-BRIDGE-MIB

Organization: Bay Networks, Rapid-City Group

Last Updated: 2008-06-27

Category: Nortel Enterprise Data, Spanning Tree

Description: Manages bridge forwarding database, spanning tree, and MAC learning on Bay Networks Rapid-City series switches.

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What Is RC-BRIDGE-MIB?

RC-BRIDGE-MIB is a Bay Networks/Nortel enterprise MIB ("Rapid-City"/Accelar product family) that manages 802.1D bridging behavior on switches, covering Spanning Tree Group (STG) configuration, bridge addresses, port counts, and MAC address forwarding/learning. It exposes both configuration data (max/current number of spanning tree groups, per-STG bridge address, protocol specification, priority) and operational status (unassigned ports, tagged BPDU addressing) used to manage Layer 2 topology. For monitoring purposes it is primarily about software/configuration status rather than raw hardware sensors: it lets an operator confirm spanning tree group assignments are correct and stable, which is critical to detecting loops, unexpected topology changes, or misconfigured VLAN-to-STG mappings on the switch. It parallels and extends the standard IETF BRIDGE-MIB (dot1d) concepts but is implemented as a Nortel/Bay proprietary enterprise MIB for the Accelar/Passport switch family. It is deployed on Bay Networks/Nortel Rapid-City-based Ethernet switches supporting multiple spanning tree instances (VLAN-based). Network engineers evaluating or troubleshooting this functionality can download the RC-BRIDGE-MIB file directly to load it into their MIB browser.

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

  • Bay Networks/Nortel Rapid-City Accelar switch
  • Nortel Passport switch family

Monitoring Examples

An administrator polls rcStgTable/rcStgEntry, indexed by rcStgId, to check rcStgBridgeAddress, rcStgNumPorts, and rcStgPriority for each spanning tree group, comparing against rcStgMaxStgs and rcStgNumStgs to confirm the expected number of STGs are configured. If a VLAN's traffic stops forwarding as expected, the admin checks rcStgUnassignedPorts to see whether a port failed to get assigned to any spanning tree group, or reviews rcStgProtocolSpecification to confirm the correct STP variant (e.g. RSTP vs classic STP) is active for that group.

What Can Be Monitored

  • spanning tree group count/assignment
  • bridge address per STG
  • unassigned ports
  • STP protocol specification and priority
Imported Objects

From BRIDGE-MIB

BridgeId
Timeout

From IF-MIB

InterfaceIndex

From RAPID-CITY

EnableValue
IdList
PortSet
rcBridgeOBJECT-IDENTITY
rcStgOBJECT-IDENTITY

From SNMPv2-SMI

Counter32
Integer32
MODULE-IDENTITY
OBJECT-TYPE
TimeTicks

From SNMPv2-TC

MacAddress
RowStatus
TruthValue

How to Use in IPNetwork Monitor

Example using rcStgTopChanges OID:

Select a Nortel/Bay Networks switch 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 rcStgTopChanges 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 total number of topology changes detected by this bridge since the management entity was last reset or initialized. 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

Bay Networks Rapid-City bridge enterprise MIB for managing spanning tree groups, forwarding database, and rate limiting on Accelar products.

Start monitoring Nortel/Bay Networks switches 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 RC-BRIDGE-MIB