All MIBs › RFC1493-MIB
Organization: IETF Bridge MIB Working Group
Last Updated: 1993-07-31
Description: Compatibility stub for the no-hyphen RFC1493-MIB form of the IEEE 802.1D BRIDGE-MIB, providing dot1dBasePort, MacAddress, BridgeId, and Timeout for bridge and switch MIBs
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What Is RFC1493-MIB?
RFC1493-MIB is a vendor-neutral compatibility stub that re-exposes core objects from the IEEE 802.1D Bridge MIB (RFC 1493/4188) under a hyphen-free module name, for tooling or agents that expect this alternate naming form. It covers fundamental transparent bridging concepts: base bridge identity, bridge ports, and their associated MAC addresses and aging timeouts. Its use in monitoring is centered on Layer 2 bridging/switching software status—confirming a device's bridge identifier, verifying which physical ports are mapped to which bridge ports, and checking learned MAC address aging behavior—rather than any deeper hardware health data. It exists specifically because it duplicates/depends on the canonical BRIDGE-MIB (RFC 1493/4188), acting as a naming-compatible stub for that same functionality, and the RFC1493-MIB RFC lineage (original RFC 1493, later obsoleted by RFC 4188) explains why this module's objects mirror the standard BRIDGE-MIB so closely. It would be found on any Ethernet switch or bridge implementing standard 802.1D bridging that also ships this alternate-named stub for backward-compatible tool support.
IPNetwork Monitor allows you to monitor SNMP objects defined in RFC1493-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/bridges implementing IEEE 802.1D transparent bridging
Monitoring Examples
An administrator or tool would poll dot1dBase and its dot1dBasePort objects to enumerate a switch's bridge ports and confirm each is correctly mapped to a MacAddress and physical interface. Checking dot1dBridge-level identity objects (BridgeId) confirms the device's bridging identity is as expected in spanning-tree or bridge-table diagnostics. Because this is a compatibility stub, any anomaly found here mirrors what would be seen in the standard BRIDGE-MIB rather than exposing anything unique to this module.
What Can Be Monitored
- bridge port to interface mapping
- learned MAC addresses per port
- bridge identifier
- MAC address aging timeout
Imported Objects
From SNMPv2-SMI
| Integer32 | |
| MODULE-IDENTITY | |
| OBJECT-TYPE | |
| mib-2 |
From SNMPv2-TC
| TEXTUAL-CONVENTION |
OIDs
FAQ
When would a tool query RFC1493-MIB instead of BRIDGE-MIB directly?
RFC1493-MIB is a compatibility stub that re-exposes the same core IEEE 802.1D bridging objects — bridge identifier, bridge ports, MAC addresses, aging timeouts — under a hyphen-free module name, for agents or tools that expect this alternate naming form.
What would I monitor with RFC1493-MIB on an Ethernet switch?
The bridge port-to-interface mapping, learned MAC addresses per port, the bridge identifier, and MAC address aging timeout — confirming Layer 2 bridging/switching software state rather than any hardware health data.
RFC description
Defines managed objects for IEEE 802.1D MAC bridges, including spanning tree protocol configuration, port state, and forwarding database management as specified in RFC 1493.
Start monitoring vendor-neutral, standards-based MIB, Ethernet switches/bridges implementing IEEE 802.1D transparent bridging 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.