ENTERASYS-IETF-BRIDGE-MIB-EXT-MIB

MIB Reference — IPNetwork Monitor · Updated October 05, 2026

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Organization: Enterasys Networks, Inc

Last Updated: 2007-07-31

Category: Protocol: STP, Technology: Bridging, Vendor: Enterasys/Cabletron

Description: Enterasys Networks proprietary extension to the IETF BRIDGE-MIB (RFC 1493) for STP and forwarding database management.

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What Is ENTERASYS-IETF-BRIDGE-MIB-EXT-MIB?

ENTERASYS-IETF-BRIDGE-MIB-EXT-MIB (module identity etsysIetfBridgeMibExtMIB) is an Enterasys Networks vendor-specific MIB that extends the standard IETF BRIDGE-MIB (RFC 1493) with proprietary Spanning Tree and forwarding-database objects. Its etsysIetfBridgeDot1dStpPortTable AUGMENTS dot1dStpPortEntry with per-port STP enable/disable control (etsysIetfBridgeDot1dStpPortStpEnable), SpanGuard blocking state (etsysIetfBridgeDot1dStpPortSpanGuardBlocking), and CIST (Common and Internal Spanning Tree) role (etsysIetfBridgeDot1dStpPortCistRoleValue: disabled/root/designated/alternate/backUp) and non-forwarding-reason objects, while separate branches cover SpanGuard, Backup Root, and Loop Protect feature configuration, plus moved-address and new-learned-address notifications tied to the standard dot1qTpFdbPort forwarding database. This makes it useful for monitoring Enterasys-specific spanning-tree resiliency features — detecting when SpanGuard has blocked a port to prevent an unauthorized bridge from participating in STP, tracking each port's CIST role for topology verification, and catching forwarding-database anomalies via moved/new-address traps — beyond what the base BRIDGE-MIB exposes. It depends on the standard BRIDGE-MIB, P-BRIDGE-MIB (EnabledStatus), and Q-BRIDGE-MIB (dot1qTpFdbPort) it augments/extends, and network engineers can consult the ENTERASYS-IETF-BRIDGE-MIB-EXT-MIB reference when correlating these extension objects back to base bridge port indices.

IPNetwork Monitor allows you to monitor SNMP objects defined in ENTERASYS-IETF-BRIDGE-MIB-EXT-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

  • Enterasys Networks switches supporting IEEE 802.1D/802.1Q bridging extensions

Monitoring Examples

An operator polls etsysIetfBridgeDot1dStpPortSpanGuardBlocking for a set of access ports and cross-references etsysIetfBridgeDot1dStpPortCistRoleValue; a port unexpectedly showing SpanGuard blocking as true alongside a role of disabled would indicate an unauthorized switch or BPDU source was detected and isolated on that port.

What Can Be Monitored

  • per-port Spanning Tree enable/disable state
  • SpanGuard blocking status per port
  • CIST port role and non-forwarding reason
  • Backup Root and Loop Protect feature configuration
  • moved-address and new-learned-address notifications
Imported Objects

From BRIDGE-MIB

dot1dBaseBridgeAddressOBJECT-TYPE
dot1dBasePortOBJECT-TYPE
dot1dBasePortEntryOBJECT-TYPE
dot1dBasePortIfIndexOBJECT-TYPE
dot1dStpDesignatedRootOBJECT-TYPE
dot1dStpPort
dot1dStpPortEntry

From ENTERASYS-MIB-NAMES

etsysModulesOBJECT-IDENTITY

From P-BRIDGE-MIB

EnabledStatus

From Q-BRIDGE-MIB

dot1qTpFdbPortOBJECT-TYPE

From SNMPv2-CONF

MODULE-COMPLIANCE
NOTIFICATION-GROUP
OBJECT-GROUP

From SNMPv2-SMI

Integer32
MODULE-IDENTITY
NOTIFICATION-TYPE
OBJECT-TYPE
Unsigned32

From SNMPv2-TC

TruthValue
OIDs

RFC description

Extends IETF Bridge MIB with Enterasys proprietary bridging features and spanning tree enhancements.

Start monitoring Enterasys Networks switch (legacy, later Extreme Networks) (BRIDGE-MIB extensions: SpanGuard/Loop Protect) 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.

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