---
name: "snmp_bridge"
section: "3"
platform: "freebsd"
package: "base"
version: "16.0-CURRENT-20261027-61c70dc16a79"
release: "FreeBSD 16.0-CURRENT (2026-10-27)"
platforms: ["freebsd"]
url: "https://new.carta.tech/snmp_bridge"
---

# snmp\_bridge(3)

bridge module for snmpd

## NAME

**snmp\_bridge** – bridge module for snmpd

## LIBRARY

(begemotSnmpdModulePath."bridge" = /usr/lib/snmp\_bridge.so)

## DESCRIPTION

The **snmp\_bridge** module implements the BRIDGE-MIB as standardized in RFC 4188, the RSTP-MIB standardized in RFC4318 and a private BEGEMOT-BRIDGE-MIB, which allows management of multiple bridge interfaces. Most of the objects defined in the private BEGEMOT-BRIDGE-MIB are duplicates of the original objects defined by the standard BRIDGE-MIB, but the private MIB also defines additional objects which make the functionality of **snmp\_bridge** similar to [ifconfig(8)](/ifconfig/8.md) for configuring bridge interfaces. Therefore one should consider adding write communities or loading the **snmp\_bridge** module on systems where security is crucial.

## IMPLEMENTATION NOTES

The additional objects to configure a bridge are:

- *begemotBridgeBaseStatus*

  Bridge interfaces can be created and destroyed via this object. SNMP SET operations with the following values are allowed:

  - *createAndWait*

    will attempt to create a bridge interface with the name given by the table index.

  - *createAndGo*

    will attempt to create a bridge interface with the name given by the table index and set the status of the interface to "active/up".

  - *destroy*

    will attempt to destroy the bridge interface.

- *begemotBridgeBaseSpanEnabled*

  A SNMP SET operation on this object is only successful if the corresponding port has not been added as member of the bridge interface on the system.

- *begemotBridgeBasePortStatus*

  SNMP SET operations with the following values are allowed:

  - *createAndWait*

    will create a new row for the bridge member in the SNMP *begemotBridgeBasePortTable* but will not try to commit the information to the system.

  - *active*

    will attempt to commit the information to the system and will be successful only if a value for *begemotBridgeBaseSpanEnabled* has been SET already.

  - *destroy*

    will attempt to remove the interface from the system bridge interface.

- *begemotBridgeBasePortPrivate*

  This object controls a bridge interface flag called PRIVATE where any private port can not communicate with another private port.

## RESTRICTIONS

Not all information in the MIBs is currently available in FreeBSD. The following variables carry no information:

- *dot1dBasePortCircuit*

  - *dot1dBasePortDelayExceededDiscards*

  - *dot1dBasePortMtuExceededDiscards*

  - *begemotBridgeBasePortDelayExceededDiscards*

  - *begemotBridgeBasePortMtuExceededDiscards*

  ## FILES

- */usr/share/snmp/defs/bridge\_tree.def*

  The description of the MIB tree implemented by **snmp\_bridge**.

- */usr/share/snmp/mibs/BRIDGE-MIB.txt*

  This is the BRIDGE-MIB that is implemented by this module.

- */usr/share/snmp/mibs/RSTP-MIB.txt*

  This is the RSTP-MIB implemented by this module.

- */usr/share/snmp/mibs/BEGEMOT-BRIDGE-MIB.txt*

  This is the private BEGEMOT-BRIDGE-MIB that is implemented by this module.

## SEE ALSO

[bsnmpd(1)](/bsnmpd/1.md), [gensnmptree(1)](/gensnmptree/1.md), [snmpmod(3)](/snmpmod/3.md), [if\_bridge(4)](/if_bridge/4.md), [ifconfig(8)](/ifconfig/8.md)

## AUTHORS

Shteryana Shopova ⟨*syrinx@FreeBSD.org*⟩