snmp-bridge-mib - Man Page

provide Linux bridge information via SNMP


snmp-bridge-mib {bridge}


The following arguments are required:


The name of the Linux bridge for which you want to provide information via SNMP, e.g. br0.


The snmp-bridge-mib is an extension to net-snmp. It collects information about a bridge in a Linux system and exports them for query from other (remote) systems for management purposes.


The preferred method of snmp-bridge-mib to attach to net-snmp is agentx. For this to work, you will have to add the following line to /etc/snmp/snmpd.conf,

    master agentx

restart snmpd and start snmp-bridge-mib. snmp-bridge-mib will then connect to the running snmpd daemon.

Another way of attaching snmp-bridge-mib to is to run it as an embedded perl module. You have to add

    perl do "path to location of snmp-bridge-mib"

and restart snmpd.


Follow the instructions in this manpage and type

    perl /usr/bin/snmp-bridge-mib br0

You´ll get the following output:

     registering at .
     running as a subagent.
     dot1qbridge agent started.
     NET-SNMP version AgentX subagent connected

Now it´s time for a first test:

    $ export MIBS=+BRIDGE-MIB
    $ snmpwalk localhost .

The output produced should look like

    BRIDGE-MIB::dot1dStpBridgeHelloTime = INTEGER: 199 centi-seconds
    BRIDGE-MIB::dot1dStpBridgeForwardDelay = INTEGER: 1499 centi-seconds
    BRIDGE-MIB::dot1dStpPort.1 = INTEGER: 1
    BRIDGE-MIB::dot1dStpPort.3 = INTEGER: 3
    BRIDGE-MIB::dot1dStpPortPriority.1 = INTEGER: 32
    BRIDGE-MIB::dot1dStpPortPriority.3 = INTEGER: 32
    BRIDGE-MIB::dot1dStpPortState.1 = INTEGER: disabled(1)
    BRIDGE-MIB::dot1dStpPortState.3 = INTEGER: disabled(1)
    BRIDGE-MIB::dot1dStpPortEnable.1 = INTEGER: disabled(2)
    BRIDGE-MIB::dot1dStpPortEnable.3 = INTEGER: disabled(2)
    BRIDGE-MIB::dot1dStpPortPathCost.1 = INTEGER: 2
    BRIDGE-MIB::dot1dStpPortPathCost.3 = INTEGER: 4
    BRIDGE-MIB::dot1dStpPortDesignatedRoot.1 = STRING: "8000.001018382c78"
    BRIDGE-MIB::dot1dStpPortDesignatedRoot.3 = STRING: "8000.001018382c78"
    BRIDGE-MIB::dot1dStpPortDesignatedCost.1 = INTEGER: 0
    BRIDGE-MIB::dot1dStpPortDesignatedCost.3 = INTEGER: 0
    BRIDGE-MIB::dot1dStpPortDesignatedBridge.1 = STRING: "8000.001018382c78"
    BRIDGE-MIB::dot1dStpPortDesignatedBridge.3 = STRING: "8000.001018382c78"
    BRIDGE-MIB::dot1dStpPortDesignatedPort.1 = STRING: "32769"
    BRIDGE-MIB::dot1dStpPortDesignatedPort.3 = STRING: "32770"
    BRIDGE-MIB::dot1dStpPortPathCost32.1 = INTEGER: 2
    BRIDGE-MIB::dot1dStpPortPathCost32.3 = INTEGER: 4
    BRIDGE-MIB::dot1dTpLearnedEntryDiscards = Counter32: 0
    BRIDGE-MIB::dot1dTpAgingTime = INTEGER: 300 seconds
    BRIDGE-MIB::dot1dTpFdbAddress.´...8,x´ = STRING: 0:10:18:38:2c:78
    BRIDGE-MIB::dot1dTpFdbAddress.´.!^/B|´ = STRING: 0:21:5e:2f:42:7c
    BRIDGE-MIB::dot1dTpFdbPort.´...8,x´ = INTEGER: 1
    BRIDGE-MIB::dot1dTpFdbPort.´.!^/B|´ = INTEGER: 3
    BRIDGE-MIB::dot1dTpFdbStatus.´...8,x´ = INTEGER: learned(3)
    BRIDGE-MIB::dot1dTpFdbStatus.´.!^/B|´ = INTEGER: learned(3)
    BRIDGE-MIB::dot1dTpPort.1 = INTEGER: 1
    BRIDGE-MIB::dot1dTpPort.3 = INTEGER: 3
    BRIDGE-MIB::dot1dTpPortMaxInfo.1 = INTEGER: 1500 bytes
    BRIDGE-MIB::dot1dTpPortMaxInfo.3 = INTEGER: 1500 bytes
    BRIDGE-MIB::dot1dTpPortInFrames.1 = Counter32: 18082 frames
    BRIDGE-MIB::dot1dTpPortInFrames.3 = Counter32: 1546072 frames
    BRIDGE-MIB::dot1dTpPortOutFrames.1 = Counter32: 11601 frames
    BRIDGE-MIB::dot1dTpPortOutFrames.3 = Counter32: 10988 frames
    BRIDGE-MIB::dot1dTpPortInDiscards.1 = Counter32: 0 frames
    BRIDGE-MIB::dot1dTpPortInDiscards.3 = Counter32: 0 frames


  1. snmp-bridge-mib currently only supports one bridge which has to be specified on the commandline.
  2. Not all elements of RFC 4188 because they are either not available in sysfs or difficult to extract from the existing data.

See Also

snmpd.conf(5), Net::SNMP(3)


Jens Osterkamp <>



26 Mar 2010 v6 Net-SNMP