snmp-bridge-mib man page

snmp-bridge-mib — 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:

$ 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