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SNMP Bridge MIB support #496
Description
Of all things SNMP, the BRIDGE-MIB is one of the most useful features. With #1651 merged, the BRIDGE-MIB is closer than ever. Checking what statd already publishes, most of it is there:
dot1dStp*— state, role, port-id, designated bridge, topology changes: all presentdot1qVlanCurrentTable/VlanStaticTableanddot1qPortVlanTable— VLAN membership and PVID: presentdot1dBasePortTable— falls out of every port being a netdev with anif-index
What's genuinely missing is the FDB (dot1dTpFdbTable, dot1qTpFdbTable) and dot1dTpAgingTime. Neither infix-if-bridge.yang nor statd has any notion of a forwarding database.
Additional Information
Some research on this topic:
Activity
troglobit commentedon Sep 22, 2026
Read-only SNMP support is in flight: an agent configured from
ietf-snmp(RFC 7407), serving SNMPv2-MIB, IF-MIB, HOST-RESOURCES-MIB, UCD-SNMP-MIB and
LLDP-MIB. Notes on what BRIDGE-MIB needs on top of that, so this can be
scheduled.
The agent is no longer the hard part
confd starts snmpd with
master agentxand lldpd already attaches to it toserve LLDP-MIB, so a subagent registering the bridge subtrees has somewhere to
plug in. net-snmp ships neither BRIDGE-MIB nor Q-BRIDGE-MIB in any build
configuration, and the three implementations linked above are unmaintained, so
this is ours to write regardless.
Most of the data is already in the operational datastore
dot1dBasePortTableif-indexdot1dStp*dot1qVlanCurrentTable,dot1qVlanStaticTabledot1qPortVlanTable(PVID)dot1dTpFdbTable,dot1qTpFdbTabledot1dTpAgingTimeSo the prerequisite is the forwarding database
There is no FDB in
infix-if-bridgeor in the operational datastore today.bridge -j fdb showgives it directly and nothing reads it yet, so theplumbing is small. The open question is modelling: we import
ieee802-dot1q-typesbut notieee802-dot1q-bridge, which carriesfiltering-database/filtering-entry. Worth deciding whether to adopt thatsubtree or put the FDB in
infix-if-bridge.That is worth having on its own merits, independent of SNMP. A MAC table over
NETCONF/RESTCONF and a
show bridge fdbin the CLI get asked for regularly.Suggest splitting it into its own issue and making this one depend on it.
Suggested order
ietf-hardware, which overlaps Add system resource monitoring RESTCONF/NETCONF notifications (CPU, memory, disk, ...) #1102show bridge fdb#1653