SNMP_BRIDGE(3)

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) 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), gensnmptree(1), snmpmod(3), if_bridge(4), ifconfig(8)

AUTHORS
Shteryana Shopova <syrinx@FreeBSD.org>