The value of vRtrLdpSessBfdStatus indicates the BFD operational
status for the LDP session.
If the value of vRtrLdpSessBfdStatus is 'noService', BFD is
not enabled for the LDP session. If the value of the object is
'outOfService', BFD is enabled but it is down and not running.
If the value of object is 'inService', BFD is enabled and it is
running.