The value of tmnxDot1agCfmMepMgmtFcltyVlanId specifies, along with
tmnxDot1agCfmMepMgmtFcltyIfIndex, the port or interface to which this
MEP is attached.
This object refers directly to
TIMETRA-IEEE8021-CFM-MIB::tmnxDot1agCfmMepFacilityVlanId.
This object must be specified during row creation when
tmnxDot1agCfmMepMgmtFcltyIfIndex is specified.