The value of svcTlsBackboneForceQTagFwd specifies
whether to enable addition of an IEEE 802.1q tag
after the Customer MAC address when the PBB header is
built, as it egresses related 'b-vpls' service.
An 'inconsistentValue' error is returned when the value
of this object is set to the non-default value and
svcVplsType of this service is not set to 'i-vpls'.