Tagging can be used in {HEAD ~ lieu} of {TAIL ~ tunneling}, tagging a frame comprising a VPLS, or a MPLS identifier 
of
Tagging can be used in { HEAD ~ lieu } of { TAIL ~ tunneling } , tagging a frame comprising a VPLS , or a MPLS identifier
OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH