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