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