The network further includes a source of multicast packets in {HEAD ~ a multicast session} coupled to a first node of {TAIL ~ the long haul portion} 
The network further includes a source of multicast packets in { HEAD ~ a multicast session } coupled to a first node of { TAIL ~ the long haul portion }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL