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