The network device notifies {HEAD ~ one or more other network devices} in {TAIL ~ the network} that traffic that is received by the other network devices is to be routed to the network device 
in
The network device notifies { HEAD ~ one or more other network devices } in { TAIL ~ the network } that traffic that is received by the other network devices is to be routed to the network device
OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH