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