sending {HEAD ~ an initial request} from the device to {TAIL ~ the first ingress router} prior to migrating to the second routing domain, the request to buffer the received packets in advance of migrating 
to
sending { HEAD ~ an initial request } from the device to { TAIL ~ the first ingress router } prior to migrating to the second routing domain , the request to buffer the received packets in advance of migrating
OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH