{TAIL ~ The switch device} is arranged to route paths between the second interface and {HEAD ~ the first interface} 
{ TAIL ~ The switch device } is arranged to route paths between the second interface and { HEAD ~ the first interface }
TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD