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