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