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