The routing data identifies one of the plurality of data ports through which the data frame will exit {HEAD ~ the switching fabric} to reach {TAIL ~ the destination device} 
to reach
The routing data identifies one of the plurality of data ports through which the data frame will exit { HEAD ~ the switching fabric } to reach { TAIL ~ the destination device }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL