5
Destination Addressing
•In a
regular topology the switches can compute the path to the destination based only on its
address
•Fitting the destination address into the first phit
allows the node to begin addressing immediately
•For
irregular networks packets are “source routed” -- the path to the destination is computed at the
source, and prefixed to the information
•At
each hop its own address is removed from the front
Source routing sets path w/o
considering congestion