When the data pass the Switch in port can represent cost value?

The snapshot is a tutorial of Switch.

You see the bellow snapshot, from the ROOT SW1 node to SW3, there are two path:

the author says the the path1(left side path) cost is 0 + SW3-in-port. the path2(right side path) cost is 0 + SW2-in-port + SW3-in-port.

there I have a doubt, why author do not use the passing Switches node as the cost value? if the data passing port can represent cost, why the Switch out port do not have value?

Leave Your Comment