5.2 STP Processes
5.2.8 Spanning-Tree example
In the Figure, you can analyze STP for the switch block using the following values:
  • The path cost from the workstation attached to S3 to the root switch is 110 (100 + 10).
  • The MAC address of the root switch is 00-00-08, whereas the designated-switch MAC address is 00-00-F9 (the lowest MAC address wins when defaults are used).
  • If an access switch has a lower MAC address, that switch becomes the root.