KB.15.15

Example 83 Sample output of the show spanning-tree root-history command for different

MSTP topologies

The following examples show sample output of the show spanning-tree root-history

command for different MSTP topologies. In each example, the root bridge ID is displayed in the

format: priority: mac-address

Where:

• priority is the MSTP switch priority calculated for one of the following:

• The IST (regional) root switch using the spanning-tree priority command

• An MSTI root switch using the spanning-tree instance priority command

• mac-address is the MAC address of the root (bridge) switch.

Example 84 Viewing show spanning-tree root-history CST output

Example 85 Viewing show spanning-tree root-history IST output

112 Multiple instance spanning tree operation