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| 3.8 |  | RSTP and MST Configuration |
| 3.8.7 |  | Configuring MST port priority |

If a loop occurs, the MSTP uses the port priority when selecting an interface to put into the Forwarding state. Assign higher priority values (lower numerical values) to interfaces that the network administrator wants selected first and lower priority values (higher numerical values) to interfaces that the administrator wants selected last. If all interfaces have the same priority value, the MSTP puts the interface with the lowest interface number in the Forwarding state and blocks the other interfaces.

Beginning in privileged EXEC mode, follow the steps outlined in Figure to configure the MSTP port priority of an interface.

The show spanning-tree mst interface interface-id privileged EXEC command displays information only if the port is in a link-up operative state. Use the show running-config interface privileged EXEC command to confirm the configuration.

To return the interface to its default setting, use the no spanning-tree mst instance-id port-priority interface configuration command.