How to change STP priority from Mist Wired Assurance UI.

The bridge priority value along with the device MAC address forms the bridge ID, which determines the bridge to be elected as the root bridge in a Spanning Tree Protocol (STP) topology. The priority value is useful when two bridges have the same path cost to the root bridge.

To configure bridge priority on a switch:

- Click Switches to go to the list of switches.

- Click a switch to open it.

- The switch details page appears.

- Scroll down to the STP Bridge Priority tile in the Management section. You can also press CTR+F and look for STP Bridge Priority.

- Select a value from the Bridge Priority drop-down list.

- To save the changes, click Save on the upper right of the switch details page.

Note:

If you don't set the bridge priority (or select the value ‘none’), the default value (32,768) is configured.

The bridge priority can be set only in increments of 4096 (between 0 and 61,440).

We recommend that you set the lowest priority for the switch to be elected as root bridge.

2025-05-05 : Article Created

2026-06-19 : Added EX4400s to categories.

https://www.juniper.net/documentation/us/en/software/mist/mist-wired/topics/task/configure-bridge-priority.html