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Dell PowerEdge FN I/O Module Configuration Guide 9.10(0.0)

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Influencing MSTP Root Selection

MSTP determines the root bridge, but you can assign one bridge a lower priority to increase the probability that it becomes the root bridge.

To change the bridge priority, use the following command.
Assign a number as the bridge priority. PROTOCOL MSTP mode msti instance bridge-priority priority A lower number increases the probability that the bridge becomes the root bridge. The range is from 0 to 61440, in increments of 4096. The default is 32768.

Example of Assigning and Verifying the Root Bridge Priority

By default, the simple configuration shown previously yields the same forwarding path for both MSTIs. The following example shows how R3 is assigned bridge priority 0 for MSTI 2, which elects a different root bridge than MSTI 2.

To view the bridge priority, use the show config command from PROTOCOL MSTP mode. 

Dell(conf-mstp)#msti 2 bridge-priority 0
                                 
                                 Dell(conf-mstp)#show config
                                 !
                                 protocol spanning-tree mstp
                                 MSTI 2 bridge-priority 0
                                 Dell(conf-mstp)#

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