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Dell EMC Configuration Guide for the S4048T–ON System 9.14.2.4

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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.

R3(conf-mstp)#msti 2 bridge-priority 0
1d2h51m: %RPM0-P:RP2 %SPANMGR-5-STP_ROOT_CHANGE: MSTP root changed for instance 2. My
Bridge ID: 0:0001.e809.c24a Old Root: 32768:0001.e806.953e New Root: 0:0001.e809.c24a

R3(conf-mstp)#show config
!
protocol spanning-tree mstp
  no disable
  MSTI 1 VLAN 100
  MSTI 2 VLAN 200,300
  MSTI 2 bridge-priority 0

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