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

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Influencing RSTP Root Selection

RSTP determines the root bridge, but you can assign one bridge a lower priority to increase the likelihood that it is selected as the root bridge.

To change the bridge priority, use the following command.
Assign a number as the bridge priority or designate it as the primary or secondary root. PROTOCOL SPANNING TREE RSTP mode bridge-priority priority-value
  • priority-value The range is from 0 to 65535. The lower the number assigned, the more likely this bridge becomes the root bridge.
The default is 32768. Entries must be multiples of 4096.

Example of the bridge-priority Command

A console message appears when a new root bridge has been assigned. The following example example shows the console message after the bridge-priority command is used to make R2 the root bridge (shown in bold). 
Dell(conf-rstp)#bridge-priority 4096
                                 04:27:59: %RPM0-P:RP2 %SPANMGR-5-STP_ROOT_CHANGE: RSTP root changed. My Bridge ID:
                                 4096:0001.e80b.88bd 
                                 Old Root: 32768:0001.e801.cbb4 New Root: 4096:0001.e80b.88bd

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