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

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Selecting STP Root

The STP determines the root bridge, but you can assign one bridge a lower priority to increase the likelihood that it becomes the root bridge. You can also specify that a bridge is the root or the secondary root.

To change the bridge priority or specify that a bridge is the root or secondary root, use the following command.
Assign a number as the bridge priority or designate it as the root or secondary root. PROTOCOL SPANNING TREE mode bridge-priority { priority-value | primary | secondary}
  • priority-value : the range is from 0 to 65535. The lower the number assigned, the more likely this bridge becomes the root bridge.
The primary option specifies a bridge priority of 8192. The secondary option specifies a bridge priority of 16384. The default is 32768.

Example of Viewing STP Root Information

To view only the root information, use the show spanning-tree root command from EXEC privilege mode. 
Dell#show spanning-tree 0 root
                                 Root ID Priority 32768, Address 0001.e80d.2462
                                 We are the root of the spanning tree
                                 Root Bridge hello time 2, max age 20, forward delay 15
                                 Dell#

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