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Dell EMC Configuration Guide for the S4048T–ON System 9.14.2.4

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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.
DellEMC#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
DellEMC#

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