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(Optional) Configuring the Root Bridge and Secondary Root Bridge
Context
The root bridge of a spanning tree is automatically calculated.
You can also manually specify a root bridge or secondary root bridge.
- A spanning tree can have only one root bridge. When two or more devices are specified as root bridges for a spanning tree, the device with the smallest MAC address is elected as the root bridge.
- You can specify multiple secondary root bridges for each spanning tree. When the root bridge fails or is powered off, a secondary root bridge becomes the new root bridge unless a new root bridge is specified. If there are multiple secondary root bridges, the one with smallest MAC address becomes the root bridge of the spanning tree.
NOTE: It is recommended that you specify the
root bridge and secondary root bridge when configuring STP/RSTP.
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