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(Optional) Configuring the Root Bridge and Secondary Root Bridge
Context
MSTP can calculate the root bridge or you can manually configure the root bridge or secondary root bridge. Manually configuring the root bridge and secondary root bridge is recommended.
A
switch can function as a root bridge or a secondary root bridge in
a spanning tree. It can also function as the root bridge or secondary
root bridge of another spanning tree. In a spanning tree:
- Only one root bridge takes effect. If two or more root bridges are specified in a spanning tree, the device with the smallest MAC address is used.
- Multiple secondary root bridges can be specified. If the root bridge fails or is powered off and no new root bridge is specified, the secondary root bridge with smallest MAC address will become the root bridge of the spanning tree.