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This document describes the configuration of Ethernet services, including configuring link aggregation, VLANs, Voice VLAN, VLAN mapping, QinQ, GVRP, MAC table, STP/RSTP/MSTP, SEP, and so on.
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(Optional) Configuring the Root Bridge and Secondary Root Bridge
(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.
It is recommended that you specify the
root bridge and secondary root bridge when configuring STP/RSTP.
Procedure
Perform the following operations on the device you want
to use as the root bridge.
Run:
system-view
The system view is displayed.
Run:
stp root primary
The device is configured as the root bridge.
By default, a
switching device does not function as the root bridge. After you run
this command, the priority value of the device is set to 0 and cannot
be changed.
Perform the following operations on the device you want
to use as the secondary root bridge.
Run:
system-view
The system view is displayed.
Run:
stp root secondary
The device is configured as the secondary root bridge.
By
default, a switching device does not function as the secondary root
bridge. After you run this command, the priority value of the device
is set to 4096 and cannot be changed.