Specify The Switch As Primary Or Secondary Root Bridge - Huawei Quidway S6500 Series Operation Manual

Operation Manual - STP
Quidway S6500 Series Ethernet Switches
Table 1-3 Activate the MST Region Configuration and exit the MST Region View
Show the configuration information of the MST
region under revision (from MST region view)
Manually activate the MST region configuration
(from MST region view)
Exit MST region view (from MST region view)

1.2.2 Specify the Switch as Primary or Secondary Root bridge

MSTP can determine the spanning tree root through calculation. You can also specify
the current switch as the root, using the command provided by the switch.
You can use the following commands to specify the current switch as the primary or
secondary root of the spanning tree.
Perform the following configuration in system view.
Table 1-4 Specify the switch as primary or secondary root bridge
Specify current switch as the primary
root bridge of the specified spanning
tree.
Specify current switch as the secondary
root bridge of the specified spanning
tree.
Specify current switch not to be the
primary or secondary root.
After a switch is configured as primary root bridge or secondary root bridge, user can't
modify the bridge priority of the switch.
You can configure the current switch as the primary or secondary root bridge of the STI
(specified by the instance instance-id parameter). If the instance-id takes 0, the current
switch is specified as the primary or secondary root bridge of the CIST.
The root types of a switch in different STIs are independent of one another. The switch
can be a primary or secondary root of any STI. However, it cannot serve as both the
primary and secondary roots of one STI.
If the primary root is down or powered off, the secondary root will take its place, unless
you configure a new primary root. Of two or more configured secondary root bridgees,
MSTP selects the one with the smallest MAC address to take the place of the failed
primary root.
Operation
Operation
Huawei Technologies Proprietary
1-12
Chapter 1 MSTP Region-configuration
Command
check region-configuration
active region-configuration
quit
Command
stp [ instance instance-id ] root
primary
stp [ instance instance-id ] root
secondary
undo stp [ instance instance-id ] root