Specify The Switch As Primary Or Secondary Root Switch - Huawei Quidway S3500 Series Operation Manual

Operation Manual - STP
Quidway S3500 Series Ethernet Switches
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 Switch

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 switch
Specify current switch as the
primary root switch of the
specified spanning tree.
Specify current switch as the
secondary root switch of the
specified spanning tree.
Specify current switch not to be
the primary or secondary root.
After a switch is configured as primary root switch or secondary root switch, user can't
modify the bridge priority of the switch.
You can configure the current switch as the primary or secondary root switch 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 switch 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 switches,
MSTP selects the one with the smallest MAC address to take the place of the failed
primary root.
When configuring the primary and secondary switches, you can also configure the
network diameter and hello time of the specified switching network. For detailed
Operation
Operation
Huawei Technologies Proprietary
Chapter 1 MSTP Region-configuration
active region-configuration
quit
Command
stp [ instance instance-id ] root primary
[ bridge-diameter bridgenum ] [ hello-time
centi-senconds ]
stp [ instance instance-id ] root secondary
[ bridge-diameter bridgenum ] [ hello-time
centi-senconds ]
undo stp [ instance instance-id ] root
1-12
Command