Stp Root Primary - Huawei quidway s3526 series Getting Started

Command Manual - STP
Quidway S3500 Series Ethernet Switches
If user doesn't input parameter "instance instance-id" when configuring switch, the
configuration will only be effective on CIST.
For the related command, see stp interface port priority.
Example
# Set the priority of Ethernet 0/3 on STI 2 to 16.
[Quidway-Ethernet0/3] stp instance 2 port priority 16

1.1.16 stp root primary

Syntax
stp [ instance instance-id ] root primary [ bridge-diameter bridgenum ] [ hello-time
centi-senconds ]
undo stp [ instance instance-id ] root
View
System view
Parameter
instance-id: Specifies the spanning tree instance ID, ranging from 0 to 16, instance 0 is
CIST.
root primary: Configure the current switch as the primary root of the designated STI.
bridge-diameter bridgenum: Specify the network diameter of the spanning tree,
ranging from 2 to 7.
hello-time centi-senconds: Specifies the Hello Time of the spanning tree, ranging from
100 to 1000 and measured in centiseconds.
Description
Using stp root primary command, you can configure the current switch as the primary
root of the designated STI. Using undo stp root command, you can cancel the current
switch for the primary root of the designated STI. If user doesn't input parameter
"instance instance-id" when configuring switch, the configuration will only be effective
on CIST.
By default, the switch does not server as a root bridge.
You can configure a root bridge for every STI without concerning the switch priority.
When configuring the root bridge, you may also specify the network diameter of the
designated switching network, so that the switch will calculate and get three time
parameter values (Hello time, Forward Delay and Max Age). The Hello time got in this
way may not be as good as expected. You can specify the hello-time centi-senconds
Huawei Technologies Proprietary
1-15
Chapter 1 MSTP Configuration Commands