3com 4210 PWR 9-Port 3CR17341-91-ME 用户手册

C

HAPTER

 14: MSTP C

ONFIGURATION

[4210-mst-region] instance 2 vlan 20 to 30

 

[4210-mst-region] revision-level 1

 

[4210-mst-region] active region-configuration 

# Verify the above configuration.

[4210-mst-region] check region-configuration

 

Admin configuration

 

   Format selector    :0

 

   Region name        :info

 

   Revision level     :1

 

 
   Instance   Vlans Mapped

 

      0       11 to 19, 31 to 4094

 

      1       1 to 10

 

      2       20 to 30 

MSTP can automatically choose a switch as a root bridge through calculation. You 
can also manually specify the current switch as a root bridge by using the 
corresponding commands.

Using the stp root primary/stp root secondary command, you can specify the 
current switch as the root bridge or the secondary root bridge of the spanning tree 
instance identified by the instance-id argument. If the value of the instance-id 
argument is set to 0, the stp root primary/stp root secondary command specify 
the current switch as the root bridge or the secondary root bridge of the CIST.

A switch can play different roles in different spanning tree instances. That is, it can 
be the root bridges in a spanning tree instance and be a secondary root bridge in 
another spanning tree instance at the same time. But in the same spanning tree 
instance, a switch cannot be the root bridge and the secondary root bridge 
simultaneously.

Table 103   Specify the current switch as the root bridge of a spanning tree

Enter system view 

system-view 

- 

Specify the current switch as 
the root bridge of a spanning 
tree 

stp [ instance instance-id ] root 
primary [ bridge-diameter 
bridgenumber [ hello-time 
centi-seconds ] ] 

Required

Table 104   Specify the current switch as the secondary root bridge of a spanning tree

Enter system view 

system-view 

- 

Specify the current switch as 
the secondary root bridge of 
a specified spanning tree 

stp [ instance instance-id ] root 
secondary [ bridge-diameter 
bridgenumber [ hello-time 
centi-seconds ] ] 

Required