3Com 4210 PWR Configuration Manual page 158

156 C 14: MSTP C
HAPTER
Specifying the Current
Switch as a Root
Bridge/Secondary Root
Bridge
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
Region name
Revision level
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.
Specify the current switch as the root bridge of a spanning tree
Table 103 Specify the current switch as the root bridge of a spanning tree
Operation
Enter system view
Specify the current switch as
the root bridge of a spanning
tree
Specify the current switch as the secondary root bridge of a spanning tree
Table 104 Specify the current switch as the secondary root bridge of a spanning tree
Operation
Enter system view
Specify the current switch as
the secondary root bridge of
a specified spanning tree
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.
:0
:info
:1
Command
system-view
stp [ instance instance-id ] root
primary [ bridge-diameter
bridgenumber [ hello-time
centi-seconds ] ]
Command
system-view
stp [ instance instance-id ] root
secondary [ bridge-diameter
bridgenumber [ hello-time
centi-seconds ] ]
Description
-
Required
Description
-
Required