Specifying The Current Switch As A Root Bridge/Secondary Root Bridge - 3Com 4200G 12-Port Configuration Manual

configuration, MSTP does not recalculate spanning trees immediately after the configuration; it does
this only after you perform one of the following operations, and then the configuration can really takes
effect:
Activate the new MST region-related settings by using the active region-configuration command
Enable MSTP by using the stp enable command
MSTP-enabled switches are in the same region only when they have the same format selector (a
802.1s-defined protocol selector, which is 0 by default and cannot be configured), MST region
name, VLAN-to-MSTI mapping table, and revision level.
The 3com switches support only the MST region name, VLAN-to-MSTI mapping table, and revision
level. Switches with the settings of these parameters being the same are assigned to the same
MST region.
Configuration example
# Configure an MST region named info, the MSTP revision level being level 1, VLAN 2 through VLAN
10 being mapped to MSTI 1, and VLAN 20 through VLAN 30 being mapped to MSTI 2.
<Sysname> system-view
[Sysname] stp region-configuration
[Sysname-mst-region] region-name info
[Sysname-mst-region] instance 1 vlan 2 to 10
[Sysname-mst-region] instance 2 vlan 20 to 30
[Sysname-mst-region] revision-level 1
[Sysname-mst-region] active region-configuration
# Verify the above configuration.
[Sysname-mst-region] check region-configuration
Admin configuration
Format selector
Region name
Revision level
Instance
0
1
2

Specifying the Current Switch as a Root Bridge/Secondary Root Bridge

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
Follow these steps to specify the current switch as the root bridge of a spanning tree:
:0
:info
:1
Vlans Mapped
1, 11 to 19, 31 to 4094
2 to 10
20 to 30
1-17