3Com Switch 7750 Configuration Guide

248 CHAPTER 30: MSTP CONFIGURATION
Configuring MST region-related parameters (especially the VLAN mapping table)
results in spanning trees being regenerated. To reduce network topology jitter
caused by the configuration, MSTP does not regenerate 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:
■ Activating the new MST region-related settings by using the active
region-configuration command
■ Enabling MSTP by using the stp enable command
n
Switches belong to the same MST region only when they have the same MST
region name, VLAN mapping table, and MSTP revision level.
Configuration example
# Configure an MST region, with the name being “info”, the MSTP revision level
being level 1, VLAN 2 through VLAN 10 being mapped to spanning tree instance
1, and VLAN 20 through VLAN 30 being mapped to spanning tree 2.
<SW7750> system-view
[SW7750] stp region-configuration
[SW7750-mst-region] region-name info
[SW7750-mst-region] instance 1 vlan 2 to 10
[SW7750-mst-region] instance 2 vlan 20 to 30
[SW7750-mst-region] revision-level 1
[SW7750-mst-region] active region-configuration
# Verify the above configuration.
[SW7750-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
11to10
2 20 to 30
Configure the MSTP
revision level for the
MST region
revision-level level Required
The default revision level of an
MST region is level 0.
Activate the
configuration of the
MST region manually
active region-configuration Required
Display the
configuration of the
current MST region
check region-configuration Optional
Display the currently
valid configuration of
the MST region
Display stp
region-configuration
You can execute this command in
any view.
Table 172 Configure an MST region
Operation Command Description