3Com 8800 Configuration Manual page 549

3Com Switch 8800 Configuration Guide
Table 38-1 Enter MST region view
Enter MST region view (from system view)
Restore the default settings of MST region
II. Configuring parameters for the MST region
Perform the following configuration in MST region view.
Table 38-2 Configure the MST region for a switch
Configure the MST region name
Restore the default MST region name
Configure VLAN mapping table
Restore the default VLAN mapping
table
Configure the MSTP revision level of
MST region
Restore the MSTP revision level of
MST region
An MST region can contain up to 49 spanning tree instances, among which the
Instance 0 is IST and the Instances 1 through 48 are MSTIs. Upon the completion of the
above configurations, the current switch is put into a specified MST region. Note that
two switches belong to the same MST region only if they have been configured with the
same MST region name, STI-VLAN mapping tables of an MST region, and the same
MST region revision level.
Configuring the related parameters, especially the VLAN mapping table, of the MST
region, will lead to the recalculation of spanning tree and network topology flapping. To
bate such flapping, MSTP triggers to recalculate the spanning tree according to the
configurations only if one of the following conditions is met:
A user manually activates the configured parameters related to the MST region,
using the active region-configuration command.
A user enables MSTP using the stp enable command.
By default, the MST region name is the switch MAC address, all the VLANs in the MST
region are mapped to the STI 0, and the MSTP region revision level is 0. You can
restore the default settings of MST region, using the undo stp region-configuration
command in system view.
Operation
Operation
38-14
Chapter 38 MSTP Region-configuration
Command
stp region-configuration
undo stp region-configuration
Command
region-name name
undo region-name
instance instance-id vlan vlan-list
undo instance instance-id [ vlan vlan-list ]
revision-level level
undo revision-level