1-17
Configuring the Root Bridge
Configuring an MST Region
Configuration procedure
Follow these steps to configure an MST region:
To do...
Use the command...
Remarks
Enter system view
system-view
—
Enter MST region view
stp region-configuration
—
Configure the MST region
name
region-name
name
Optional
The MST region name is the
MAC address by default.
instance
instance-id
vlan
vlan-list
Configure the
VLAN-to-MSTI mapping
table
vlan-mapping modulo
modulo
Optional
Use either command.
All VLANs in an MST region
are mapped to MSTI 0 by
default.
Configure the MSTP
revision level of the MST
region
revision-level
level
Optional
0 by default
Activate MST region
configuration manually
active region-configuration
Required
Display all the
configuration information of
the MST region
check region-configuration
Optional
Display the currently
effective MST region
configuration information
display stp region-configuration
The
display
command can
be executed in any view.
Two or more MSTP-enabled devices belong to the same MST region only if they are configured to have
the same MST region name, the same VLAN-to-MSTI mapping entries in the MST region and the same
MST region revision level, and they are interconnected via a physical link.
The configuration of MST region–related parameters, especially the VLAN-to-MSTI mapping table, will
cause MSTP to launch a new spanning tree calculation process, which may result in network topology
instability. To reduce the possibility of topology instability caused by configuration, MSTP will not
immediately launch a new spanning tree calculation process when processing MST region–related
configurations; instead, such configurations will take effect only after you:
z
activate the MST region–related parameters using the
active region-configuration
command, or
z
enable MSTP using the
stp enable
command in the case that MSTP is not enabled.
