H3C S5120-EI Series, Operation Manual

Page: 94 / 1191

1-17
Configuring MSTP
Configuring an MST Region
Make the following configurations on the root bridge and on the leaf nodes separately.
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-instance 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
Display the MST region
configurations that are not
activated yet
check region-configuration
Optional
Activate MST region
configuration manually
active region-configuration
Required
Display the configurations
of currently activated MST
regions
display stp region-configuration
The
display
command can
be executed in any view.
z
Two or more MSTP-enabled devices belong to the same MST region only if they are configured to
have the same format selector (0 by default, not configurable), MST region name, the same
VLAN-to-instance mapping entries in the MST region and the same MST region revision level, and
they are interconnected via a physical link.
z
The configuration of MST region–related parameters, especially the VLAN-to-instance 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 activate
the MST region–related parameters using the
active region-configuration
command, or enable
MSTP using the
stp enable
command in the case that MSTP is not enabled.