HP A5120 EI Series

69
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.
Configure the VLAN-to-instance
mapping table
instance instance-id vlan vlan-list
Optional
Use either command.
All VLANs in an MST region are
mapped to the CIST (or MSTI 0)
by default.
vlan-mapping modulo modulo
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 activated
configuration information of the
MST region
display stp region-configuration [
| { begin | exclude | include }
regular-expression ]
Optional
Available in any view
NOTE:
 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, VLAN-to-instance mapping entries in the MST
region, and MST region revision level, and they are connected via a physical link.
 The configuration of MST region–related parameters, especially the VLAN-to-instance mapping table, will cause
MSTP to begin a new spanning tree calculation process, which might result in network topology instability. To
reduce the possibility of topology instability caused by configuration, MSTP does not immediately begin a new
spanning tree calculation process when it is processing MST region–related configurations. Instead, such
configurations takes effect only after you activate the MST region–related parameters by using the active region-
configuration command, or enable MSTP by using the stp enable command if MSTP is disabled.
Configuring the root bridge or a secondary root bridge
You can have MSTP determine the root bridge of a spanning tree through MSTP calculation, or you can
specify the current device as the root bridge or as a secondary root bridge using the commands that the
system provides.