Configuring Mstp; Configuring An Mst Region; Configuring The Root Bridge Or A Secondary Root Bridge - HP A5120 EI Series Configuration Manual

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...
Enter system view
Enter MST region view
Configure the MST region name
Configure the VLAN-to-instance
mapping table
Configure the MSTP revision level
of the MST region
Display the MST region
configurations that are not
activated yet
Activate MST region configuration
manually
Display the activated
configuration information of the
MST region
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.
Use the command...
system-view
stp region-configuration
region-name name
instance instance-id vlan vlan-list
vlan-mapping modulo modulo
revision-level level
check region-configuration
active region-configuration
display stp region-configuration [
| { begin | exclude | include }
regular-expression ]
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Remarks
—
—
Optional
The MST region name is the MAC
address by default.
Optional
Use either command.
All VLANs in an MST region are
mapped to the CIST (or MSTI 0)
by default.
Optional
0 by default.
Optional
Required
Optional
Available in any view