R3166-R3206-HP High-End Firewalls Network Management Configuration Guide-6PW101

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To do... Use the command... Remarks
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
Or
vlan-mapping modulo modulo
Optional
Use either command.
All VLANs in an MST region are
mapped to the CIST (or 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 activated
configuration
information of the MST
region
display stp region-configuration
Optional
Available in any view.
NOTE:
• Two or more spanning tree devices belon
g
to the same MST re
g
ion only if they are confi
g
ured to have
the same format selector (0 by default, not configurable), MST region name, MST re
g
ion revision level,
and the same VLAN-to-instance mapping entries in the MST region, and they are interconnected via a
physical link.
• The configuration of MST region–related parameters, especially the VLAN-to-instance mappin
g
table,
will result in a new spanning tree calculation. To reduce the possibility of topology instability, the MST
region configuration takes effect only after you activate it by using the active region-configuration
command, or enable a spanning tree protocol by using the stp enable command in the case that the
spanning tree protocol is disabled.
Configuring the root bridge or a secondary root bridge
The root bridge of a spanning tree is determined through spanning tree calculation. Alternatively, you
can specify the current device as the root bridge or a secondary root bridge.
A device has independent roles in different spanning trees. It can act as the root bridge in one spanning
tree and as a secondary root bridge in another. However, a device cannot be the root bridge and a
secondary root bridge in the same spanning tree.
A spanning tree can have one root bridge only. If two or more devices are selected as the root bridge in
a spanning tree at the same time, the device with the lowest MAC address wins out.
When the root bridge of an instance fails or is shut down, the secondary root bridge (if you have
specified one) can take over the role of the primary root bridge. However, if you specify a new primary
root bridge for the instance then, the secondary root bridge will not become the root bridge. If you have