H3C Technologies H3C S12500-X Series Switches - Manual (Page 88)

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NOTE:
•
In STP or RSTP mode, do not specify an MSTI. Otherwise, the spanning tree configuration does not take
effect.
• In MSTP mode, if you specify an MSTI, the spanning tree configuration takes effect on the specified MSTI.
If you do not specify an MSTI, the spanning tree configuration takes effect on the CIST.
Configuring an MST region
Two or more spanning tree 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, MST region revision level, and
the same VLAN-to-instance mapping entries in the MST region, and they are connected through a
physical link.
The configuration of MST region-related parameters (especially the VLAN-to-instance mapping table)
might cause MSTP to begin 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 global enable
command if the spanning tree protocol is disabled.
To configure an MST region:
Step Command Remarks
1. Enter system view. system-view N/A
2. Enter MST region view. stp region-configuration N/A
3. Configure the MST region
name.
region-name name
The default setting is the MAC
address.
4. Configure the
VLAN-to-instance mapping
table.
• instance instance-id vlan
vlan-id-list
• vlan-mapping modulo modulo
Use one of the commands.
By default, all VLANs in an MST
region are mapped to the CIST (or
MSTI 0).
5. Configure the MSTP revision
level of the MST region.
revision-level level The default setting is 0.
6. (Optional.) Display the MST
region configurations that are
not activated yet. check region-configuration N/A
7. Manually activate MST region
configuration.
active region-configuration N/A
8. (Optional.) Display the
activated configuration
information of the MST
region.
display stp region-configuration Available in any view.