Configuring an MST region
Spanning tree devices belong to the same MST region if they are both connected through a physical link and configured with the following details:
Format selector (0 by default, not configurable).
MST region name.
MST region revision level.
VLAN-to-instance mapping entries in the MST region.
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 doing one of the following:
Use the active region-configuration command.
Enable a spanning tree protocol by using the stp global enable command if the spanning tree protocol is disabled.
In STP or RSTP mode, MST region configurations do not take effect.
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. |
| 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 |