Usage Scenario
MSTP divides a switching network into multiple regions, each of which has independent Multiple Spanning Trees. Each spanning tree is called an MSTI, and each region is called a Multiple Spanning Tree (MST) region. Two devices belong to the same MST region only when their following configurations are the same:
- MST region name
- Mappings between MSTIs and VLANs
- MST region revision level
To map a VLAN or VLAN range to an MSTI, run the instance command.
Configuration Impact
When using the undo instance command, note the following points:
- After the mapping between specified VLANs and a specified MSTI is deleted, these VLANs will be mapped to CIST, namely, instance 0.
- If no VLAN is specified, all VLANs that have established mappings with an MSTI are mapped to CIST.
If the instance command is run more than once, all configurations take effect.
Precautions
A VLAN cannot be mapped to different MSTIs. If the instance command is run more than once, the latest configuration overrides the previous one.