The revision-level command configures the revision level of MST region of a switching device.
The undo revision-level command restores the default level.
By default, the revision level of MST region is 0.
| Parameter | Description | Value |
|---|---|---|
| level | Specifies the revision level of the MST region. | The value is an integer ranging from 0 to 65535. |
Usage Scenario
MSTP divides a switching network into multiple regions, each of which has multiple spanning trees that are independent of each other. Each region is called an MST region and each spanning tree is called a multiple spanning tree instance (MSTI).
To perform tree calculation in an MST region, multiple devices in this region must have the same value for the three parameters. If the parameters are changed after MSTP is deployed, the change will cause spanning tree recalculation and route flapping on the network. As a result, you are advised not to change the MST region parameters after MSTP is deployed.
If two switching devices have the same region name and VLAN mapping table, the revision-level command can be used to set different revision levels for the two devices so that the two devices belong to different MST regions.
MSTP is a standard protocol; therefore, the MSTP revision level of a device is 0 by default. If the revision level of some devices from a specified manufacturer is not 0, you must change the MSTP revision level of devices to be the same to facilitate tree calculation in an MST region.
VBST does not support regions. Therefore, this command does not take effect when the spanning tree protocol is VBST.
Follow-up Procedure
After configuring MST region parameters, run the active region-configuration command to activate the MST region configurations.
Precautions
If an MST region revision level is changed several times, only the latest configuration activated using the active region-configuration command takes effect.