# Modify MST Instance

To access the Modify MST Instance dialog box:

1. Select Device > Configure > Spanning Tree > Multiple Spanning Tree (MST) > Instance Mapping.

2. Click Edit Buffer.

3. Select a MST instance and click Modify.

From this dialog box, you can modify the values for the following objects:

- Region Name (stpxMSTRegionName)

- Region Version (stpxMSTRegionRevision)

Do one of the following:

- Click OK to continue.

- Click Cancel to close the dialog box.

- Click Help to access online help.

Region Name (stpxMSTRegionName)

Operational MST region name.

Region Version (stpxMSTRegionRevision)

Operational MST region version.