To access the Modify MST Instance dialog box:
Select Device > Configure > Spanning Tree > Multiple Spanning Tree (MST) > Instance Mapping.
Click Edit Buffer.
Select a MST instance and click Modify.
From this dialog box, you can modify the values for the following objects:
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.