# Configuration

Device > Configure > Spanning Tree > Multiple Spanning Tree (MST)

This dialog box provides the global Multiple Spanning Tree configuration information for this device. The following data is displayed:

- Region Name (stpxMSTRegionName / stpxMSTRegionEditName)

- Region Revision Number (1..65535) (stpxMSTRegionRevision / stpxMSTRegionEditRevision)

- Maximum Instance Number (stpxMSTMaxInstanceNumber)

- Maximum Hop Count (1..40) (stpxMSTMaxHopCount)

Note: This dialog box is available only on devices where the spanning tree type is set to MST.

Do one of the following:

- Click Release Edit Buffer to discard any changes made by a CLI or SNMP user.

- Click OK to continue.

- Click Apply to save the changes in the dialog box.

> Note: After clicking Apply, a message appears stating that making changes might result in the loss of connectivity. To proceed, click Yes.

- Click Refresh to update the contents of the dialog box.

- Click Cancel to close the dialog box.

- Click Print to print the contents of the dialog box.

- Click Help to access online help.

Region Name (stpxMSTRegionName / stpxMSTRegionEditName)

Operational MST region name.

The second object (stpxMSTRegionEditName) is used to set this field.

Note: You may see a message which states that the edit buffer is locked by a non-SNMP (command line interface) user. In order to make changes, first click Yes to release the edit buffer and discard any changes that have been made.

Region Revision Number (1..65535) (stpxMSTRegionRevision / stpxMSTRegionEditRevision)

Operational MST region version.

The second object (stpxMSTRegionEditRevision) is used to set this field.

Note: You may see a message which states that the edit buffer is locked by a non-SNMP (command line interface) user. In order to make changes, first click Yes to release the edit buffer and discard any changes that have been made.

Maximum Instance Number (stpxMSTMaxInstanceNumber)

Maximum MST instances supported by this device.

Maximum Hop Count (1..40) (stpxMSTMaxHopCount)

Maximum number of hops for the MST region.