# Instance Mapping

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

This dialog box provides a table which lists the VLANs mapped to a particular MST instance.

The following data is displayed:

- MST Instance (stpxMSTInstanceIndex)

- VLANs Mapped (stpxMSTInstanceVlansMapped)

- Remaining Hop Count (stpxMSTInstanceRemainingHopCount)

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

Do one of the following:

- Click Edit Buffer to modify the VLANs mapped to a particular MST Instance.

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 the non-SNMP user made.

- 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.

MST Instance (stpxMSTInstanceIndex)

Unique identifier for an MST instance that is supported by the device. Values can range from 0 to the value of MST Max Instance Number.

VLANs Mapped (stpxMSTInstanceVlansMapped)

VLANs mapped to this MST instance.

Remaining Hop Count (stpxMSTInstanceRemainingHopCount)

Remaining hop count for this MST instance.