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.
MST Instance (mstInstanceEditIndex)
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 (mstInstanceEditVlansMapped)
Indicates the VLANs mapped to the selected MST instance.
Note: Valid VLAN values range from 1 to 4094.