Allied Telesis AT-S63 - Manual (Page 292)

Chapter 19: Multiple Spanning Tree Protocol
292 Section IV: Spanning Tree Protocols
Enabling MSTP
The AT-9400 Switch can support the three spanning tree protocols STP,
RSTP, and MSTP. However, only one spanning tree protocol can be
active on the switch at a time. So before you can enable a spanning tree
protocol, you must first select it as the active spanning tree protocol. After
you select it, you can then enable or disable it.
To select MSTP as the active spanning tree protocol and to enable or
disable it, perform the following procedure:
Note
Changing the active spanning tree protocol resets the switch.
1. From the Home page, select Configuration.
2. From the Configuration menu, select the Layer 2 option.
3. Select the Spanning Tree tab.
The Spanning Tree tab is shown in Figure 120.
Figure 120. Spanning Tree Tab (Configuration)
Note
If you do not want to change the active spanning tree protocol and
just want to enable or disable it, go to Step 5.