Allied Telesis AT-S39 - Manual (Page 286)

Section III: Web Browser Management
286
4. To select an active spanning tree protocol, do the following:
a. Click STP or RSTP in the Active Protocol Version section of the
menu. The default is RSTP. Only one spanning tree protocol can
be active on the switch at a time.
The switch resets and changes the active spanning tree
protocol.
b. To continue managing the switch, you must reestablish your
management session. To configure STP settings, go to
Configuring STP on page 287. To configure RSTP settings, go to
Configuring RSTP on page 291.
5. To enable or disable the spanning tree protocol, do the following:
a. Click the Enable Spanning Tree check box. A check indicates that
the feature is enabled while no check indicates that the feature is
disabled. The default is disabled.
b. Click Apply.