Allied Telesis AT-S63 - Manual (Page 462)

Chapter 26: Spanning Tree Protocol Commands
462 Section V: Spanning Tree Protocols
ACTIVATE STP
Syntax
activate stp
Parameters
None.
Description
Use this command to designate STP as the active spanning tree on the
switch. You cannot enable STP or configure its parameters until you have
designated it as the active spanning tree with this command.
Only one spanning tree protocol, STP, RSTP, or MSTP, can be active on
the switch at a time.
Example
The following command designates STP as the active spanning tree:
activate stp