Allied Telesis AT-S63 - Manual (Page 527)

AT-S63 Management Software Command Line User’s Guide
Section V: Spanning Tree Protocols 527
Example
The following commands assign port 2 a port cost of 15 and a port priority
of 192 (increment 12):
awplus> enable
awplus# configure terminal
awplus(config)# interface 2
awplus(config-if)# spanning-tree path-cost 15
awplus(config-if)# spanning-tree priority 12