Allied Telesis AT-S63 - Manual (Page 324)

Chapter 15: Class of Service
324 Section II: Advanced Operations
The default value of 1 for each queue gives all egress queues the
same weight. For two examples of the weighted round robin
scheduling method, refer to Table 12 on page 317 and Table 13 on
page 318.
6. To permanently save your change, return to the Main Menu and type S
to select Save Configuration Changes.