Allied Telesis AT-S63 - Manual (Page 144)

Chapter 12: Quality of Service
144 Section II: Advanced Features
Note
The tagged information in a packet is not changed as the packet
traverses the switch. A tagged packet exits the switch with the same
priority level that it had when it entered.
The default for this parameter is No, meaning that the priority level
of tagged packets is determined by the priority level specified in
the packet itself.
7. Click Apply.
Configuration changes are immediately activated on the switch.
8. To permanently save the change, return to the General tab on the
System page and click Save Changes.
For more information about what the Save Changes button does,
refer to ”Saving Your Parameter Changes” on page 36.