Allied Telesis AT-S63 - Manual (Page 334)

Chapter 20: Quality of Service (QoS) Commands
334 Section II: Advanced Operations
PURGE QOS
Syntax
purge qos
Parameters
None
Description
This command destroys all policies, traffic classes, and flow groups;
resets the CoS priorities to port egress queues to the default values; and
sets the scheduling mode and egress weight queues to their default
values.
Example
The following command resets QoS to the default values:
purge qos