Allied Telesis AlliedWare Plus Operating System Version 5.4.4C (x310-26FT,x310-26FP,x310-50FT,x310-50FP) - Manual (Page 994)

Quality of Service (QoS) Introduction
Software Reference for x310 Series Switches
38.22 AlliedWare Plus TM Operating System - Version 5.4.4C C613-50046-01 REV A
1. If the packet enters an egress port carrying no QoS markers and no QoS queueing
commands have been set on the switch, then the packet will exit the port via queue
number 2.
2. If the packet contains a CoS value and arrives at an egress port with no other
configuration applying, then its queue mapping will be subject to the setting of the
mls qos map cos-queue to command.
3. Situations (1) and (2) can be overridden by the remark new-cos command. This
command sets a default queue for each switch port.