QTECH QSW-8300 Инструкция по настройке - Manual (Page 99)

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scheduling operation assigns the packets to different priority queues according to the internal
priority, and then forward the packets according to the priority queue weight and the drop
precedence. The following flowchart describes the scheduling operation.
Finish
Start
Remark DSCP and L2 COS fields
of the packets according to
Int-Prio-to-DSCP
Int-Prio-to-COS mapping(*1)
Place the packets into the
specified queue, and forward the
packets according to the weight
priority
Yes
No
Read the buffer value according
to the queue management
algorithm (WDRR/SP), the drop
precedence and the egress
queue
buffer is
available
Drop the
packets
Select the queue according to
IntPrio-to-Queue mapping
Obtain the packet Drop-Prec
according to IntPrio-to-Drop-
Prec
Queuing and Scheduling process
Note 1: The ingress configures pass-through-cos, pass-through-dscp to forbid the rewrite of L2
CoS priority and dscp value. At the egress, obtain L2 CoS priority and dscp value according to
the final Int-Prio of the packets, decide whether rewrite L2 CoS priority and dscp value
according to pass-through-cos, pass-through-dscp.
12.2 QoS Configuration Task List
Configure class map
Set up a classification rule according to ACL, CoS, VLAN ID, IPv4 Precedent, DSCP, IPV6 FL