PLANET XGS3-24042 - Manual (Page 169)

18-6
Note 1: Int-Prio will be covered with the after setting, Set Int-Prio of the specific color action will cover Set
Int-Prio of the unrelated action with the color.
Note 2: Drop the internal priority of the packets according to IntP-to-IntP map. Source Int-Prio means to the
obtainable Int-Prio in Classification flow or Int-Prio set by the unrelated action with the color.
Queuing and scheduling: There are the internal priority for the egress packets, the 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
Figure 18-6 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.