Finish start – PLANET XGS3-24042 User Manual

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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

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.

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