Installation manual

3-224

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Mapping CoS Values to Egress Queues

This switch processes Class of Service (CoS) priority tagged traffic by using four egress

queues for each port, with service schedules based on strict or Weighted Round Robin

(WRR). Up to eight separate traffic priorities are defined in IEEE 802.1p. The default

priority levels are assigned according to recommendations in the IEEE 802.1p standard

as shown in the following table.

The priority levels recommended in the IEEE 802.1p standard for various network

applications are shown in the following table. However, you can map the priority levels to

the switch’s output queues in any way that benefits application traffic for your own

network.

Command Attributes

• Priority – CoS value. (Range: 0-7, where 7 is the highest priority)

• Traffic Class

– Output queue buffer. (Range: 0-3, where 3 is the highest CoS priority

queue)

Table 3-18 Mapping CoS Values to Egress Queues

Queue

0123

Priority

1,2 0,3 4,5 6,7

Table 3-19 CoS Priority Levels

Priority Level Traffic Type

1 Background

2(Spare)

0 (default) Best Effort

3 Excellent Effort

4 Controlled Load

5 Video, less than 100 milliseconds latency and jitter

6 Voice, less than 10 milliseconds latency and jitter

7 Network Control

18. CLI shows Queue ID.