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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.
Table 13-2 CoS Priority Levels
Priority Level Traffic Type
1 Background
2(Spare)
0 (default) Best Effort
3 Excellent Effort
4 Contro led Load
5 Video, less than 100 milliseconds latency and jitter
6 Voice, less than 10 milliseconds latency and jitter
7 Network Control
Command Attributes
• Priority – CoS value. (Range: 0-7, where 7 is the highest priority)
• Traffic Class
16
– Output queue buffer. (Range: 0-7, where 7 is the highest CoS
priority queue)
16. CLI shows Queue ID.
13-3
Mapping CoS Values to Egress Queues
This switch processes Class of Service (CoS) priority tagged traffic by using eight
priority 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.
Table 13-1 Mapping CoS Values to Egress Queues
0 1 2 3 4 5 6 7
2 0 1 3 4 5 6 7
Priority
Queue
Layer 2 Queue Settings
13