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C
ONFIGURING
THE
S
WITCH
3-208
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.
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
21
– Output queue buffer. (Range: 0-7, where 7 is the
highest CoS priority queue)
Table 3-12 Mapping CoS Values to Egress Queues
Queue
01234567
Priority
20134567
Table 3-13 CoS Priority Levels
Priority Level Traffic Type
1Background
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
21. CLI shows Queue ID.