SMC Networks 8126PL2-F, Management Manual

Page: 239 / 614

Class of Service Configuration
3-191
3
Mapping CoS Values to Egress Queues
This switch processes Class of Service (CoS) priority tagged traffic by using four
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
15
– Output queue buffer. (Range: 0-3, where 3 is the highest CoS
priority queue)
Note:
Mapping specific values for CoS priorities is implemented as an interface
command, but any changes will apply to the all interfaces on the switch.
Table 3-15 Mapping CoS Values to Egress Queues
Queue
0 1 2 3
Priority
1,2 0,3 4,5 6,7
Table 3-16 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
15. CLI shows Queue ID.