Mapping Cos Values To Egress Queues; Table 3-12 Mapping Cos Values To Egress Queues; Table 3-13 Cos Priority Levels - SMC Networks SMC8748ML3 Management Manual

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 3-12 Mapping CoS Values to Egress Queues

Queue
Priority
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.
Priority Level
1
2
0 (default)
3
4
5
6
7
Command Attributes
• Priority – CoS value. (Range: 0-7, where 7 is the highest priority)
• Traffic Class
highest CoS priority queue)
19. CLI shows Queue ID.
0 1 2
2 0 1

Table 3-13 CoS Priority Levels

Traffic Type
Background
(Spare)
Best Effort
Excellent Effort
Controlled Load
Video, less than 100 milliseconds latency and jitter
Voice, less than 10 milliseconds latency and jitter
Network Control
19
– Output queue buffer. (Range: 0-7, where 7 is the
C S
LASS OF ERVICE
3 4 5
3 4 5
C
ONFIGURATION
6 7
6 7
3-205