System information

2-63
Class of Service Configuration
2
CLI – This example assigns a default priority of 5 to port 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 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.
Console(config)#interface ethernet 1/3
Console(config-if)#switchport priority default 5 3-111
Console(config-if)#end
Console#show interfaces switchport ethernet 1/5 3-65
Information of Eth 1/5
Broadcast threshold: Enabled, 500 packets/second
Lacp status: Disabled
VLAN membership mode: Hybrid
Ingress rule: Disabled
Acceptable frame type: All frames
Native VLAN: 1
Priority for untagged traffic: 5
Gvrp status: Disabled
Allowed Vlan: 1(u),
Forbidden Vlan:
Console#
Table 2-3. Mapping CoS Values to Egress Queues
Queue
0123
Priority
1, 20, 34, 56, 7
Table 2-4. Priority Level Descriptions
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