C
LASS
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ERVICE
C
ONFIGURATION
3-169

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

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.

Console(config)#interface ethernet 1/3 4-145
Console(config-if)#switchport priority default 5 4-224
Console(config-if)#end
Console#show interfaces switchport ethernet 1/3 4-156
Information of Eth 1/3
Broadcast threshold: Disabled
LACP status: Disabled
Ingress rate limit: disable, Level: 30
Egress rate limit: disable, Level: 30
VLAN membership mode: Hybrid
Ingress rule: Enabled
Acceptable frame type: Tagged frames only
Native VLAN: 1
Priority for untagged traffic: 5
GVRP status: Disabled
Allowed VLAN: 1(u),
Forbidden VLAN:
Private-VLAN mode: NONE
Private-VLAN host-association: NONE
Private-VLAN mapping: NONE
Console#
Table 3-10 Egress Queue Priority Mapping
Queue 0123
Priority 1,2 0,3 4,5 6,7
Q0
Serviced
byweighted
roundrobin
Q1
Q2
Q3
1,2
0,3
4,5
6,7