52-68
Catalyst 6500 Series Switch Software Configuration Guide—Release 8.7
OL-8978-04
Chapter 52 Configuring QoS
Configuring QoS on the Switch
These sections describe how to map the CoS values to the drop thresholds:
• Associating the 1q4t/2q2t Ports, page 52-68
• Associating the 1q8t, 1q2t/1p2q2t, and 1p1q4t/1p2q2t Ports, page 52-68
• Associating the 1p1q0t/1p3q1t Ports, page 52-70
• Associating the 1p1q8t/1p2q1t, 1p3q8t, and 1p7q8t Ports, page 52-71
• Reverting to the CoS Map Default, page 52-72
Associating the 1q4t/2q2t Ports
On the 1q4t/2q2t ports, you configure the receive queues and the transmit queues with the same
command.
To associate the CoS values to the drop thresholds on the 1q4t/2q2t ports, perform this task in privileged
mode:
The receive- and transmit-drop thresholds have this relationship:
• Receive queue 1 (standard) threshold 1 = transmit queue 1 (standard low priority) threshold 1
• Receive queue 1 (standard) threshold 2 = transmit queue 1 (standard low priority) threshold 2
• Receive queue 1 (standard) threshold 3 = transmit queue 2 (standard high priority) threshold 1
• Receive queue 1 (standard) threshold 4 = transmit queue 2 (standard high priority) threshold 2
Use the transmit queue and transmit-queue drop-threshold values in this command. This example shows
how to associate the CoS values 0 and 1 to both the standard receive-queue 1/threshold 1 and the standard
transmit-queue 1/threshold 1:
Console> (enable) set qos map 2q2t tx 1 1 cos 0,1
Qos tx priority queue and threshold mapped to cos successfully.
Console> (enable)
Associating the 1q8t, 1q2t/1p2q2t, and 1p1q4t/1p2q2t Ports
On the 1q8t, 1q2t/1p2q2t and 1p1q4t/1p2q2t ports, you configure the receive queues and the transmit
queues separately.
1q8t Receive Queues
To associate the CoS values to the 1q8t receive-queue drop thresholds, perform this task in privileged
mode:
Task Command
Step 1
Associate the CoS value to a drop threshold. set qos map 2q2t tx q# thr# cos coslist
Step 2
Verify the configuration. show qos info config {1q4t rx | 2q2t tx}
Task Command
Step 1
Associate the CoS value to a receive-queue drop
threshold.
set qos map 1q8t rx 1 thr# cos coslist
Step 2
Verify the configuration. show qos info config 1q2t rx
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