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Cisco7600 Series Router Cisco IOS Software Configuration Guide, Release 12.2SX
OL-4266-08
Chapter42 Configuring PFC QoS
Configuring PFCQo S
Mapping CoS Values to Tail-Drop Thresholds on 1q4t/2q2t LAN Ports
Note Enter the show queueing interface {ethernet | fastethernet | gigabitethernet | tengigabitethernet}
slot/port | include type command to see the queue structure of a port.
On 1q4t/2q2t LAN ports, the receive- and transmit-queue tail-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
To map CoS values to tail-drop thresholds, perform this task:
When mapping CoS values to a tail-drop threshold, note the following information:
•Use the transmit queue and threshold numbers.
•Queue 1 is the low-priority standard transmit queue.
•Queue 2 is the high-priority standard transmit queue.
•There are two thresholds in each queue.
•Enter up to 8 CoS values to map to the threshold.
This example shows how to map the CoS values 0 and 1 to standard transmit queue 1/threshold 1 for Fast
Ethernet port 5/36:
Router# configure terminal
Enter configuration commands, one per line. End with CNTL/Z.
Router(config)# interface fastethernet 5/36
Router(config-if)# wrr-queue cos-map 1 1 0 1
Router(config-if)# end
Router#
This example shows how to verify the configuration:
Router# show queueing interface fastethernet 5/36 | begin queue thresh cos-map
queue thresh cos-map
---------------------------------------
1 1 0 1
1 2 2 3
2 1 4 5
2 2 6 7
<...Output Truncated...>
Router#
Command Purpose
Step1 Router(config)# interface type1 slot/port
1. type = ethernet, fastethernet, gigabitethernet, or tengigabitethernet
Selects the interface to configure.
Step2 Router(config-if)# wrr-queue cos-map
transmit_queue_# threshold_# cos1 [cos2 [cos3
[cos4 [cos5 [cos6 [cos7 [cos8]]]]]]]
Maps CoS values to a tail-drop threshold.
Step3 Router(config-if)# no wrr-queue cos-map Reverts to the default mapping.
Step4 Router(config-if)# end Exits configuration mode.
Step5 Router# show queueing interface type1 slot/port Verifies the configuration.