Chapter 42 Configuring PFC QoS

Configuring PFC QoS

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:

 

Command

Purpose

Step 1

 

 

Router(config)# interface type1 slot/port

Selects the interface to configure.

Step 2

 

 

Router(config-if)# wrr-queuecos-map

Maps CoS values to a tail-drop threshold.

 

transmit_queue_# threshold_# cos1 [cos2 [cos3

 

 

[cos4 [cos5 [cos6 [cos7 [cos8]]]]]]]

 

Step 3

Router(config-if)#no wrr-queue cos-map

Reverts to the default mapping.

Step 4

 

 

Router(config-if)# end

Exits configuration mode.

Step 5

 

 

Router# show queueing interface type1 slot/port

Verifies the configuration.

 

 

 

1.type = ethernet, fastethernet, gigabitethernet, or tengigabitethernet

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#

 

 

Cisco 7600 Series Router Cisco IOS Software Configuration Guide, Release 12.2SX

 

 

 

 

 

 

 

 

 

 

 

 

OL-4266-08

 

 

42-107

 

 

 

 

 

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Cisco Systems OL-4266-08 manual Maps CoS values to a tail-drop threshold, 42-107
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