Chapter 42 Configuring PFC QoS

Configuring PFC QoS

When you configure multiple-threshold standard queues, note the following information:

•The first percentage that you enter sets the lowest-priority threshold.

•The second percentage that you enter sets the next highest-priority threshold.

•The last percentage that you enter sets the highest-priority threshold.

•The percentages range from 1 to 100. A value of 10 indicates a threshold when the buffer is 10-percent full.

•Always set highest-numbered threshold to 100 percent.

When configuring the WRED-drop thresholds, note the following information:

•Each WRED-drop threshold has a low-WRED and a high-WRED value.

•Low-WRED and high-WRED values are a percentage of the queue capacity (the range is from 1 to 100).

•The low-WRED value is the traffic level under which no traffic is dropped. The low-WRED value must be lower than the high-WRED value.

•The high-WRED value is the traffic level above which all traffic is dropped.

•Traffic in the queue between the low- and high-WRED values has an increasing chance of being dropped as the queue fills.

Configuring a Tail-Drop Receive Queue

These port types have only tail-drop thresholds in their receive-queues:

•1q2t

•1p1q4t

•2q8t

•1q8t

To configure the drop thresholds, perform this task:

 

Command

Purpose

Step 1

 

 

Router(config)# interface {fastethernet

Selects the interface to configure.

 

gigabitethernet} slot/port

 

Step 2

 

 

Router(config-if)#rcv-queue threshold queue_id

Configures the receive-queue tail-drop threshold

 

thr1% thr2% thr3% thr4% {thr5% thr6% thr7% thr8%}

percentages.

 

Router(config-if)#no rcv-queue threshold

Reverts to the default receive-queue tail-drop threshold

 

[queue_id]

percentages.

Step 3

 

 

Router(config-if)# end

Exits configuration mode.

Step 4

 

 

Router# show queueing interface {fastethernet

Verifies the configuration.

 

gigabitethernet} slot/port

 

 

 

 

This example shows how to configure the receive-queue drop thresholds for Gigabit Ethernet port 1/1:

Router# configure terminal

Enter configuration commands, one per line. End with CNTL/Z.

Router(config)# interface gigabitethernet 1/1

Router(config-if)#rcv-queue threshold 1 60 75 85 100

Router(config-if)# end

Router#

 

 

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

 

 

 

 

 

 

OL-4266-08

 

 

42-93

 

 

 

 

 

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Cisco Systems OL-4266-08 manual Configuring a Tail-Drop Receive Queue, 42-93
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