Administrator Guide

wred Specify WRED curve parameters for a queue
green Specify green (low) drop precedence to a queue
weight Specify a weight factor to a queue
yellow Specify yellow (medium) drop precedence to a queue
backplane Specify that the WRED weight and profile configured for
each queue apply to backplane ports
queue 0 to
queue 3
Specify the queue number to which the WRED parameters
apply
number Enter a weight for the queue as a number in the range of 1 to
15. This parameter applies only if you specify the green or
yellow drop precedence.
string Enter the WRED profile name. It is a string of up to 32
characters. Or use one of the five pre-defined WRED profile
names. Pre-defined Profiles: wred_drop, wred-ge_y,
wred_ge_g, wred_teng_y, wred_teng_. This parameter
applies only if you specify a weight factor.
Default All queues on backplane ports operate in tail-drop (best-effort traffic) mode by
default. There is no default WRED green or yellow profile. The default weight is 0.
Command
Modes
QOS-POLICY-OUT mode
Command
History
Version 9.6.0.0 Added support for backplane changes in the Z9000
platform.
Version 9.3.0.0 Introduced on the Z9000 platform.
Usage
Information
You can configure all the data queues. For Z9000, you can configure queues 0-3.
WRED profile contains a set of characteristics, such as the minimum and maximum
WRED thresholds and the maximum drop rate. You can add and remove WRED
parameters for one or more queues by using the command in a single line. All of
the configured attributes apply to all the backplane ports and are for each queue.
To assign drop precedence to green or yellow traffic, use this command. If there is
no honoring enabled on the input, all the traffic defaults to green drop precedence.
Example
Dell(conf-wred) #wred-profile thresh-1
Dell(conf-wred) #threshold min 100 max 200 max-drop-rate 40
Dell(conf-wred) #wred-profile thresh-2
Dell(conf-wred) #threshold min 300 max 400 max-drop-rate 80
Dell(conf) #service-class wred green backplane queue5 thresh-1
queue7 thresh-2
Dell(conf) #service-class wred yellow backplane queue1
thresh-2 queue3 thresh-1
Dell(conf) #service-class wred weight backplane queue0 11
queue6 4 queue7 9
1272
Quality of Service (QoS)