Administrator Guide

service-class wred backplane
After you create a WRED profile with ECN functionality, specify per-queue granularity for backplane ports and include the
WRED profile in a service class. Using this command, you can enable or disable queue-specific settings and specify minimum and
maximum buffer thresholds in the WRED profile applied to each packet color-code. Also, you can specify the maximum drop rate
percentage for yellow and green profiles. The per-queue profile configured is applied to all the backplane ports.
C9000 Series
Syntax
[no] service-class wred {green | weight | yellow} {[queue0 number/string]
|| [queue1 number/string] || [queue2 number/string] || [queue3 number/
string] || [queue4 number/string] || [queue5 number/string] || [queue6
number/string] || [queue7 number/string]} backplane
Parameters
service-class Define the mapping between the service class and policy-based QoS or routing.
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.
queue 0 to queue
7
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.
backplane Specify that the WRED weight and profile configured for each queue apply to
backplane ports.
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 Description
9.9(0.0) Introduced on the C9010.
9.2.1.0 Introduced on the Z9500 switch.
9.3.0.0 Introduced on the Z9000 platform.
Usage
Information
You can configure queues 0-7. 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 thresh-1
Dell(conf-wred)#threshold min 100 max 200 max-drop-rate 40
Dell(conf-wred)#wred thresh-2
Dell(conf-wred)#threshold min 300 max 400 max-drop-rate 80
Dell(conf)#service-class wred green queue5 thresh-1 queue7 thresh-2
backplane
Dell(conf)#service-class wred yellow queue1 thresh-2 queue3 thresh-1
backplane
Dell(conf)#service-class wred weight queue0 11 queue6 4 queue7 9
backplane
Quality of Service (QoS) 1411