Administrator Guide

weight Specify a weight factor to a queue.
yellow Specify yellow (medium) drop precedence to a queue.
pool0 Service-pool buffer 1 (default service-pool for PFC traffic) .
pool1 Service-pool buffer 0 (default service-pool for lossy traffic).
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 CONFIGURATION mode
Command
History
Version Description
9.7(0.0) Introduced on the S6000-ON.
9.3.0.0 Introduced on the S6000 and Z9000 platforms
Usage
Information
You can configure only service pools 0 and 1 because the Dell Networking OS uses only these two service
pools. The pool, service0, is used for lossy queues and the pool, service1, is used for lossless (PFC)
queues in all the platforms.
You can configure the weight for the WRED average queue size for service1 on the S6000 Switch, which
is the only platform in which PFC is supported for this service pool. On the Z9000 Switch, only service0
can be configured because it does not support PFC.
A WRED profile contains a set of attributes, such as the minimum and maximum threshold values,
and the maximum drop rate for the received packets. You can add or remove WRED parameter
configurations for one or more shared service pools using a single command. The service-pool
wred command is similar in usage and working to the service-class bandwidth-percentage
queue-id command.
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-pool wred green pool0 thresh-1 pool1 thresh-2
Dell(conf) #service-pool wred yellow pool0 thresh-3 pool1 thresh-4
Dell(conf) #service-pool wred weight pool0 11 pool1 4
service-class wred
The mechanism to configure a weight factor for WRED and ECN functionality for backplane ports is supported on the Z9000
platform. Also, this mechanism to configure a weight for WRED and ECN functionality for front-end ports is supported on the
Z9000 platforms. Create a weighted random early detection (WRED) profile and ECN functionality per queue granularity for
backplane ports, and attach the WRED profile with a service class. You can enable or disable these parameters for each queue
and specify minimum and maximum buffer thresholds for each color-coding of the packets. Also, you can specify the maximum
drop rate percentage for yellow and green profiles. The per-queue profile configured is applicable to all the backplane ports.
Z9000
Syntax
[No] service-class wred {green | weight | yellow}{backplane} {[queue0
number/string] || [queue1 number/string] || [queue2 number/string] ||
Quality of Service (QoS) 1035