Dell S6000 Reference Manual page 1154

Command CONFIGURATION mode
Modes
Command
Version 9.3.0.0
History
Usage You can configure only service pools 0 and 1 because the Dell Networking OS uses
Information 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
Create a service class and assign ECN marking for different queues on backplane ports to the service
class. This functionality can be configured on the Z9000 platforms.
Syntax
[No] service-class wred ecn queues-list {backplane}
Parameters
wred
ecn
backplane
1154
Introduced on the S6000 and Z9000 platforms
Associate WRED with ECN to mark packets instead of
dropping them
Cause explicit congestion notification (ECN) to be used to
indicate network congestion, rather than dropping packets,
queues-list Enter the queue numbers, either as individual
queue numbers separated by commas or as an inclusive list
separating the starting and ending queue numbers with a
hyphen
Specify that the ECN marking configured for each queue
applies to backplane ports
Quality of Service (QoS)