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
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
9.9(0.0) Introduced on the C9010.
9.2.1.0 Introduced on the Z9500 switch.
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 service0 pool is used for lossy queues; the service1 pool is used for lossless (PFC) queues on all platforms.
You can configure the weight for the WRED average queue size on service1 pool on which PFC is supported;
service0 pool 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 buffer-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 ecn backplane
Apply ECN marking on backplane port-queues in a service class.
C9000 Series
Syntax
[no] service-class wred ecn queue-list backplane
Parameters
service-class Define the mapping between the service class and policy-based QoS or routing.
wred Associate WRED with ECN to mark packets instead of dropping them.
Quality of Service (QoS) 1355