Reference Guide

WRED and ECN operation on the global service-pools. You can define WRED profiles and weight on each
of the global service-pools for both lossy and lossless (PFC) service-pools.
C9000 Series
Syntax
[no] buffer-pool wred {green | weight | yellow} {[pool0 number/
string] || [pool1 number/string]}
Parameters
buffer-pool 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
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
Quality of Service (QoS)
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