Administrator Guide

service-pool wred
Configure a global buffer pool that serves as a shared buffer accessed by multiple queues when the minimum guaranteed
buffers for a queue are consumed.
The switch supports four global service-pools in the egress direction. Two service pools are used—one for lossy queues and
the other for lossless (priority-based flow control (PFC)) queues. You can enable 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 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
Quality of Service (QoS) 1405