Administrator Guide
Related
Commands
wred-profile — creates a WRED profile and name that profile.
trust — defines the dynamic classification to trust DSCP.
wred weight
Configure the weight factor used to determine the average-queue size for WRED and ECN operation. The weight value is used in an
output QoS policy applied to a front-end or backplane port.
C9000 Series
Syntax
[no] wred weight number
Parameters
weight Define the weight factor to be used for computation of the WRED average-queue size to
either enable WRED to discard packets or cause ECN to mark packets that exceed the
minimum threshold configured. This setting applies to front-end and backplane ports.
number
Enter the weight as a number to be used to calculate the average-queue size. The range
is 1 to 15. The default is 0.
Default The default weight is zero.
Command Modes QOS-POLICY-OUT 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 If the average queue size is more than the maximum threshold of WRED, the packet is dropped. If the average
queue size is between the minimum and maximum threshold values, the decision to drop or queue the packet is
taken based on the packet drop probability. The probability that a packet is dropped depends on the minimum
threshold, maximum threshold, and mark probability denominator.
Example
Dell(conf-qos-policy-out)# wred weight 5
wred ecn
To indicate network congestion without dropping packets, use explicit congestion notification (ECN).
C9000 Series
Syntax
wred ecn
To stop marking packets, use the no wred ecn command.
Defaults none
Command Modes QOS-POLICY-OUT mode
Command History
This guide is platform-specific. For command information about other platforms, refer to the relevant Dell
Networking OS Command Line Reference Guide.
The following is a list of the Dell Networking OS version history for this command.
Version Description
9.9(0.0) Introduced on the C9010.
9.2(1.0) Introduced on the Z9500.
1390 Quality of Service (QoS)