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.
Z9500
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
9.2.1.0
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).
Z9500
Syntax
wred ecn
Quality of Service (QoS)
1525
