Administrator Guide

2. Specify the minimum and maximum threshold values.
WRED mode
threshold
Applying a WRED Profile to Traffic
After you create a WRED profile, you must specify to which traffic Dell EMC Networking OS should apply the profile.
Dell EMC Networking OS assigns a color (also called drop precedence) — red, yellow, or green — to each packet based on it
DSCP value before queuing it.
DSCP is a 6–bit field. Dell EMC Networking uses the first three bits (LSB) of this field (DP) to determine the drop precedence.
● DP values of 110 and 100, 101 map to yellow; all other values map to green.
● If you do not configure Dell EMC Networking OS to honor DSCP values on ingress (refer to Honoring DSCP Values on
Ingress Packets), all traffic defaults to green drop precedence.
● Assign a WRED profile to either yellow or green traffic.
QOS-POLICY-OUT mode
wred
Displaying Default and Configured WRED Profiles
To display the default and configured WRED profiles, use the following command.
● Display default and configured WRED profiles and their threshold values.
EXEC mode
show qos wred-profile
Example of the show qos wred-profile Command.
DellEMC#show qos wred-profile
Wred-profile-name min-threshold max-threshold max-drop-rate
wred_drop 0 0 100
wred_gig_y 467 4671 100
wred_gig_g 467 4671 50
wred_teng_y 467 4671 50
wred_teng_g 467 4671 25
Displaying WRED Drop Statistics
To display WRED drop statistics, use the following command.
● Display the number of packets Dell EMC Networking OS the WRED profile drops.
EXEC Privilege mode
show qos statistics wred-profile
DellEMC#show qos statistics wred-profile
Interface Gi 1/1
Drop-statistic Dropped Pkts
Green 51623
Yellow 51300
Out of Profile 0
DellEMC#
668
Quality of Service (QoS)