Reference Guide

You can create a custom WRED profile or use one of the five pre-defined profiles.
Table 54. Pre-Defined WRED Profiles
Default Profile Name Minimum Threshold Maximum Threshold Maximum Drop Rate
wred_drop 0 0 100
wred_teng_y 594 5941 100
wred_teng_g 594 5941 50
wred_fortyg_y 594 5941 50
wred_fortyg_g 594 5941 25
Creating WRED Profiles
To create WRED profiles, use the following commands.
1. Create a WRED profile.
CONFIGURATION mode
wred
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 on which traffic the system applies the profile.
The system assigns a color-coded drop precedence — red, yellow, or green — to each packet based on the fourth bit of the 6-
bit DSCP field in the packet header before queuing it.
● If the fourth DSCP bit is 0, packet is marked as green.
● If the fourth DSCP bit is 1, the packet is marked as yellow (except for DSCP 63, which is marked as red).
● If you do not configure honor DSCP values on ingress packets (trust diffservcommand), all traffic defaults to green
drop precedence. See Honoring DSCP Values on Ingress Packets for more information.
● 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
Dell# show qos wred-profile
Wred-profile-name min-threshold max-threshold max-drop-rate
wred_drop 0 0 100
wred_teng_y 467 4671 100
wred_teng_g 467 4671 50
wred_fortyg_y 467 4671 50
wred_fortyg_g 467 4671 25
Quality of Service (QoS)
619