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Figure 113. Packet Drop Rate for WRED
You can create a custom WRED profile or use one of the five pre-defined profiles.
Creating WRED Profiles
To create WRED profiles, use the following commands.
1. Create a WRED profile.
CONFIGURATION mode
wred-profile
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 6bit 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
700
Quality of Service (QoS)