Users Guide

Figure 105. 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 Networking OS should apply the profile.
Dell 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 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 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
Quality of Service (QoS) 675