Users Guide

Figure 110. Packet Drop Rate for WRED
You can create a custom WRED profile or use one of the five pre-defined profiles.
Table 73. Pre-Defined WRED Profiles
Default Profile Name Minimum Threshold Maximum Threshold Maximum 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
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.
Quality of Service (QoS)
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