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Figure 104. Packet Drop Rate for WRED
You can create a custom WRED profile or use one of the five pre-defined profiles.
Table 62. 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
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 the system should apply the profile.
The 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 6bit field. Dell Networking uses the first 3 bits of this field (DP) to determine the drop precedence.
DP values of 110, 100, and 101 map to yellow; all other values map to green.
If you do not configure the system 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
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Quality of Service (QoS)