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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
Example of the show qos wred-profile Command
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
Displaying WRED Drop Statistics
To display WRED drop statistics, use the following command.
• Display the number of packets that the WRED profile drops.
EXEC Privilege mode
show qos statistics
Example of the show qos statistics Command
Dell# show qos statitstics wred-profile
WInterface Te 0/49
Drop-statistic Dropped Pkts
Green 51624
Yellow 51300
Out of Profile 0
740
Quality of Service (QoS)