DELL 9.7(0.0) Manuel D’Utilisation

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 

 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)