Administrator Guide

threshold
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
Dell#show qos wred-profile
Wred-profile-name min-threshold max-threshold max-drop-rate
wred_drop 0 0 100
wred_teng_y 594 5941 100
wred_teng_g 594 5941 50
wred_fortyg_y 594 5941 50
wred_fortyg_g 594 5941 25
wred_oneg_y_pe 154 1538 100
wred_oneg_g_pe 154 1538 50
wred_teng_y_pe 154 1538 50
wred_teng_g_pe 154 1538 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
The following shows the show qos statistics output.
Dell# show qos statitstics wred-profile
WInterface Te 0/49
Drop-statistic Dropped Pkts
Green 51624
Yellow 51300
Out of Profile 0
The following shows the show qos statistics output on the port extender.
DELL#show qos statistics peGigE 0/1/1
Interface peGigE 0/1/1
Queue# Matched Pkts
0 0
1 0
2 0
Quality of Service (QoS)
757