Applying A Wred Profile To Traffic; Displaying Default And Configured Wred Profiles; Displaying Wred Drop Statistics - Dell S4820T Configuration Manual

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
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

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
Displaying WRED Profiles
Dell#show qos wred-profile
Wred-profile-name min-threshold max-threshold max-drop-rate
wred_drop
wred_teng_y
wred_teng_g
wred_fortyg_y
wred_fortyg_g

Displaying WRED Drop Statistics

To display WRED drop statistics, use the following command.
• Display the number of packets Dell Networking OS the WRED profile drops.
EXEC Privilege mode
show qos statistics wred-profile
Example of the show qos statistics wred-profile Command
Dell#show qos statistics wred-profile
Interface Te 1/1
Drop-statistic Dropped Pkts
Green
Yellow
774
0 0
467 4671
467 4671
467 4671
467 4671
51623
51300
100
100
50
50
25
Honoring DSCP
Quality of Service (QoS)