Concept Guide

Applying a WRED Prole to Trac
After you create a WRED prole, you must specify to which trac Dell EMC Networking OS should apply the prole.
Dell EMC 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 eld. Dell EMC Networking uses the rst three bits (LSB) of this eld (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 congure Dell EMC Networking OS to honor DSCP values on ingress (refer to Honoring DSCP Values on Ingress
Packets), all trac defaults to green drop precedence.
• Assign a WRED prole to either yellow or green trac.
QOS-POLICY-OUT mode
wred
Displaying Default and Congured WRED Proles
To display the default and congured WRED proles, use the following command.
• Display default and congured WRED proles and their threshold values.
EXEC mode
show qos wred-profile
Displaying WRED Proles
Example of the show qos wred-prole Command.
DellEMC#show qos wred-profile
Wred-profile-name min-threshold max-threshold max-drop-rate
wred_drop 0 0 100
wred_gig_y 467 4671 100
wred_gig_g 467 4671 50
wred_teng_y 467 4671 50
wred_teng_g 467 4671 25
Displaying WRED Drop Statistics
To display WRED drop statistics, use the following command.
• Display the number of packets Dell EMC Networking OS the WRED prole drops.
EXEC Privilege mode
show qos statistics wred-profile
Example of the show qos statistics wred-profile Command
DellEMC#show qos statistics wred-profile
Interface Gi 1/1
Drop-statistic Dropped Pkts
Green 51623
Yellow 51300
Out of Profile 0
Quality of Service (QoS)
729