Administrator Guide

Applying a WRED Prole to Trac
After you create a WRED prole, you must specify to which trac the system should apply the prole.
The 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 eld. Dell Networking uses the rst 3 bits of this eld (DP) to determine the drop precedence.
• DP values of 110, 100, and 101 map to yellow; all other values map to green.
• If you do not congure the system 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
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
0
Dell#
Displaying WRED Drop Statistics
To display WRED drop statistics, use the following command.
• Display the number of packets the system the WRED prole drops.
EXEC Privilege mode
show qos statistics
Example of the show qos statistics wred-profile Command
Dell#show qos statistics wred-profile
Interface Te 0/20
Drop-statistic Dropped Pkts
Green 11234
Yellow 12484
Out of Profile 0
Dell#
Quality of Service (QoS)
659