Deployment Guide

Applying a WRED Profile to Traffic
After you create a WRED profile, you must specify to which traffic Dell EMC Networking OS should apply the profile.
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 field. Dell EMC 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 EMC Networking OS to honor DSCP values on ingress (refer to Honoring DSCP 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 Drop Statistics
To display WRED drop statistics, use the following command.
● Display the number of packets Dell EMC Networking OS the WRED profile drops.
EXEC Privilege mode
show qos statistics wred-profile
DellEMC#show qos statistics wred-profile
Interface Te 1/1/1
Drop-statistic Dropped Pkts
Green 51623
Yellow 51300
Out of Profile 0
DellEMC#
Displaying egress–queue Statistics
To display the number of transmitted and dropped packets and their rate on the egress queues of an interface, use the following
command:
● Display the number of packets and number of bytes on the egress-queue profile.
EXEC Privilege mode
show qos statistics egress-queue
DellEMC#show qos statistics egress-queue tengigabitethernet 1/1/1
Interface Te 1/1/1
Unicast/Multicast Egress Queue Statistics
Queue# Q# Type TxPkts TxPkts/s TxBytes TxBytes/s DroppedPkts DroppedPkts/s DroppedBytes
DroppedBytes/s
----------------------------------------------------------------------------------------------------------------------------
-
0 UCAST 0 0 0 0 0 0 0
0
1 UCAST 0 0 0 0 0 0 0
0
2 UCAST 0 0 0 0 0 0 0
0
720
Quality of Service (QoS)