Administrator Guide
• If you do not congure the system to honor DSCP values on ingress (refer to Honoring DSCP Values on Ingress Packets), all
trac defaults to green drop precedence.
• Assign a WRED prole to either yellow or green trac.
QOS-POLICY-OUT mode
wred
Displaying Default and Congured WRED Proles
To display the default and congured WRED proles, use the following command.
• Display default and congured WRED proles and their threshold values.
EXEC mode
show qos wred-profile
Displaying WRED Proles
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 prole 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#
Classifying Layer 2 Trac on Layer 3 Interfaces
To process Layer 3 packets that contain Dot1p — (IEEE 802.1p) Packet classication (Layer 2 headers), congure VLAN tags on a
physical Layer 3 interface (that is congured with an IP address and is not associated with any VLAN). You can also congure a
VLAN subinterface over a physical underlying interface and classify packets using the dot1p value.
To apply an input policy map to Layer 3 physical interfaces, use the service-policy input policy-name layer 2
command in Interface Conguration mode.
648
Quality of Service (QoS)