Reference Guide

680 | Quality of Service (QoS)
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FTOS 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 map to yellow, and all other values
map to green. If you do not configure FTOS to honor DSCP values on ingress (Honor DSCP values on
ingress packets) see all traffic defaults to green drop precedence.
Assign a WRED profile to either yellow or green traffic from QOS-POLICY-OUT mode using the
wred
command.
Display Default and Configured WRED Profiles
Display default and configured WRED profiles and their threshold values using the show qos wred-profile
command from EXEC mode, as shown in Figure 37-9.
Figure 37-9. Displaying WRED Profiles (S4810)
Display WRED Drop Statistics
Display the number of packets FTOS dropped by WRED Profile using the show qos statistics command
from EXEC Privilege mode.
Figure 37-10. show qos statistics Command Example (S4810)
FTOS#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
wred_fortyg_y 467 4671 50
wred_fortyg_g 467 4671 25
0
FTOS#
FTOS#show qos statistics wred-profile
Interface Te 0/49
Drop-statistic Dropped Pkts
Green 51624
Yellow 51300
Out of Profile 0
FTOS#