Reference Guide

Quality of Service (QoS) | 741
Create WRED Profiles
To create a WRED profile:
1. Create a WRED profile using the command
wred from CONFIGURATION mode.
2. The command
wred places you in WRED mode. From this mode, specify minimum and maximum
threshold values using the command
threshold.
Applying a WRED profile to traffic
Once you create a WRED profile you must specify to which traffic FTOS should apply the profile.
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 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 (Honoring DSCP values on
ingress packets on page 736) 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
command
wred.
Displaying Default and Configured WRED Profiles
Display default and configured WRED profiles and their threshold values using the command show qos
wred-profile
from EXEC mode, as shown in Figure 39-11.
Figure 39-11. Displaying S5000 WRED Profiles
wred_fortyg_y 467 4671 50
wred_fortyg_g 467 4671 25
Table 39-6. Pre-defined WRED Profiles for the S5000
Default Profile
Name
Minimum
Threshold
Maximum
Threshold
Maximum
Drop Rate
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#