432 | Quality of Service (QoS)
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Create WRED Profiles
To create a WRED profile, follow these steps:
1. To create a WRED profile, use the
wred command from CONFIGURATION mode.
2. The
wred command places you in WRED mode. From this mode, specify minimum and maximum
threshold values using the
threshold command.
Apply a WRED Profile to Traffic
After 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 the
DSCP value before queuing it. DSCP is a 6-bit field. If the fourth bit from MSB in DSCP is 0, then it is
assigned as green packet. If it is 1, then it is assigned as Yellow packet (expect DSCP of 111111, which is a
Red packet and is always dropped). If you do not configure FTOS to honor DSCP values on ingress, all
traffic defaults to green (refer to Honor DSCP Values on Ingress Packets).
To assign a WRED profile to either yellow or green traffic, use the
wred command from
QOS-POLICY-OUT mode.
Display Default and Configured WRED Profiles
To display default and configured WRED profiles and their threshold values, use the show qos wred-profile
command from EXEC mode (Figure 24-12).
Figure 24-12. Displaying WRED Profiles
Table 24-5. Pre-defined WRED Profiles
Default Profile Name Minimum Threshold Maximum Threshold Maximum 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
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
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