Users Guide

Figure 106. Packet Drop Rate for WRED
You can create a custom WRED prole or use one of the ve pre-dened proles.
Creating WRED Proles
To create WRED proles, use the following commands.
1 Create a WRED prole.
CONFIGURATION mode
wred-profile
2 Specify the minimum and maximum threshold values.
WRED mode
threshold
Applying a WRED Prole to Trac
After you create a WRED prole, you must specify to which trac Dell Networking OS should apply the prole.
Dell 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 eld. Dell Networking uses the rst three bits (LSB) of this eld (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 congure Dell Networking OS to honor DSCP values on ingress (refer to Honoring DSCP Values on Ingress Packets), all
trac defaults to green drop precedence.
• Assign a WRED prole to either yellow or green trac.
QOS-POLICY-OUT mode
wred
Quality of Service (QoS)
701