Creating Wred Profiles; Applying A Wred Profile To Traffic - Dell Z9000 Configuration Manual

10/25/40/50/100gbe throughput

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packets are dropped randomly at an exponential rate until the maximum threshold is reached (as shown

in the following illustration); this procedure is the "early detection" part of WRED. If the maximum

threshold, for example, 2000KB, is reached, all incoming packets are dropped until the buffer space

consumes less than 2000KB of the specified traffic.

Figure 94. Packet Drop Rate for WRED

You can create a custom WRED profile or use one of the five pre-defined profiles.

Creating WRED Profiles

To create WRED profiles, use the following commands.

Create a WRED profile.

CONFIGURATION mode

wred-profile

Specify the minimum and maximum threshold values.

After you create a WRED profile, you must specify to which traffic Dell Networking OS should apply the

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 field. Dell Networking uses the first three bits (LSB) of this field (DP) to determine the drop

DP values of 110 and 100, 101 map to yellow; all other values map to green.

Quality of Service (QoS)