Dell Networking S6000 Instrukcja Użytkownika Pobierz pdf (Strona 716)

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Applying a WRED Profile to Traffic

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

profile.

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

precedence.

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

• If you do not configure Dell Networking OS to honor DSCP values on ingress (refer to Honoring DSCP

Values on Ingress Packets), all traffic defaults to green drop precedence.

• Assign a WRED profile to either yellow or green traffic.

QOS-POLICY-OUT mode

wred

Displaying Default and Configured WRED Profiles

To display the default and configured WRED profiles, use the following command.

• Display default and configured WRED profiles and their threshold values.

EXEC mode

show qos wred-profile

Displaying WRED Drop Statistics

To display WRED drop statistics, use the following command.

• Display the number of packets Dell Networking OS the WRED profile drops.

EXEC Privilege mode

show qos statistics wred-profile

Pre-Calculating Available QoS CAM Space

Pre-calculating available QoS CAM space is supported on the S6000 platform.

Before Dell Networking OS version 7.3.1, there was no way to measure the number of CAM entries a

policy-map would consume (the number of CAM entries that a rule uses is not predictable; from 1 to 16

entries might be used per rule depending upon its complexity). Therefore, it was possible to apply to an

interface a policy-map that requires more entries than are available. In this case, the system writes as

many entries as possible, and then generates an CAM-full error message (shown in the following

example). The partial policy-map configuration might cause unintentional system behavior.

%EX2YD:12 %DIFFSERV-2-DSA_QOS_CAM_INSTALL_FAILED: Not enough space in L3

Cam(PolicyQos) for class 2 (TeGi 12/20) entries on portpipe 1

The test cam-usage command allows you to verify that there are enough available CAM entries before

applying a policy-map to an interface so that you avoid exceeding the QoS CAM space and partial

configurations. This command measures the size of the specified policy-map and compares it to the

available CAM space in a partition for a specified port-pipe.

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Quality of Service (QoS)

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