wredDisplaying Default and Configured WRED ProfilesTo display the default and configured WRED profiles, use the following command.• Display default and configured WRED profiles and their threshold values.EXEC modeshow qos wred-profileDisplaying WRED Drop StatisticsTo display WRED drop statistics, use the following command.• Display the number of packets Dell Networking OS the WRED profile drops.EXEC Privilege modeshow qos statistics wred-profilePre-Calculating Available QoS CAM SpaceBefore Dell Networking OS version 7.3.1, there was no way to measure the number of CAM entries apolicy-map would consume (the number of CAM entries that a rule uses is not predictable; from 1 to 16entries might be used per rule depending upon its complexity). Therefore, it was possible to apply to aninterface a policy-map that requires more entries than are available. In this case, the system writes asmany entries as possible, and then generates an CAM-full error message (shown in the followingexample). The partial policy-map configuration might cause unintentional system behavior.%EX2YD:12 %DIFFSERV-2-DSA_QOS_CAM_INSTALL_FAILED: Not enough space in L3Cam(PolicyQos) for class 2 (TeGi 12/20) entries on portpipe 1The test cam-usage command allows you to verify that there are enough available CAM entries beforeapplying a policy-map to an interface so that you avoid exceeding the QoS CAM space and partialconfigurations. This command measures the size of the specified policy-map and compares it to theavailable CAM space in a partition for a specified port-pipe.Test the policy-map size against the CAM space for a specific port-pipe or all port-pipes using thesecommands:• test cam-usage service-policy input policy-map {stack-unit } number port-setnumber• test cam-usage service-policy input policy-map {stack-unit } allThe output of this command, shown in the following example, displays:• The estimated number of CAM entries the policy-map will consume.• Whether or not the policy-map can be applied.• The number of interfaces in a port-pipe to which the policy-map can be applied.Specifically:• Available CAM — the available number of CAM entries in the specified CAM partition for the specifiedline card or stack-unit port-pipe.672 Quality of Service (QoS)
