Pre-Calculating Available Qos Cam Space - Dell C9000 Series Networking Configuration Manual

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Dell(conf-wred)#wred thresh-2

Dell(conf-wred)#threshold min 300 max 400 max-drop-rate 80

Associate a service class for each WRED profile, and assign the WRED profile to specific queues on

backplane ports.

CONFIGURATION mode

Dell(conf)#service-class wred green queue5 thresh-1 queue7 thresh-2 backplane

Dell(conf)#service-class wred yellow queue1 thresh-2 queue3 thresh-1 backplane

Dell(conf)#service-class wred weight queue0 11 queue6 4 queue7 9 backplane

Create a global buffer pool that serves as a shared buffer accessed by multiple queues when the

minimum guaranteed buffers for a queue are consumed. The switch supports four global service-pools

in the egress direction.

Dell(conf)#service-pool wred green pool0 thresh-1 pool1 thresh-2

Dell(conf)#service-pool wred yellow pool0 thresh-3 pool1 thresh-4

Dell(conf)#service-pool wred weight pool0 11 pool1 4

Enable ECN marking on specific queues on backplane ports with a service class.

CONFIGURATION mode

Dell(conf)#service-class wred ecn 0, 3-5, 7 backplane

Pre-Calculating Available QoS CAM

Pre-calculating available QoS CAM space allows you to measure the number of CAM entries a policy-map

This feature allows you to avoid applying a policy-map on an interface that requires more CAM entries than

are available and receive a 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 (Te 12/20) entries on portpipe 1 for linecard 12

%EX2YD:12 %DIFFSERV-2-

DSA_QOS_CAM_INSTALL_FAILED: Not enough space in L3 Cam(PolicyQos) for class 5

22) entries on portpipe 1 for linecard 12

Use the test cam-usage command 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.

Test the policy-map size against the CAM space for a specific port-pipe or all port-pipes using these

Quality of Service (QoS)

Troubleshooting