Dell PowerSwitch S4820T Configuration Guide for the S4820T System 9.14.1.0 - Page 243
CAM Optimization, Troubleshoot CAM Profiling, QoS CAM Region Limitation, Profiling
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• Re-configure the CAM threshold • Add or delete an ACL rule Example of Syslog message on CAM usage Following table shows few possible scenarios during which the syslog message appear on re-configuring the CAM usage threshold value. Consider if the last CAM threshold was set to 90 percent and now you re-configure the CAM threshold to 80. And, if the current CAM usage is 85 percent, then the system displays the syslog message saying that the CAM usage is above the configured CAM threshold value. Table 12. Possible Scenarios of Syslog Warning Old CAM Threshold New CAM Threshold Current CAM Usage 90 80 85 90 95 91 98 100 100 95 80 10 92 90 89 CAM Optimization Syslog DellEMC(conf)#Nov 5 19:55:12 %S6000:0 %ACL_AGENT-4ACL_AGENT_CAM_USAGE_OVER_THE_THRESHOLD: The Ipv4Acl cam region on stack-unit 0 Portpipe 0 Pipeline 0 is more than 80% Full. DellEMC(conf)#Nov 5 19:55:12 %S6000:0 %ACL_AGENT-4ACL_AGENT_CAM_USAGE_BELOW_THE_THRESHOLD: The cam-usage of Ipv4Acl cam region on stack-unit 0 Portpipe 0 Pipeline 0 is below 95%. No syslog No syslog No syslog When you enable the CAM optimization, if a Policy Map containing classification rules (ACL and/or DSCP/ ip-precedence rules) is applied to more than one physical interface on the same port-pipe, only a single copy of the policy is written (only one FP entry is used). When you disable this command, the system behaves as described in this chapter. Troubleshoot CAM Profiling The following section describes CAM profiling troubleshooting. QoS CAM Region Limitation To store QoS service policies, the default CAM profile allocates a partition within the IPv4Flow region. If the QoS CAM space is exceeded, a message similar to the following displays. %EX2YD:12 %DIFFSERV-2-DSA_QOS_CAM_INSTALL_FAILED: Not enough space in L3 Cam(PolicyQos) for class 2 (Te 1/20) entries on portpipe 1 for linecard 1 %EX2YD:12 %DIFFSERV-2DSA_QOS_CAM_INSTALL_FAILED: Not enough space in L3 Cam(PolicyQos) for class 5 (Te 1/ 22) entries on portpipe 1 for linecard 1 If you exceed the QoS CAM space, follow these steps. 1 Verify that you have configured a CAM profile that allocates 24 K entries to the IPv4 system flow region. 2 Allocate more entries in the IPv4Flow region to QoS. Content Addressable Memory (CAM) 243
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