CAM OptimizationWhen 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 singlecopy of the policy is written (only one FP entry is used). When you disable this command, the systembehaves as described in this chapter.Troubleshoot CAM ProfilingThe following section describes CAM profiling troubleshooting.CAM Profile MismatchesThe CAM profile on all cards must match the system profile. In most cases, the system correctsmismatches by copying the correct profile to the card, and rebooting the card. If three resets do notbring up the card, or if the system is running an Dell Networking OS version prior to version 6.3.1.1, thesystem displays an error message. In this case, manually adjust the CAM configuration on the card tomatch the system configuration.To prevent mismatches, Dell Networking recommends the following:• Use the eg-default CAM profile in a chassis that has only EG Series line cards. If this profile is used in achassis with non-EG line cards, the non-EG line cards enter a problem state.• Before moving a card to a new chassis, change the CAM profile on a card to match the new systemprofile.• After installing a secondary RPM into a chassis, copy the running-configuration to the startup-configuration.• Change to the default profile if downgrading to a Dell Networking OS version earlier than 6.3.1.1.• Use the CONFIGURATION mode commands so that the profile is change throughout the system.• Use the EXEC Privilege mode commands to match the profile of a component to the profile of thetarget system.QoS CAM Region LimitationTo 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 L3Cam(PolicyQos) for class 2 (Te 1/20/1) entries on portpipe 1 for linecard 1%EX2YD:12 %DIFFSERV-2-DSA_QOS_CAM_INSTALL_FAILED: Not enough space in L3 Cam(PolicyQos) forclass 5 (Te 1/22) entries on portpipe 1 for linecard 1If 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 flowregion.2. Allocate more entries in the IPv4Flow region to QoS.Dell Networking OS supports the ability to view the actual CAM usage before applying a service-policy.The test cam-usage service-policy command provides this test framework. For more information,refer to Pre-Calculating Available QoS CAM Space.Content Addressable Memory (CAM) 227
