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Troubleshoot CAM Profiling
The following section describes CAM profiling troubleshooting.
CAM Profile Mismatches
The CAM profile on all cards must match the system profile. In most cases, the system corrects mismatches by copying the
correct profile to the card, and rebooting the card. If three resets do not bring up the card, the system displays an error
message. In this case, manually adjust the CAM configuration on the card to match the system configuration.
To prevent mismatches, Dell EMC 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 a chassis 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 system profile.
● 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 EMC 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 the target system.
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 (Gi 1/20) entries on portpipe 1 for stackunit 1
%EX2YD:12 %DIFFSERV-2-
DSA_QOS_CAM_INSTALL_FAILED: Not enough space in L3 Cam(PolicyQos) for class 5
(Gi 1/22) entries on portpipe 1 for stackunit 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.
Dell EMC 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)
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