Administrator Guide

Troubleshoot CAM Proling
The following section describes CAM proling troubleshooting.
CAM Prole Mismatches
The CAM prole on all cards must match the system prole. In most cases, the system corrects mismatches by copying the correct prole
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 conguration on the card to match the system conguration.
To prevent mismatches, Dell EMC Networking recommends the following:
• Use the eg-default CAM prole in a chassis that has only EG Series line cards. If this prole 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 prole on a card to match the new system prole.
• After installing a secondary RPM into a chassis, copy the running-conguration to the startup-conguration.
• Change to the default prole if downgrading to a Dell EMC Networking OS version earlier than 6.3.1.1.
• Use the CONFIGURATION mode commands so that the prole is change throughout the system.
• Use the EXEC Privilege mode commands to match the prole of a component to the prole of the target system.
QoS CAM Region Limitation
To store QoS service policies, the default CAM prole 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 congured a CAM prole that allocates 24 K entries to the IPv4 system ow 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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