Troubleshoot Cam Profiling; Cam Profile Mismatches; Qos Cam Region Limitation - Dell S4820T Configuration Manual

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, or if the system is running an Dell Networking OS version prior to version 6.3.1.1, the
system presents an error message. In this case, manually adjust the CAM configuration on the card to
match the system configuration.
Dell Networking recommends the following to prevent mismatches:
• 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 and 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 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 (Te 1/20) entries on portpipe 1 for linecard 1
%EX2YD:12 %DIFFSERV-2-
DSA_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.
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
254
Space.
Content Addressable Memory (CAM)