View Cam Usage; Cam Optimization; Troubleshoot Cam Profiling; Qos Cam Region Limitation - Dell S3048-ON Configuration Manual

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View CAM Usage

View the amount of CAM space available, used, and remaining in each partition (including IPv4Flow and Layer 2 ACL sub- partitions) using

the show cam-usage command in EXEC Privilege mode

The following output shows CAM blocks usage for Layer 2 and Layer 3 ACLs and other processes that use CAM space:

Example of the show cam-usage Command

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.

The following section describes CAM profiling troubleshooting.

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.

Verify that you have configured a CAM profile that allocates 24 K entries to the IPv4 system flow region.

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

Content Addressable Memory (CAM)

Pre-Calculating Available QoS CAM

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