Dell PowerSwitch S4820T Configuration Guide for the S4820T System 9.112.0P1 - Page 229
View CAM Usage, CAM Optimization, Troubleshoot CAM Profiling, QoS CAM Region Limitation, Profiling
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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 Dell#show cam-usage Stackunit|Portpipe| CAM Partition | Total CAM | Used CAM |Available CAM 0 0 | IN-L3 ACL | 512 | 1 | 511 | | IN-V6 ACL | 0 | 0 | 0 | | IN-L2 ACL | 768 | 0 | 768 | | OUT-L3 ACL | 158 | 5 | 153 | | IN-L3 ECMP GRP| 1024 | 0 | 1024 | | OUT-V6 ACL | 158 | 0 | 158 | | OUT-L2 ACL | 206 | 7 | 199 7 | 0 | IN-L3 ACL | 512 | 1 | 511 | | IN-V6 ACL | 0 | 0 | 0 | | IN-L2 ACL | 768 | 0 | 768 | | OUT-L3 ACL | 158 | 5 | 153 | | OUT-V6 ACL | 158 | 0 | 158 | | OUT-L2 ACL | 206 | 7 | 199 Codes: * - cam usage is above 90%. Dell# CAM Optimization 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. Troubleshoot CAM Profiling The following section describes CAM profiling troubleshooting. 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-2DSA_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 Space. Content Addressable Memory (CAM) 229
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