Concept Guide

NOTE:
If you delete a FP in a CAM region that is assigned with threshold, a syslog warning appears even during the silence period.
The system triggers syslog during the following events:
• Re-congure the CAM threshold
• Add or delete an ACL rule
Example of Syslog message on CAM usage
Following table shows few possible scenarios during which the syslog message appear on re-conguring the CAM usage threshold value.
Consider if the last CAM threshold was set to 90 percent and now you re-congure the CAM threshold to 80. And, if the current CAM
usage is 85 percent, then the system displays the syslog message saying that the CAM usage is above the congured CAM threshold
value.
Table 14. Possible Scenarios of Syslog Warning
Old CAM Threshold New CAM Threshold Current CAM
Usage
Syslog
90 80 85
DellEMC(conf)#Nov 5
19:55:12 %S6000:0 %ACL_AGENT-4-
ACL_AGENT_CAM_USAGE_OVER_THE_THRESHOLD: The
Ipv4Acl cam region on stack-unit 0 Portpipe 0
Pipeline 0 is more than 80% Full.
90 95 91
DellEMC(conf)#Nov 5
19:55:12 %S6000:0 %ACL_AGENT-4-
ACL_AGENT_CAM_USAGE_BELOW_THE_THRESHOLD: The
cam-usage of Ipv4Acl cam region on stack-unit 0
Portpipe 0 Pipeline 0 is below 95%.
98 100 100 No syslog
95 80 10 No syslog
92 90 89 No syslog
CAM Optimization
When you enable the CAM optimization, if a Policy Map containing classication 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 Proling
The following section describes CAM proling troubleshooting.
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
248
Content Addressable Memory (CAM)