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Dell EMC Configuration Guide for the S3100 Series 9.14.2.4

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MAC Learning Limit

MAC address learning limit is a method of port security on Layer 2 port-channel and physical interfaces, and VLANs. It allows you to set an upper limit on the number of MAC addresses that learned on an interface/VLAN. After the limit is reached, the system drops all traffic from a device with an unlearned MAC address.

This section describes the following:

Dell EMC Networking OS Behavior: When configuring the MAC learning limit on a port or VLAN, the configuration is accepted (becomes part of running-config and show mac learning-limit interface) before the system verifies that sufficient CAM space exists. If the CAM check fails, a message is displayed:

%E90MH:5 %ACL_AGENT-2-ACL_AGENT_LIST_ERROR: Unable to apply access-list Mac-Limit on GigabitEthernet 1/24

In this case, the configuration is still present in the running-config and show output. Remove the configuration before re-applying a MAC learning limit with a lower value. Also, ensure that you can view the Syslog messages on your session.

NOTE The CAM-check failure message beginning in Dell EMC Networking OS version 8.3.1.0 is different from versions 8.2.1.1 and earlier, which read:
% Error: ACL returned error
% Error: Remove existing limit configuration if it was configured before
NOTE When the system receives SLF packets with about 25000 packets per second and 2500 packets per burst, the system does not learn all MAC addresses. The system learns all MAC addresses on subsequent reception of packets.

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