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Dell EMC Configuration Guide for the S4048T–ON System 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 TenGigabitEthernet 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

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