Users Guide

• mac learning-limit mac-address-sticky
• mac learning-limit station-move
• Learning Limit Violation Actions
• Setting Station Move Violation Actions
• Recovering from Learning Limit and Station Move Violations
Dell 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 4/24
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 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
Setting the MAC Learning Limit
To set a MAC learning limit on an interface, use the following command.
• Specify the number of MAC addresses that the system can learn off a Layer 2 interface.
INTERFACE mode
mac learning-limit address_limit
Three options are available with the mac learning-limit command:
• dynamic
• no-station-move
• station-move
NOTE: An SNMP trap is available for mac learning-limit station-move. No other SNMP traps are
available for MAC Learning Limit, including limit violations.
mac learning-limit Dynamic
The MAC address table is stored on the Layer 2 forwarding information base (FIB) region of the CAM.
The Layer 2 FIB region allocates space for static MAC address entries and dynamic MAC address entries.
When you enable MAC learning limit, entries created on this port are static by default. When you configure
the dynamic option, learned MAC addresses are stored in the dynamic region and are subject to aging.
Entries created before this option is set are not affected.
Layer 2 519