Concept Guide

Configuring a Static MAC Address
A static entry is one that is not subject to aging. Enter static entries manually.
To create a static MAC address entry, use the following command.
● Create a static MAC address entry in the MAC address table.
CONFIGURATION mode
mac-address-table static
Displaying the MAC Address Table
To display the MAC address table, use the following command.
● Display the contents of the MAC address table.
EXEC Privilege mode
show mac-address-table [address | aging-time [vlan vlan-id]| count | dynamic | interface
| static | vlan]
○ address: displays the specified entry.
○ aging-time: displays the configured aging-time.
○ count: displays the number of dynamic and static entries for all VLANs, and the total number of entries.
○ dynamic: displays only dynamic entries.
○ interface: displays only entries for the specified interface.
○ static: displays only static entries.
○ vlan: displays only entries for the specified VLAN.
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:
● Setting the MAC Learning Limit
● mac learning-limit Dynamic
● 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 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.
Layer 2 437