Administrator Guide

Conguring mac-address-table station-move time-interval 500 solves this limitation. Reducing the scanning
interval to the minimum (500 milliseconds), increases the detection speed, which results in the system clearing entries closer to the
actual desired aging time.
Conguring 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 specied entry.
– aging-time: displays the congured 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 specied interface.
– static: displays only static entries.
– vlan: displays only entries for the specied 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 trac from a device with an unlearned MAC address.
This section describes the following:
• mac learning-limit Dynamic
• 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 conguring the MAC learning limit on a port, the conguration is accepted (becomes part of
running-config and show mac learning-limit interface) before the system veries that sucient CAM space
exists. If the CAM check fails, a message displays:
%E90MH:5 %ACL_AGENT-2-ACL_AGENT_LIST_ERROR: Unable to apply access-list Mac-Limit on
GigabitEthernet 5/84
In this case, the conguration is still present in the running-config and show output. Remove the conguration before re-
applying a MAC learning limit with a lower value. Also, ensure that you can view the Syslog messages on your session.
Layer 2
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