Reference Guide

742 | Layer 2
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Once the MAC address learning limit is reached, the MAC addresses do not age out unless
you add the dynamic option. To clear statistics on MAC address learning, use the clear
counters command with the learning-limit parameter.
When a channel member is added to a port-channel and there is not enough ACL CAM space,
then the MAC limit functionality on that port-channel is undefined. When this occurs,
unconfigure the existing configuration first and then reapply the limit with a lower value.
Related
Commands
mac learning-limit learn-limit-violation
c e s z
Configure an action for a MAC address learning-limit violation.
Syntax
mac learning-limit learn-limit-violation {log | shutdown}
To return to the default, use the no mac learning-limit learn-limit-violation {log | shutdown}
command.
Parameters
Defaults
No default behavior or values
Command Modes
INTERFACE (conf-if-interface-slot/port)
Command
History
Usage
Information
This is supported on physical interfaces, static LAGs, and LACP LAGs.
Related
Commands
Note: If you configure this command on an interface in a routed VLAN, and once the MAC
addresses learned reaches the limit set in the mac learning-limit command, IP protocols are
affected. For example, VRRP sets multiple VRRP Masters, and OSPF may not come up.
clear counters
Clear counters used in the
show interface command
clear mac-address-table Clear the MAC address table of all MAC address learned dynamically.
show mac learning-limit Display MAC learning-limit configuration.
log Enter the keyword log to generate a syslog message on a learning-limit
violation.
shutdown
Enter the keyword shutdown to shut down the port on a learning-limit
violation.
Version 8.3.11.1 Introduced on the Z9000.
Version 8.2.1.0 Introduced on S-Series
Version 7.8.1.0 Introduced on C-Series
Version 7.5.1.0 Introduced on E-Series
show mac learning-limit Display details of the mac learning-limit