Command Reference Guide

922 | Layer 2
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Usage
Information
This command and its options are supported on physical interfaces, static LAGs, LACP
LAGs, and VLANs.
If the
vlan option is not specified, then the MAC address counters is not VLAN-based. That
is, the sum of the addresses learned on all VLANs (not having any learning limit
configuration) is counted against the MAC learning limit.
MAC Learning Limit violation logs and actions are not available on a per-VLAN basis.
With
the keyword no-station-move option, MAC addresses learned through this feature on the
selected interface will persist
on a per-VLAN basis, even if received on another interface.
Enabling or disabling this option has no effect on already learned MAC addresses.
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,
un-configure 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.
Version 8.3.1.0 Added vlan option on E-Series.
Version 8.2.1.0 Introduced on S-Series
Version 7.7.1.0 Introduced on C-Series; added station-move option
Version 6.5.1.0 Added support for MAC Learning-Limit on LAG
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.