Administrator Guide

Version Description
8.3.19.0 Introduced on the S4820T.
8.3.11.1 Introduced on the Z9000.
8.3.12.0 Deprecated the no-station-move command (replaced by the mac-learning-
limit mac-address-sticky command).
8.3.7.0 Introduced on the S4810.
8.3.1.0 Added the vlan option on the E-Series.
8.2.1.0 Introduced on the S-Series.
7.7.1.0 Introduced on the C-Series. Added the station-move option.
6.5.1.0 Added support for MAC Learning-Limit on the LAG.
Usage Information
This command and its options are supported on physical interfaces, static LAGs, LACP LAGs, and VLANs.
If you do not specify the vlan option, the MAC address counters are 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 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.
After 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.
NOTE: If you configure this command on an interface in a routed VLAN, and after 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.
When a channel member is added to a port-channel and there is not enough ACL CAM space, 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
• clear counters — Clear counters used in the show interface command.
• clear mac-address-table — clears the MAC address table of all MAC address learned dynamically.
• mac learning-limit mac-address-sticky — Replaces deprecated no-station-move parameter.
• show mac learning-limit — displays MAC learning-limit configuration.
mac learning-limit learn-limit-violation
Configure an action for a MAC address learning-limit violation.
C9000 Series
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
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.
Defaults none
Command Modes INTERFACE (conf-if-interface-slot/port)
974 Layer 2