Dell PowerEdge FN I/O Module Command Line Reference Guide 9.10(0.0)

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mac learning-limit

Limit the maximum number of MAC addresses (static + dynamic) learned on a selected interface.

Syntax

mac learning-limit address_limit [dyanmic] [no-station-move| station-move][sticky]

Parameters

address_limit	Enter the maximum number of MAC addresses that can be learned on the interface. The range is from 1 to 1000000.
dynamic	(OPTIONAL) Enter the keyword `dynamic` to allow aging of MACs even though a learning limit is configured.
no-station-move	(OPTIONAL) Enter the keywords `no-station-move` to disallow a station move (associate the learned MAC address with the most recently accessed port) on learned MAC addresses.
station-move	(OPTIONAL) Enter the keywords `station-move` to allow a station move on learned MAC addresses.
sticky	(OPTIONAL) Enter the keyword `sticky` to allow configuring the sticky mac feature along with the learning limit.

Defaults

dynamic

NOTE: “Static” means manually entered addresses, which do not age.

Command Modes

INTERFACE

Supported Modes

Full–Switch

Command History

Version	Description
9.9(0.0)	Introduced on the FN IOM.
8.3.16.1	Introduced on the MXL 10/40GbE Switch IO Module.

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.

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 dynamic — clears the MAC address table of all MAC address learned dynamically.

show mac learning-limit — displays MAC learning-limit configuration.