Administrator Guide

show mac learning-limit
Learning Limit Violation Actions
Learning limit violation actions are user-configurable.
To configure the system to take an action when the MAC learning limit is reached on an interface and a new address is received
using one the following options with the mac learning-limit command, use the following commands.
● Generate a system log message when the MAC learning limit is exceeded.
INTERFACE mode
learn-limit-violation log
● Shut down the interface and generate a system log message when the MAC learning limit is exceeded.
INTERFACE mode
learn-limit-violation shutdown
Setting Station Move Violation Actions
Station move violation actions are user-configurable.
no-station-move is the default behavior. You can configure the system to take an action if a station move occurs using one
the following options with the mac learning-limit command.
To display a list of interfaces configured with MAC learning limit or station move violation actions, use the following commands.
● Generate a system log message indicating a station move.
INTERFACE mode
station-move-violation log
● Shut down the first port to learn the MAC address.
INTERFACE mode
station-move-violation shutdown-original
● Shut down the second port to learn the MAC address.
INTERFACE mode
station-move-violation shutdown-offending
● Shut down both the first and second port to learn the MAC address.
INTERFACE mode
station-move-violation shutdown-both
● Display a list of all of the interfaces configured with MAC learning limit or station move violation.
CONFIGURATION mode
show mac learning-limit violate-action
Recovering from Learning Limit and Station Move Violations
After a learning-limit or station-move violation shuts down an interface, you must manually reset it.
To reset the learning limit, use the following commands.
NOTE:
Alternatively, you can reset the interface by shutting it down using the shutdown command and then re-enabling it
using the no shutdown command.
● Reset interfaces in the ERR_Disabled state caused by a learning limit violation or station move violation.
EXEC Privilege mode
mac learning-limit reset
● Reset interfaces in the ERR_Disabled state caused by a learning limit violation.
EXEC Privilege mode
mac learning-limit reset learn-limit-violation [interface | all]
● Reset interfaces in the ERR_Disabled state caused by a station move violation.
Layer 2
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