308 | Layer 2
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MAC Learning Limit Dynamic
The MAC address table is stored on the Layer 2 forwarding information base (FIB) region of the CAM.
The Layer 2 FIB region allocates space for static MAC address entries and dynamic MAC address entries.
When you enable MAC learning limit, entries created on this port are static by default. When you
configure the
dynamic option, learned MAC addresses are stored in the dynamic region and are subject to
aging. Entries created before this option is set are not affected.
MAC Learning Limit Station-Move
The station-move option allows a MAC address already in the table to be learned off of another interface.
For example, if you disconnect a network device from one interface and reconnect it to another interface,
the MAC address is learned on the new interface. When the system detects this “station move,” the system
clears the entry learned on the original interface and installs a new entry on the new interface.
Learning Limit Violation Actions
To configure the system to take an action when the MAC learning limit is reached on an interface and a
new address is received, use one of the following options with the
mac learning-limit command:
Station Move Violation Actions
no-station-move is the default behavior. To configure the system to take an action if a station move occurs,
use one of the following options with the
mac learning-limit command:.
FTOS Behavior: If you do not configure the dynamic option, the MXL Switch does not detect station
moves in which a MAC address learnt off of a MAC-limited port is learnt on another port on same stack
unit or different stack.
Task Command Syntax Command Mode
Generate a system log message when the MAC learning
limit is exceeded.
mac learn-limit-violation log
INTERFACE
Shut down the interface and generate a system log
message when the MAC learning limit is exceeded.
mac learn-limit-violation shutdown
INTERFACE
Task Command Syntax Command Mode
Generate a system log message
indicating a station move.
mac station-move-violation log
INTERFACE
Shut down the first port to learn the
MAC address.
mac station-move-violation shutdown-original
INTERFACE
Shut down the second port to learn the
MAC address.
mac station-move-violation shutdown-offending
INTERFACE
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