308 | Layer 2w w w . d e l l . c o m | s u p p o r t . d e l l . c o m MAC Learning Limit DynamicThe 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 youconfigure the dynamic option, learned MAC addresses are stored in the dynamic region and are subject toaging. Entries created before this option is set are not affected.MAC Learning Limit Station-MoveThe 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 systemclears the entry learned on the original interface and installs a new entry on the new interface.Learning Limit Violation ActionsTo configure the system to take an action when the MAC learning limit is reached on an interface and anew address is received, use one of the following options with the mac learning-limit command:Station Move Violation Actionsno-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 stationmoves in which a MAC address learnt off of a MAC-limited port is learnt on another port on same stackunit or different stack.Task Command Syntax Command ModeGenerate a system log message when the MAC learninglimit is exceeded.mac learn-limit-violation log INTERFACEShut down the interface and generate a system logmessage when the MAC learning limit is exceeded.mac learn-limit-violation shutdown INTERFACETask Command Syntax Command ModeGenerate a system log messageindicating a station move.mac station-move-violation log INTERFACEShut down the first port to learn theMAC address.mac station-move-violation shutdown-original INTERFACEShut down the second port to learn theMAC address.mac station-move-violation shutdown-offending INTERFACE
