Dell Force10 MXL Blade MXL 10/40GbE Switch IO Module Configuration Guide - Page 310
MAC Learning Limit Dynamic, MAC Learning Limit Station-Move, Learning Limit Violation Actions
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www.dell.com | support.dell.com 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. 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. 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: Task Command Syntax Generate a system log message when the MAC learning limit is exceeded. Shut down the interface and generate a system log message when the MAC learning limit is exceeded. mac learn-limit-violation log mac learn-limit-violation shutdown Command Mode INTERFACE INTERFACE 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:. Task Generate a system log message indicating a station move. Shut down the first port to learn the MAC address. Shut down the second port to learn the MAC address. Command Syntax mac station-move-violation log mac station-move-violation shutdown-original mac station-move-violation shutdown-offending Command Mode INTERFACE INTERFACE INTERFACE 308 | Layer 2
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