DELL S50V User Manual

Layer 2 | 563

After you enable a MAC learning limit, MAC addresses learned on the port and entered in the MAC 
address table are static by default. If you configure the MAC learning 

 option, learned MAC 

addresses are stored in the dynamic region of the table and are subject to aging. Entries created before this 
option is set are not affected.

On the C-Series and S-Series, the MAC address table is stored in the Layer 2 FIB region of CAM. The 
Layer 2 FIB region allocates space for static MAC address entries and dynamic MAC address entries.

On the E-Series, the MAC address table is stored in the Layer 2 ACL region. All MAC address entries on 
the E-Series are dynamic. 

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The 

 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.

FTOS Behavior: If you do not configure the 

 option, the C-Series and S-Series do not detect 

station moves in which a MAC address learned off of a MAC-limited port is learned on another port on 
same line card. Therefore, FTOS does not take any configured station-move violation action. When a 
MAC address is relearned on any other linecard (any line card except the one to which the original 
MAC-limited port belongs), the station-move is detected, and the system takes the configured the 
violation action.