mac learning-limit mac-address-stickyUsing sticky MAC addresses allows you to associate a specific port with MAC addresses from trusteddevices. If you enable sticky MAC, the specified port retains any dynamically-learned addresses andprevents them from being transferred or learned on other ports.If you configure mac-learning-limit and you enabled sticky MAC, all dynamically-learned addressesare converted to sticky MAC addresses for the selected port. Any new MAC addresses learned on this portis converted to sticky MAC addresses.To save all sticky MAC addresses into a configuration file that can be used as a startup configuration file,use the write config command. If the number of existing MAC addresses is fewer than the configuredmac learn limit, any additional MAC addresses are converted to sticky MACs on that interface. To removeall sticky MAC addresses from the running config file, disable sticky MAC and use the write configcommand.When you enable sticky mac on an interface, dynamically-learned MAC addresses do not age, even if youenabled mac-learning-limit dynamic. If you configured mac-learning-limit and mac-learning-limit dynamic and you disabled sticky MAC, any dynamically-learned MAC addresses ages.mac learning-limit station-moveThe mac learning-limit station-move command is available on the Z9000 platform.The station-move option, allows a MAC address already in the table to be learned off of anotherinterface. For example, if you disconnect a network device from one interface and reconnect it toanother interface, the MAC address is learned on the new interface. When the system detects this “stationmove,” the system clears the entry learned on the original interface and installs a new entry on the newinterface.mac learning-limit no-station-moveThe no-station-move option, also known as “sticky MAC,” provides additional port security bypreventing a station move.When you configure this option, the first entry in the table is maintained instead of creating an entry onthe new interface. no-station-move is the default behavior. Entries created before you set this optionare not affected.To display a list of all interfaces with a MAC learning limit, use the following command.Display a list of all interfaces with a MAC learning limit.EXEC Privilege modeshow mac learning-limitDell Networking OS Behavior: The systems do not generate a station-move violation log entry forphysical interfaces or port-channels when you configure mac learning-limit or when you configuremac learning-limit station-move-violation log. Dell Networking OS detects a station-moveviolation only when you configure mac learning-limit dynamic and logs the violation only whenyou configure the mac learning-limit station-move-violation log, as shown in the followingexample.Dell(conf-if-gi-1/1)#show config!interface GigabitEthernet 1/1450 Layer 2
