Dell PowerSwitch S4820T Configuration Guide for the S4820T System 9.112.0P1 - Page 507

When you enable sticky mac on an interface, dynamically-learned MAC addresses do not age, even if you enabled mac-learninglimit 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-move The mac learning-limit station-move command allows a MAC address already in the table to be learned from 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. mac learning-limit no-station-move The no-station-move option, also known as "sticky MAC," provides additional port security by preventing a station move. When you configure this option, the first entry in the table is maintained instead of creating an entry on the new interface. no-stationmove is the default behavior. Entries created before you set this option are 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 mode show mac learning-limit Dell Networking OS Behavior: The systems do not generate a station-move violation log entry for physical interfaces or port-channels when you configure mac learning-limit or when you configure mac learning-limit station-move-violation log. Dell Networking OS detects a station-move violation only when you configure mac learning-limit dynamic and logs the violation only when you configure the mac learning-limit station-move-violation log, as shown in the following example. Dell(conf-if-te-1/1)#show config ! interface TenGigabitEthernet 1/1 no ip address switchport mac learning-limit 1 dynamic no-station-move mac learning-limit station-move-violation log no shutdown 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 using one the following options with the mac learning-limit command, use the following commands. • Generate a system log message when the MAC learning limit is exceeded. INTERFACE mode learn-limit-violation log • Shut down the interface and generate a system log message when the MAC learning limit is exceeded. INTERFACE mode learn-limit-violation shutdown Layer 2 507