Dell Force10 S4820T S4820T Configuration Guide - Page 591

mac learning-limit mac-address-sticky Using sticky MAC addresses allows you to associate a specific port with MAC addresses from trusted devices. If sticky MAC is enabled, the specified port will retain any dynamically-learned addresses and prevent them from being transferred or learned on other ports. If mac-learning-limit is configured and sticky MAC is enabled, all dynamically-learned addresses are converted to sticky MAC addresses for the selected port. Any new MAC addresses learned on this port will be 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 configured mac learn limit, any additional MAC addresses will be converted to sticky MACs on that interface. To remove all sticky MAC addresses from the running config file, disable sticky MAC and use the write config command. When sticky mac is enabled on an interface, dynamically-learned MAC addresses will not age, even if mac-learning-limit dynamic is enabled. If mac-learning-limit and mac-learning-limit dynamic are configured and sticky MAC is disabled, any dynamically-learned MAC addresses will age. mac learning-limit station-move c s z mac learning-limit station-move is available only on platforms: 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 Learning Limit Violation Actions are supported only on platforms: e S4820T . You can 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 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. learn-limit-violation log learn-limit-violation shutdown Command Mode INTERFACE INTERFACE Layer 2 | 591