564 | Layer 2w w w . d e l l . c o m | s u p p o r t . d e l l . c o m mac learning-limit no-station-moveThe no-station-move option, also known as “sticky MAC,” provides additional port security bypreventing a station move. When this option is configured, the first entry in the table is maintained insteadof creating a new entry on the new interface. no-station-move is the default behavior. Entries created beforethis option is set are not affected.mac learning-limit stickyThe sticky-MAC learning feature is supported on platforms: c s.You can provide security for the dynamically-learned MAC addresses of trusted devices that are allowed toaccess a port by configuring the sticky option. This MAC learning option allows a switch to maintain theassociation of a trusted MAC address with a port and prevents a device from accessing the switch onanother interface until the option is disabled.Trusted MAC addresses are added to the running configuration and “stick” to the port on which they arelearned even if an interface goes down and comes back up. If you save sticky MAC addresses to thestart-up configuration file by entering the write config command, the addresses are deleted from therunning-configuration, do not have to be dynamically relearned, and do not change when the switchreboots. Any sticky MAC addresses learned after the write config is performed are not saved after a reboot.The sticky MAC address option is supported on physical port and port-channel interfaces; it is notsupported on VLAN interfaces.Static MAC addresses have a higher preference than sticky MAC addresses and are therefore not convertedwith sticky-MAC learning.Note: Sticky MAC is not supported on the S25 or S50 in FTOS release 8.4.2.6.FTOS Behavior: The C-Series and S-Series do not generate a station-move violation log entry forphysical interfaces or port-channels when you configure mac learning-limit or when you configure maclearning-limit station-move-violation log. FTOS detects a station-move violation only when youconfigure mac learning-limit dynamic, and logs the violation only when you configure the maclearning-limit station-move-violation log, as shown below:FTOS(conf-if-gi-1/1)#show config!interface GigabitEthernet 1/1no ip addressswitchportmac learning-limit 1 dynamic no-station-movemac learning-limit station-move-violation logno shutdownNote: Sticky MAC is not supported on the S25 or S50 in FTOS release 8.4.2.6.
