Reference Guide

mac learning-limit mac-address-sticky
Using sticky MAC addresses allows you to associate a specific port with MAC addresses from trusted
devices. If you enable sticky MAC, the specified port retains any dynamically-learned addresses and
prevents them from being transferred or learned on other ports.
If you configure mac-learning-limit and you enabled sticky MAC, all dynamically-learned addresses
are converted to sticky MAC addresses for the selected port. Any new MAC addresses learned on this port
is 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 are 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 you enable sticky mac on an interface, dynamically-learned MAC addresses do not age, even if you
enabled 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-move
The mac learning-limit station-move command is available on the S4820T platform.
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.
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-station-move 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-gi-1/1)#show config
!
interface GigabitEthernet 1/1
558
Layer 2