Erhan,
I believe you are referring to the MAC Address Locking feature. This was recently added in EXOS 15.7. The equivalent EXOS configuration would be the following:
enable mac-locking
enable mac-locking port 1
configure mac-locking port 1 static add station 11:11:11:11:11:11 #Note this particular MAC address will not work as it is a multicast MAC
configure mac-locking ports 1 static limit-learning 1 #Only allows one static entry to be added to the port
For more details on MAC Locking you may want to take a look at the
15.7 User Guide starting on page 873.