Lobos Tech LB-FEA800M - Manual (Page 33)

4-3-7.Misc Configuration
4-3-7-1.Port Security
A port in security mode will be “locked” without permission of address
learning. Only the incoming packets with SMAC already existing in the
address table can be forwarded normally. User can disable the port from
learning any new MAC addresses, and then use the static MAC
addresses screen to define a list of MAC addresses that can use the
secure port.