This write-only-in-practice value adds learned ARP table entries to the static binding table, scoped to specific ports, with reading it back being meaningless. An admin uses this to freeze ARP entries only on selected ports rather than the whole switch, useful when only certain access ports need to be locked down against ARP spoofing. For example, setting this object to a specific port list would convert only the ARP entries learned on those ports into static bindings, leaving other ports' entries dynamic.