Set this field to limit the number of (dynamic) MAC addresses that may be learned on a port in a
specified VLAN. For example, if you set this field to 5 on port 2 in VLAN 3, then only the devices
with these five learned MAC addresses may access port 2 in VLAN 3 at any one time. A sixth device
would have to wait until one of the five learned MAC addresses aged out.