Hi,I need to lock one of the Ethernet interfaces on a router to a specific MAC address so only one device is allowed to use it. I haven't been able to find any way in which the ACL enables filtering on MAC address.Any ideas please ?Thanks.

I don't have access to a lab router at the moment and have been asked if it's possible to administratively shutdown a sub interface.I think the answer is no, could someone please confirm.Thanks.Farouq Taj.