[c-nsp] port security / prevent learning mac address

[Mike]

Hello,

	Is there a cisco feature that will learn a mac address on a port, and 
then refuse to learn that mac address from any other source? I have a 
small number of some critical network devices that I'd like to make sure 
cannot have their mac addresses spoofed or usurped due to loops or other 
network causes. How would this work? I have a 3560 with ipbase software.

Mike-