Look at ACL rules. I've never used them so I can't give you examples, but MAC filtering is in the options.
RB750Gr3, RB750r2, CRS326-24G-2S (in SwitchOS), CSS326-24G-2S, CSS106-5G-1S, RB260GS
Not sure if I beat them in submission, or they beat me into submission Warning: I know enough to be dangerous...