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I have tested DHCP snooping and was able to block a rogue DHCP server on switch and allow the unchecked port to pass DHCP and also to block rogue when no other servers were present. What I have not tested is an UBNT AP with SU's (client isolation checked) and rogue client DHCP servers behind the SU's. I am hoping that will block requests on from the same port.

Tom Fadgen

Anything further on this? Outside of checking DS on the offending ports?.