Hi, yes, not a lot of info out there to go on is there!? I was unable to enable the DHCP relay option as the switch is already the DHCP server (It will not permit enabling if the DHCP server is the switch). I enabled DHCP snooping globally and set all interfaces to Trusted, but this made no difference. I was unsure why this feature for DHCP security would have a positive effect anyway. From reading about this it appears to be used to prevent MITM attacks with rogue DHCP servers. Perhaps I'm overlooking something fundamental here? I think I will try changing the DHCP server back to the ASA router this evening and see if I can enable an IP Helper on the router. I read that this is the preferred method for use with MDT (over DHCP Options).
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