Historically, when you have 2 DCs for failover purposes and you want DHCP in the mix, you install the DHCP role on both DCs with the same scope(s) divided between them. This is called ‘split scope’. Both DCs know about the entire range, but one issues IPs out of the first half, while the other one issues IPs from the other half. See this MS article found by :google:: https://technet.microsoft.com/en-us/library/hh831385.aspx
I wonder why it is necessary to set up a dhcp failover cluster, because if my DC1 provides IPs from 192.168.1.100 to 150, and DC2 from 151 to 200 … well, if DC1 fails I still have DC2 to provide IPs to the clients.
P.S : I came across a Windows 2012 video tutorial explaining just that Ossian, and it was so easy to set up!
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