Clients not seeing new 2012 DHCP server after moving from 2008

We have moved from 2008 DC's to 2012r2 . FSMO roles have been moved and DHCP has been set up on the new servers in failover mode.  Export/import was successfull and the scope was authorized. The issue im having is once i deauthorize the 2008 scope clients can no longer contach the DHCP sevrer on the new 2012 servers.
matthenkelAsked:
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Britt ThompsonConnect With a Mentor Sr. Systems EngineerCommented:
Ok, say your DHCP servers are in a different site or on a separate VLAN on a different floor in the office building. Your switches or routers will have a configuration called an ip-helper address that points to your dhcp server.

Say you have a router or layer 3 switch that all clients use as a gateway for each subnet. That gateway router that each client uses would have a helper address that tells the client where to go for DHCP. You'd need to login to those switches or routers via the web console or command line to make the necessary changes.

This is only assuming that the systems are on separate subnets
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Britt ThompsonSr. Systems EngineerCommented:
Are these 2012 servers in a datacenter / cross-subnet from the client machines by any chance? if so, you may need to update the IP-HELPER addresses on your switches or routers so the clients know how to find the servers.
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matthenkelAuthor Commented:
Not in a data center but we do run a ton of subnets . Where would I check the ip-helper addresses
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