In DFS, How to make servers LEAST COST for different subnets.

Hello, We setup DFS in our domain (SERVER1) and we replicated the DFS namespace into a server which is also a member of the domain but it is on a DIFFERENT SUBNET (let's call this server SERVER2).
How can I make sure that the SERVER2 DFS redirection should NOT go to SERVER1 unless SERVER2 is down, etc.? or How do we make sure SERVER2 clients don’t go to the wrong site and vice versa WHEN we enable DFS on multiple systems?

I have also enable least expensive target selection (site-costing) in DFS but I am not sure if that will work.

Note: SERVER2 is not a Domain Controller
SERVER1 is Server 2008 Standard
SERVER2 is Server 2008 R2 Standard

Please help and Thank you in advance.

Regards,
Rod

---

--- Network Security Administrator