If I want to setup a trust between to forests with a single DC in each forest, then it's pretty much out of the box.
But what if there are multiple DC's in each forest?
I have two forest:
A: Two DC's (Windows Server 2008 R2)
B: Four DC's (Two Windows Server 2008 R2 / Two Windows Server 2012)
How do I setup the trust between theese two forests?
Must I take the necessary steps on all DC's or can it be done on one DC in each forest?