Why?
What I mean is, what is the driver? This configuration is orders of magnitude more complex to implement and migrate to, so why is this deemed a necessity?
To answer your question, you can use either a forest to forest OR an external trust, although a forest to forest trust is recommended. With an external trust, now you're making things even more complex, and more likely than not asking for an environment that will lead you down the path of a consolidation project in 18 months or so because management, administration, and delegation has become untenable. So the first question, Why, is once again called for.
See point 1 under 'procedure' at
this link.
Rick
--
Adrienne Gusoff - "Opportunity knocked. My doorman threw him out."
