It is not transitive
Mary loves John and John loves Mary  . John loves Dad and Dad loves John. It 
doesn't mean that Dad loves Mary !
 
GuidoElia
HELPPC
 

  _____  

Da: Paul Gordon [mailto:[email protected]] 
Inviato: venerdì 12 novembre 2010 11.24
A: NT System Admin Issues
Oggetto: Forest trust transitivy limit?



I have an interesting conundrum that I'm pondering which has raised the 
question of just how transitive are forest trusts?

 

With 2 forests, it's quite straightforward; with a forest trust between them, 
the transitivity extends down the domain tree in each forest, eliminating the 
need for external domain trusts between individual domains within each forest 
(although of course shortcut trusts can still be useful).

 

But what about when there are more than 2 forests? - take a scenario with 3 
forests: FORESTA ß---forest trust---à FORESTB ß---forest trust---à FORESTC

 

So there is a forest trust between A & B, and between B &C.... - does FORESTA 
thus trust FORESTC?? - since in theory forest trusts are transitive, one might 
be inclined to think the answer to this should be yes, but I'm not convinced 
the transitivity is supposed to work this way...

 

BTW, the conundrum that has prompted this question is that I have a scenario 
where I'm being asked to suggest a migration strategy between two AD domains 
(in separate forests) that have the SAME domain NetBIOS name... (Ugh!) the only 
way I see this being possible is to use an intermediate domain and a 2-step 
migration, since it simply isn't going to be possible to migrate directly 
between two identically named domains... Two different strategy suggestions are 
under consideration for how/where to implement the intermediate domain, one of 
which is to keep it entirely separate from the existing production forests at 
either end of the migration...

 

Thoughts?

 

TIA

 

Paul G.

 

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