With SCCM 2012 one of the wonderful feature that you get is the SCCM Cross Forest Implementation Made A lot Easy !!

 

For the best case scenario your cross forests should have Kerberos Authentication Between them . Even if there is no kerberos Authentication A two way external trust , One way External trust , non trusted forests

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could be brought under one SCCM Site .

 

The only exception to this could be forests where strong DMZ restrictions/ Security restrictions  could be present .

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