For inter-site replication, you can also do this manualy using ADSIEdit.
Select configuration Container --> Sites and locate the site of the DC to
which you want to transfer ISTG role to. Select NTDS Site Settings class and
go into properties. The attribute interSiteTopologyGenerator.
Each DC in a site creates its intrasite topology and this is done by KCC on
each DC.
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Regards
Matjaz Ladava, MCSE, MCSA, MCT, MVP
Microsoft MVP - Active Directory
(e-mail address removed), (e-mail address removed)
http://ladava.com