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Demoting a 2003 Domain Controller and How Sites Are Affected

Adding and removing a new domain controller and have a question about any additional steps I need to take, beyond the standard ones.

The situation is a network with two AD sites.  Each site originally had one domain controller.  At one site, we are adding a 2008 R2 DC, and removing the old 2003 DC.

Poking around in Active Directory Sites and Services, I notice that there are replication links set up between the original two servers, and the old server and new server on the same site (but not between new server and old server on the different site).  Do I need to do anything here (New Active Directory Connection)?  I'm assuming so, since I'd like to shut off the old DC first, to test that nothing breaks.  Looking at how things are now, there will be no replication if I do this.  

Moving the FSMO roles won't be necessary, since those are on the lone DC at the other site.  I've done (I believe) all of the dcdiag/netdiag testing, to test communication between Domain Controllers, and that all seems good.  
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netperf
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netperf
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KenMcFCommented:
As long as you did not create any manaual links they should be recreated automatically.  If you go into S&S under the server object and NTDS settings, it should say <auotmatically genterated> for the name.  When the old DC is demoted the KCC will rebuild all auto genterated links.
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sukhijavikasCommented:
Some times while removing the dc meta data remaains , so you have to use ntds util to remove meta data ..from AD.
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netperfAuthor Commented:
So if I wanted to shut the old DC down for a couple days as a test, I should go and create those manually, since it won't recreate them until I demote it?
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KenMcFCommented:
No, Do not create the links manually. Let the KCC handle all the links. You can shut the DC down then either wait for the KCC to run and rebuild the links or run "Check Replication Topology" in sites and services.
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