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Active Directory Sites And Services

Posted on 2013-11-01
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Last Modified: 2013-11-04
We have our corporate office with 2 domain contollers and 1 offsite domain controller
A and B are at the corporate office and C is offsite. Right now thru active directory sites and services we have A replicating with B, and B replicating with C. Should this be setup so that all domain controllers replicate to eachother too?
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Question by:portillosjohn
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Expert Comment

by:convergint
ID: 39616733
Ideally yes so you have a fully redundant Active Directory.  But it is also not a requirement either.
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Expert Comment

by:Seth Simmons
ID: 39616742
just to add, you could setup an additional link at a higher cost between A and C so that if the B-C link broke (server down, etc.) then C would still be able to talk directly to A

i had done that at my previous place between 4 different sites; redundant links at a higher cost and worked fine for us
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LVL 57

Expert Comment

by:Mike Kline
ID: 39616774
Right now do you have one site in active directory or two sites.   The KCC is building those connection objects for you and if replication is working fine I'd leave it as is.

Thanks

Mike
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Author Comment

by:portillosjohn
ID: 39616858
Right now we have 2 sites. 1 site has DCs A and B and the other site has DC C.
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Expert Comment

by:Mike Kline
ID: 39616877
Then they don't all need connections to each other.  As long as replication is working (repadmin or the ad replication status tool can help verify that0.

Thanks


Mike
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Author Comment

by:portillosjohn
ID: 39616886
So if we were going to add a 3rd site with DC D how should the repliacation go?
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Expert Comment

by:Mike Kline
ID: 39616917
I'm guessing the third site will have connectivity with HQ?   I'd add a site link between HQ and Site 3 and let the KCC build the connection objects.

Thanks

Mike
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Accepted Solution

by:
rajivkumar07 earned 500 total points
ID: 39617008
Rule of the thumb = Distance.

For example - If you have 2 DCs ( A & B) in Ohio, 1 DC ( C ) in California, 1 DC ( D ) in New York.

Replication should be something like this -

A < > B
A and B < > C
A and B < > D
C and D don't need replication, however, if you want, yes you can set it up with the low priority level.
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