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Windows Server 2012 & 2008 R2 DC

Posted on 2015-02-09
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Last Modified: 2015-02-09
I currently have a Windows Server 2012 domain controller, can I add a Windows server 2008 r2 to be an additional DC?
If so. how? I can find plenty of explanation of how to add a 2012 server to an existing server 2008 domain but not the other way.
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Question by:Jock_Scotland
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Patrick Bogers earned 500 total points
ID: 40598138
Hi

It depends what functional level your 2012 DC is running, if 2012 or higher you cannot add a 2008R2.
Please check this link.

To be short, ONLY if your functional level is 2008R2 you can add a 2008 R2 domain controller.

How to find? open powershell and run:
Import-Module -Name ActiveDirectory
Next run:
Get-ADForest | Format-Table Name , ForestMode

Your functional level shows on the right. If it is 2012 or higher there are possibilities on lowering the level but there are culprits when doing this.
Which ones? please read into functionality per functional level.
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Author Comment

by:Jock_Scotland
ID: 40598150
That's great, thanks for the info.
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LVL 23

Expert Comment

by:Patrick Bogers
ID: 40598177
Glad i could help.
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