Windows Server 2012 & 2008 R2 DC

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.
Jock_ScotlandAsked:
Who is Participating?
 
Patrick BogersDatacenter platform engineer LindowsCommented:
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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Jock_ScotlandAuthor Commented:
That's great, thanks for the info.
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Patrick BogersDatacenter platform engineer LindowsCommented:
Glad i could help.
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