RODC domain level 2008 to 2012r2

Hi all experts,

We have an environment with a Domain contoso.local with 2 DC’s and 1 Subdomain schools.contoso.local with 2 DC’s and 5 RODC’s. Domainlevel is 2008R2.
We want to raise the domain to 2012 r2 without update the RODC’s, only the main DC’s on contoso.local and schools.contoso.local should be 2012 R2.

What would be the correct way to achieve this?

According to Microsoft we only have to “adprep” and “domainprep” on the 4 main DC’s. rodcprep is not necessary on those 4 main DC’s or  is it? Also do we have to do something on the RODC’s as well?

Thank you for your replies

Thomas UAsked:
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Toni UranjekConsultant/TrainerCommented:
"rodcprep" is not necessary, but you will have to upgrade ALL DCs (including RODCs) to Windows Server 2012 R2, before you will be able to rise DFL to Windows Server 2012 R2.
Will SzymkowskiSenior Solution ArchitectCommented:
RODC's get their replication from "other" 2008 domain controllers. They do not talk directly to 2012 R/W DC's. As stated you will only be able to raise the Domain/Forest functional level once you have removed all of the 2008 DC's this includes RODC's as well.

The /rodcprep for 2012R2 allows you to have RODC's that run 2012R2 after you have preped the domain.

Thomas UAuthor Commented:

we don't want to raise the DFL. We just want to replace the 2008er Domain Controller with 2012r2 (not the rodcs). Is this true, that the 2008 don't "talk" with the 2012r2, even the DFL is still 2008er?

Toni UranjekConsultant/TrainerCommented:
If you leave DFL at 2008, you do not have to upgrade RODCs.
When you will want to raise DFL to 2012, you will have to ugrade RODCs to Windows 2012 too.

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Thomas UAuthor Commented:
Okay, that's great. Thank you!

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Windows Server 2008

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