Raise the domain and forest functional level to 2012 R2

Question

Raise the domain and forest functional level to 2012 R2

mike vaccaro 176

My D/C's are already 2012R2. I'm running 2008R2 AD now. My schema = 69. All my FSMO Roles are under 1 D/C.
I believe all i need to do is 'Active Dir. Domains & Trusts' and raise the level their first and then go to 'Active Dir. Users & Groups' and raise the level their.
Is this the correct order?
I know I'm a little behind...

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Answer 1

mike vaccaro 176

Does it matter which order is raise them?

Leon Laude 86,026 Reputation points

2021-11-16T19:27:41.413+00:00

Raise the domain functional level (DFL) first.
Anonymous

2021-11-16T19:28:04.947+00:00

I'd do the domain functional as first step. You can't raise the forest functional level before raising all domain functional levels

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Answer 2

Hi @mike vaccaro ,

First ensure that your domain and DCs are fully healthy before attempting to raise the domain and forest functional levels.

Check that all your DCs are working fine by running Dcdiag /v
Check that the AD replication is healthy by running repadmin /showrepl and repadmin /replsum
If any errors exists, correct them before raising the domain & forest functional levels
Raise the domain & forest functional levels

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If the reply was helpful please don't forget to upvote and/or accept as answer, thank you!

Best regards,
Leon

Answer 3

Anonymous

I'd start with DFL, more info here that may help you.

https://learn.microsoft.com/en-us/previous-versions/windows/it-pro/windows-server-2008-R2-and-2008/cc754918(v=ws.10)

https://blogs.technet.microsoft.com/askds/2011/06/14/what-is-the-impact-of-upgrading-the-domain-or-forest-functional-level/

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Raise the domain and forest functional level to 2012 R2

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