DC different versions

fsdg 986 Reputation points
2021-09-14T13:46:32.927+00:00

Hello,

is it supported to have a secondary domain controller on a different version of server? The primary domain controller would be 2012 R2 and the secondary 2016.
Is it anything that can go wrong in this kind of configuration?

Active Directory
Active Directory
A set of directory-based technologies included in Windows Server.
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  1. Dave Patrick 426.3K Reputation points MVP
    2021-09-14T13:48:24.277+00:00

    Absolutely not a problem and a very common situation. The highest DFL in this situation is 2012 R2
    https://learn.microsoft.com/en-us/windows-server/identity/ad-ds/active-directory-functional-levels

    --please don't forget to upvote and Accept as answer if the reply is helpful--

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  1. Limitless Technology 39,471 Reputation points
    2021-09-14T15:51:37.453+00:00

    Hello @fsdg

    You shouldn't have any issues introducing a Server 2016 into a Windows Server 2012R2 domain. This is a totally regular operation.

    First of all, I would recommend to run a DCDIAG command to check the health of your current DC before promoting, after that just follow the usual promotion proces. I would also recommend to add the DNS role into the new server and make it Global Catalog, for redundancy.

    You can find some guidelines and screenshots of the promotion process here: https://learn.microsoft.com/en-us/windows-server/identity/ad-ds/deploy/upgrade-domain-controllers .This may also help you in case you wat to rise the Functional Level of your domain to 2016, keeping the 2012R2 as secondary and 2016 as primary.

    Hope this helps in your case,
    Best regards,

    1 person found this answer helpful.
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