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fsdg-2871 avatar image
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fsdg-2871 asked DSPatrick commented

DC different versions

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?

windows-active-directory
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DSPatrick avatar image
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DSPatrick answered DSPatrick commented

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

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Just checking if there's any progress or updates?

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LimitlessTechnology-2700 avatar image
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LimitlessTechnology-2700 answered

Hello @fsdg-2871

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://docs.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,

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