How functional levels work

Michael Adam obnox at
Mon Apr 11 05:35:53 UTC 2016

On 2016-04-10 at 20:29 +0100, Rowland Penny wrote:
> On 10/04/16 20:15, Andrew Bartlett wrote:
> >
> >The DC functional level is (emulating) the software version of windows
> >it is.  It tells you how high you can move the forest and domain
> >functional levels, because of course you can't have them higher than
> >the lowest (oldest) server.
> >
> >Andrew Bartlett
> >
> Sorry, still don't understand this :-)
> From what you are saying, if another DC is joined, this sets what the
> functional level can be raised to, but you also say it cannot be higher than
> the lowest server.
> So:
> original DC:
> Domain function level: (Windows) 2000
> New DC:
> Lowest function level of a DC: (Windows) 2008 R2
> From that, the second DC could be raised to '2008 R2' , this is higher than
> the lowest server, or am I still missing something ?????
> Totally lost here.

I think the only thing you are missing is that the explicitly
configured lower bound of domain/forest functional level is not
automatically raised with the de facto minimum of functional
levels of existing DCs. It is only changed by an explicit admin

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