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Multiple SCCM 2012 hierarchies in the same AD forest?

I'm having trouble finding much information on whether or not it is possible to install multiple SCCM 2012 hierarchies in the same Active Directory forest.  We have a 2 domain forest: the root domain and one child domain.  Each domain has a different set of IT admins that report up different sides of the company org chart, each IT group does their own thing other than the rare occasions that Enterprise Admins or Schema Admins need to get involved.  We have a SCCM 2012 sp1 CU3 hierarchy installed into the root domain.  The IT group that manages the child domain is showing interest in wanting to set up their own SCCM 2012 hierarchy in the child domain.  Is this possible? Any links to documentation on how to set this up, special considerations for this approach, any configurations that are different than the normal SCCM install, etc... would be appreciated.  If it's not possible, I know we can use a CAS and just give them their own Primary site, but for the purpose of this question, I'm just interested in whether 2 hierarchies can co-exist(supported config) in the same forest, and whether there are any special considerations around setting this up.

Thanks in advance.
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Spyder2010
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Spyder2010
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merowingerCommented:
I don't know any documents about that.

It is possible and i've already build such an envionment but you've to make sure that you can exactly differ between both sites.

You need clear Boundaries which not overlap with the other site. E.g. Subnets, VLANs, etc.
If the Boundaries are correct you can even choose the AUTO Site Code Option when installing Clients, but i would prefer to use a direct Site Code.

It's very important that you're using unique Site Codes, so i would talk with the other guys before configuring a new one

Make sure AD- and Network Discoveries do not overlap or find other objects than the own.

The AD Schema must be extended only one time, so i think this is already done.
All Site Server must be able to write beneath the System Management Container in AD
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Spyder2010Author Commented:
Thank you for the response.  I'm aware of the AD schema changes(yes, they only need done once per forest), and the system management container permissions, unique site codes, boundaries/discovery, etc... I understand that you can have multiple sites within a hierarchy, spanning domains... what I need to know is if you can have two separate, unrelated hierarchies within a forest(i.e. The site in the root domain and the site in the child domain are both in their own independent hierarchies, and have nothing to do with one another)
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merowingerCommented:
i'm taking about two complete different SCCM hierarchies (including multiple SCCM Sites) within a single AD Forest (including multiple Domains)
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