Migrate to new domain and new SCCM

Question

The migration scenario is this:
All Clients are in Domain1 and are managed through SCCM 2012 with System Center Endpoint Protection 2012.
Some of the clients need to join a new domain and be managed through a new SCCM 2012 R2 server with System Center Endpoint Protection 2012 R2.
There are no trusts between the forests. Do we need to uninstall the SCCM 2012 Agent and SCEP 2012 and then install the new SCCM 2012 R2 Agent and SCEP 2012 R2?
Or can we just uninstall SCCM 2012 Agent only and keep SCEP 2012 and later install.

Answer 1

There are multiple ways to go about it.
Assuming that the AD forest is properly extended and the new site's info is properly published, then you can simply run a script:
http://msdn.microsoft.com/en-us/library/cc146558.aspx
http://gallery.technet.microsoft.com/scriptcenter/Change-sccm-configmgr-cf6e0327/view/Discussions
If the two assumptions above aren't correct, then the client has no way of getting the trusted root key gracefully for the new site and running ccmsetup  is the best way.
The ccmsetup bootstrapper will download files as needed from the closest DP but (from memory) won't redownload files if they are already present in the ccmsetup folder.
A client push is probably the easiest method to initiate ccmsetup because it can be managed from a central location -- just make sure you select the checkbox for always reinstall. Of course, as mentioned above, if someone has previously used the "group
policy" to assign the site to your clients, you'll need to clean up that mess first otherwise the clients will always try to assign to the old site.
Jason | http://blog.configmgrftw.com