New 2012 DC in 2008 forest/domain. Netlogon/Sysvol DFS referrals show only 2012 DC.

I'm in the midst of testing a 2008 to 2012 domain upgrade.  I have segmented an existing 2008 DC into a sandbox network, as well as a new 2012 R2 member server.  I have added run the necessary ADpreps, and promoted the new 2012 DC into place and all seemingly is working perfectly.

One thing caught my eye though.  On the 2008 DC, if I navigate to \\mydomain\netlogon, and check the DFS tab in Windows Explorer, I show the referral list has all DCs in it, including the new 2012 DC.  But on the 2012 DC, if I do the same check, this referral list only shows the 2012 DC.  None of my 2008 DCs are listed at all.

I have verified by running DFSUtil Cache Referral command and it shows the same results.  This occurs for both the Netlogon and Sysvol shares.

Is this normal for a 2012 DC sitting in a 2008 domain or do I have something I need to address before moving forward with an actual domain upgrade?
mcdonamwIONAsked:
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Will SzymkowskiSenior Solution ArchitectCommented:
What you are seeing is by design. In 2008R2 it creates a randomized list of referrals based on the active directory site. In 2012 it only references itself so that it does not refer to another DC. This is done due to performance enhancements.

I have also tested your theory in my lab and I got the same results as you did. I have also checked the Microsoft forums and there is also a question similar to yours and it is same result as well.

DFS referral 2012

Rest assured this is the correct outcome with 2012 DC's with DFS referral's.

Will.
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mcdonamwIONAuthor Commented:
Thanks Will.  Is there any official MS documentation to cite this functionality?  I can't find anything.  

Note:  I never thought to try it, but I checked my referral list on my Windows 8.1 workstation (against my existing 2008 domain), and I show Sysvol and Netlogon only list a single entry for one DC as well.  I guess Netlogon/Sysvol are special and do not show multiple referrals like other actual DFS namespaces (which are actually showing multiple referrals).

At any rate, thanks for answering my question!
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