What is the impact of upgrading the domain or forest functional level to 2012？

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what impact of upgrading forest or domain functional level 2012？
i'm seeking advice in order trust relationships (forest or domain) working fine.

my environment:dc×15(2008r2) in 1 forest includes 2 domains. forest & domain functional levels are both 2008. i'm going upgrade all domain controllers to 2012.

my trust relationships：
one-way external trust - incoming or outgoing - w/ aaa.ccc.local,ddd.eee.com...and more
two-way external trust - incoming or outgoing - w/ aaa.local,xxx.yyyy.com...and more
forest trust - incoming - qqq.www.com

any information appreciated!

dfl or ffl doesn't impact on trust relationships, operating system of dcs , if you're not having trusts windows nt 4.0 domains you're fine windows server 2012 r2 dcs if want.

the main impact of raising ffl , dfl windows server 2012 can't add down-level dcs (e.g. dcs running oses earlier windows server 2012).

windows server 2012 dfl adds support for:
kdc support claims, compound authentication, , kerberos armoring kdc administrative template policy has 2 settings (always provide claims , fail unarmored authentication requests) require windows server 2012 domain functional level. more information, see what's new in kerberos authentication.

for more information see:
http://technet.microsoft.com/en-us/library/understanding-active-directory-functional-levels(v=ws.10).aspx

enfo zipper
christoffer andersson – principal advisor
http://blogs.chrisse.se - directory services blog



Windows Server  >  Directory Services



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