6.1.4.2 msDS-Behavior-Version: DC Functional Level

The msDS-Behavior-Version attribute is written on the nTDSDSA object representing a DC. The value is the highest domain or forest functional level that the DC is capable of supporting. A DC supports any domain or forest functional level less than or equal to its msDS-Behavior-Version.

The value of the msDS-Behavior-Version attribute on an nTDSDSA object changes during an operating system upgrade of that DC. The value of the msDS-Behavior-Version attribute never decreases.

The absence of the msDS-Behavior-Version attribute on an nTDSDSA object is equivalent to the msDS-Behavior-Version attribute on that object having the value zero.

The following values are defined.

Identifier	Applicable domain controller operating system	Value
DS_BEHAVIOR_WIN2000 *	Windows 2000 Server operating system	0
DS_BEHAVIOR_WIN2003	Windows Server 2003 operating system, Windows Server 2003 R2 operating system	2
DS_BEHAVIOR_WIN2008	Windows Server 2008 operating system	3
DS_BEHAVIOR_WIN2008R2	Windows Server 2008 R2 operating system	4
DS_BEHAVIOR_WIN2012	Windows Server 2012 operating system	5
DS_BEHAVIOR_WIN2012R2	Windows Server 2012 R2 operating system	6
DS_BEHAVIOR_WIN2016	Windows Server 2016 operating system Windows Server v1709 operating system Windows Server v1803 operating system Windows Server v1809 operating system Windows Server 2019 operating system	7

* Not available in AD LDS.