ADForestFunctionalLevel

ADForestFunctionalLevel

Parameters

Parameter	Attribute	DataType	Description	Allowed Values
ForestIdentity	Key	String	Specifies the Active Directory forest to modify. You can identify a forest by its fully qualified domain name (FQDN), GUID, DNS host name, or NetBIOS name.
ForestMode	Required	String	Specifies the the functional level for the Active Directory forest.	Windows2008R2Forest, Windows2012Forest, Windows2012R2Forest, Windows2016Forest

Description

This resource changes the forest functional level. For further details, see Forest and Domain Functional Levels.

WARNING: This action might be irreversible! Make sure you understand the consequences by changing a functional level.

Read more about raising function levels and potential roll back scenarios in the Active Directory documentation, for example: Upgrade Domain Controllers to Windows Server 2016.

Requirements

• Target machine must be running Windows Server 2008 R2 or later.
• Target machine must be running the minimum required operating system version for the forest functional level to set.

Examples

Example 1

This configuration will change the forest functional level to a Windows Server 2012 R2 Forest.

Configuration ADForestFunctionalLevel_SetLevel_Config
{
    Import-DscResource -ModuleName ActiveDirectoryDsc

    node localhost
    {
        ADForestFunctionalLevel 'ChangeForestFunctionalLevel'
        {
            ForestIdentity = 'contoso.com'
            ForestMode     = 'Windows2012R2Forest'
        }
    }
}