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Set-ADForestMode

Karthik S
powershell

Set-ADForestMode is accessible with the help of addsadministration module. To install addsadministration on your system please refer to this link.

Synopsis

Sets the forest mode for an Active Directory forest.

Description

The Set-ADForestMode cmdlet sets the Forest mode for an Active Directory forest. You specify the forest mode by setting the ForestMode parameter. The forest mode can be set to the following values that are listed in order of functionality from lowest to highest.

Windows2000Forest
Windows2003InterimForest
Windows2003Forest
Windows2008Forest
Windows2008R2Forest

The Identity parameter 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. You can also specify the forest by passing a forest object through the pipeline. For example, you can use the Get-ADForest cmdlet to retrieve a forest object and then pass the object through the pipeline to the Set-ADForestMode.

Set-ADForestMode will prompt for confirmation by default.

Parameters 

-AuthType 
         Specifies the authentication method to use. Possible values for this parameter include:

    Required?                    false
    Position?                    named
    Default value                Microsoft.ActiveDirectory.Management.AuthType.Negotiate
    Accept pipeline input?       false
    Accept wildcard characters?  false

-Credential <PSCredential>
    Specifies the user account credentials to use to perform this task. The default credentials are the credentials of the currently logged on user unless the cmdlet is run from an Active Directory PowerShell provider drive. If the cmdlet is run from such a provider drive, the account associated with the drive is the default.

    Required?                    false
    Position?                    named
    Default value                
    Accept pipeline input?       false
    Accept wildcard characters?  false

-ForestMode <ADForestMode>
    Specifies the forest mode for an Active Directory forest. The possible values for this parameter are:   Windows2000Forest or 0

    Required?                    true
    Position?                    3
    Default value                
    Accept pipeline input?       false
    Accept wildcard characters?  false

-Identity <ADForest>
    Specifies an Active Directory forest object by providing one of the following attribute values. The identifier in parentheses is the LDAP display name for the attribute.

    Required?                    true
    Position?                    1
    Default value                
    Accept pipeline input?       True (ByValue)
    Accept wildcard characters?  false

-PassThru <SwitchParameter>
    Returns the new or modified object. By default (i.e. if -PassThru is not specified), this cmdlet does not generate any output.

    Required?                    false
    Position?                    named
    Default value                
    Accept pipeline input?       false
    Accept wildcard characters?  false

-Server <String>
    Specifies the Active Directory Domain Services instance to connect to, by providing one of the following values for a corresponding domain name or directory server. The service may be any of the following:  Active Directory Lightweight Domain Services, Active Directory Domain Services or Active Directory Snapshot instance.

    Required?                    false
    Position?                    named
    Default value                
    Accept pipeline input?       false
    Accept wildcard characters?  false

-Confirm <SwitchParameter>
    Prompts you for confirmation before running the cmdlet.

    Required?                    false
    Position?                    named
    Default value                false
    Accept pipeline input?       false
    Accept wildcard characters?  false

-WhatIf <SwitchParameter>
    Shows what would happen if the cmdlet runs. The cmdlet is not run.

    Required?                    false
    Position?                    named
    Default value                false
    Accept pipeline input?       false
    Accept wildcard characters?  false

Syntax

Set-ADForestMode [-WhatIf] [-Confirm] [-AuthType <ADAuthType>] [-Credential <PSCredential>] [-ForestMode] <ADForestMode> [-Identity] <ADForest> [-PassThru] [-Server <String>] [<CommonParameters>]

Notes
This cmdlet does not work with AD LDS.

————————– EXAMPLE 1 ————————–
C:\PS>Set-ADForestMode -Identity TOSSolution.com -ForestMode Windows2003Forest
Set the ForestMode to Windows2003Forest in the forest TOSSolution.com.

————————– EXAMPLE 2 ————————–
C:\PS>$currentForest = Get-ADForest
Set-ADForestMode -Identity $currentForest -Server $currentForest.SchemaMaster -ForestMode Windows2008R2Forest
Set the forest mode of the current logged on user’s forest. The Set operation targets the Schema Master FSMO to apply the update.

You can check the Version, CommandType and Source of this cmdlet by giving below command.

Get-Command Set-ADForestMode

You can also read about
. Get-ADForest

To know more PowerShell cmdlets(Commands) on addsadministration (Active Directory) click here

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References are taken from Microsoft

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