This function performs the configuration change described by the article "Active Directory Replication: Change Notification & You" by Chad Duffey (see: https://blogs.msdn.microsoft.com/canberrapfe/2012/03/25/active-directory-replication-change-notification-you/)

Enable-ADReplicationChangeNotification.ps1

#requires -Modules ActiveDirectory

<#
.SYNOPSIS
 Enables Change Notification on IP AD Replication Site Links

.PARAMETER SiteLink
 The DistinguishedName of the SiteLink to modify.
 
.PARAMETER Domain
 The Domain to operate on. Defaults to the current user's domain.
 
.PARAMETER Credential
 The credential to use when performing the operation, if needed.
 
.PARAMETER Force
 Force the operation to be performed even if the script detects that change
 notification is already enabled.
 
.EXAMPLE
 Get-ADReplicationSiteLink -Filter * | Enable-ADReplicationChangeNotification.ps1 -Verbose

.NOTES
 This function performs the configuration change described by the article
 "Active Directory Replication: Change Notification & You" by Chad Duffey
 
 https://blogs.msdn.microsoft.com/canberrapfe/2012/03/25/active-directory-replication-change-notification-you/

#>
[CmdletBinding(SupportsShouldProcess)]
param(

    [Parameter(Mandatory, ValueFromPipeline, Position=1)]
    [string[]]
    $SiteLink,

    [string]
    $Domain = $env:USERDOMAIN,

    [pscredential]
    $Credential,

    [switch]
    $Force

)

begin {

    $CredentialSplat = @{}
    if ( $Credential ) { $CredentialSplat.Credential = $Credential }

    $ADDomainController = Get-ADDomainController -DomainName $Domain -Discover -Service ADWS

}

process {

    foreach ( $SiteLinkItem in $SiteLink ) {

        $ADReplicationSiteLinkItem = Get-ADReplicationSiteLink $SiteLinkItem -Properties options -Server $ADDomainController.HostName[0] -ErrorAction Stop

        Write-Verbose ( 'Found AD site link {0} with options value {1}' -f $ADReplicationSiteLinkItem.Name, [int]$ADReplicationSiteLinkItem.options )


        if ( -not $Force -and [int]$ADReplicationSiteLinkItem.options -band 1 ) {

            Write-Warning ( 'Change Notification Already Enabled for {0}' -f $ADReplicationSiteLinkItem.Name )
            continue

        }

        [int]$NewOptions = $ADReplicationSiteLinkItem.options -bor 1

        if ( $PSCmdlet.ShouldProcess($ADReplicationSiteLinkItem.DistinguishedName, 'enable change notification') ) {

            Set-ADReplicationSiteLink -Identity $ADReplicationSiteLinkItem.DistinguishedName -Replace @{options=$NewOptions} -Server $ADDomainController.HostName[0] @CredentialSplat

        }

    }

}