My private collection of articles found on the net, i dont own them but they helped me.: Setting GC Global Catalog through powershell

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   Specializing in Office Communications Server, Exchange, Active Directory ,TMG 2010, ISA 2006,System Center Operations Manager and Powershell

Setting GC Global Catalog through powershell

Script to set Global Catalog role when not GC's are available


# ---------------------------------------------------------------------------------------------------
function set-GCrole
# ---------------------------------------------------------------------------------------------------
{
Param (
  $serverName,
  $IsGC = "enable"
  )
  $dse  = [adsi]("LDAP://"+$Servername+"/RootDSE")
  $ntds  = [adsi]("LDAP://"+$dse.dsServiceName)
  
  # 1 = enable, 0 or nothing = disable
  If ($IsGC -eq "disable")
  {
    $ntds.options = 0
  }
  else
  {
    $ntds.options = 1
  }
  $ntds.SetInfo()
}
 
# ---------------------------------------------------------------------------------------------------
If ($Args.count -ne 2)
{
  write-host "You need to provide the Name of the DC,"
  write-host "and the ""enable"" or ""disable"" keyword."
  write-host "example: Set-GCrole.ps1 ""server1"" ""enable"""
  write-host
  exit
}
Set-GCrole $Args[0] $args[1]