MS-AD-BIS - the preferred schema for most Windows 2012 and later AD servers AD-IDMU - Windows 2008, Windows 2012 and later AD servers AD-SFU - Windows 2003 and earlier AD servers RFC-2307 - UNIX LDAP ...MS-AD-BIS - the preferred schema for most Windows 2012 and later AD servers AD-IDMU - Windows 2008, Windows 2012 and later AD servers AD-SFU - Windows 2003 and earlier AD servers RFC-2307 - UNIX LDAP servers These default schemas works with most LDAP servers If needed you can create your own schema for a specific need, though this is not recommended AD based schemas are based on the functionality level of the domain. How to Configure LDAP in ONTAP - NetApp TR-4835