nltest /dsgetdc: /force

http://technet.microsoft.com/en-us/library/ee624051(WS.10).aspx

nltest /dsgetdc: /force

           DC: \\DC1.corp.contoso.com
      Address: \\2002:836b:2:1:0:5efe:10.0.0.1
     Dom Guid: e8bae90e-02c4-4489-8abd-e63353fed05a
     Dom Name: corp.contoso.com
  Forest Name: corp.contoso.com
 Dc Site Name: Default-First-Site-Name
        Flags: PDC GC DS LDAP KDC TIMESERV GTIMESERV WRITABLE DNS_DC DNS_DOMAIN
DNS_FOREST FULL_SECRET WS
The command completed successfully