Active Directory Cookbook

11.25. Finding the ISTG for a Site

Problem

You want to find the Inter-Site Topology Generator (ISTG) for a site.

Solution

Using a graphical user interface

1. Open the Active Directory Sites and Services snap-in.

2. Click on the site you are interested in.

3. In the right pane, double-click on the NTDS Site Settings object.

4. The ISTG will be displayed under Inter-Site Topology Generator if one is present.

Using a command-line interface

> repadmin /istg <DomainControllerName>

This command is available only with the Windows Server 2003 version of repadmin.

Using VBScript

' This code finds the ISTG for the specified site.
' ------ SCRIPT CONFIGURATION ------
strSiteName = <SiteName>  ' e.g. Raleigh
' ------ END CONFIGURATION ---------

set objRootDSE = GetObject("LDAP://RootDSE")
set objSiteSettings = GetObject("LDAP://cn=NTDS Site Settings,cn=" & _
                                strSiteName & ",cn=sites," & _
                                objRootDSE.Get("ConfigurationNamingContext"))
on error resume next
strISTGDN = objSiteSettings.Get("interSiteTopologyGenerator")
if (strISTGDN <> "") then
   set objNTDSSettings = GetObject("LDAP://" & strISTGDN)
   set objServer = GetObject( objNTDSSettings.Parent )
   WScript.Echo "ISTG for site " & strSiteName & " is " & _
                objServer.Get("dnsHostName")
else
   WScript.Echo "No ISTG found for site " & strSiteName
end if

Discussion

One domain controller in every site is picked as the ISTG for that site. While each domain controller is responsible for creating its own intra-site connection objects, the ISTG for a site is responsible for creating ...