You want to find the Inter-Site Topology Generator (ISTG) for a site.
Open the Active Directory Sites and Services snap-in.
Click on the site you are interested in.
In the right pane, double-click on the NTDS Site Settings object.
The ISTG will be displayed under Inter-Site Topology Generator if one is present.
> repadmin /istg <DomainControllerName>
This command is available only with the Windows Server 2003 version of repadmin.
' 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
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 the inter-site connection objects for the bridgehead servers in the site.
The current ISTG for a site is stored in the interSiteTopologyGenerator attribute of the site's NTDS Site Settings object. The distinguished name of ISTG's NTDS Settings object is stored in the interSiteTopologyGenerator attribute.
Disabling inter-site topology generation is synonymous with disabling the KCC for a site. See Recipe 11.29 for more information on disabling the KCC.
Recipe 11.26 for moving the ISTG, MS KB 224815 (The Role of the Inter-Site Topology Generator in Active Directory Replication), and MS KB 224599 (Determining the Inter-Site Topology Generator (ISTG) of a Site in the Active Directory)