Microsoft KB Archive/271988

= Replication Topology Updates =

PSS ID Number: 271988

Article Last Modified on 11/18/2003

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The information in this article applies to:


 * Microsoft Windows 2000 Server
 * Microsoft Windows 2000 Advanced Server
 * Microsoft Windows 2000 Datacenter Server

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This article was previously published under Q271988



IMPORTANT: This article contains information about modifying the registry. Before you modify the registry, make sure to back it up and make sure that you understand how to restore the registry if a problem occurs. For information about how to back up, restore, and edit the registry, click the following article number to view the article in the Microsoft Knowledge Base:

256986 Description of the Microsoft Windows Registry



SUMMARY
By default, the Knowledge Consistency Checker (KCC) runs its first replication topology check five minutes after the service starts.



MORE INFORMATION
WARNING: If you use Registry Editor incorrectly, you may cause serious problems that may require you to reinstall your operating system. Microsoft cannot guarantee that you can solve problems that result from using Registry Editor incorrectly. Use Registry Editor at your own risk.

Administrators can change this behavior by modifying the following registry value:

Key: HKLM\System\CurrentControlSet\Services\NTDS\Parameters

Value Name: Repl topology update delay (secs)

Value Type: REG_DWORD

Value Data: number of seconds to wait

Default: 300 (5 minutes)

As long as services are running, the KCC checks the topology every 15 minutes by default, and makes changes to the topology as necessary. The administrator can modify the interval at which the KCC does this review by changing the following registry value:

Key: HKLM\System\CurrentControlSet\Services\NTDS\Parameters

Value Name: Repl topology update period (secs)

Value Type: REG_DWORD

Value Data: number of seconds between intervals

Default: 900 (15 minutes)

The administrator can also force the KCC into reviewing the topology by performing the following steps:
 * 1) Open the Active Directory Sites and Services Microsoft Management Console (MMC) snap-in from the Administrative Tools menu, or by typing dssite.msc in the Run command on the Start menu.
 * 2) Expand the Sites node in the left pane to expose each of the sites defined in the forest.
 * 3) Beneath the site where the server resides, expand the Servers node. This will display a list of the servers in the site.
 * 4) Expand the server, right-click the NTDS Settings object, point to All Tasks, and then click Check Replication Topology. Regardless of which computer has the focus in the Active Directory Sites and Services tool, a remote procedure call (RPC) will be remoted to the selected computer to initiate a KCC cycle.

Upon successful completion, the administrator receives a dialog box that states:

The Active Directory has checked the replication topology.

If the situation requires that all computers evaluate the topology sooner than the next interval, the administrator will need to repeat this process for other servers in the site.

For additional information about inter-site topology, click the article number below to view the article in the Microsoft Knowledge Base:

224815 The Role of the Inter-Site Topology Generator

Keywords: kbActiveDirectoryRepl kbinfo KB271988

Technology: kbwin2000AdvServ kbwin2000AdvServSearch kbwin2000DataServ kbwin2000DataServSearch kbwin2000Search kbwin2000Serv kbwin2000ServSearch kbWinAdvServSearch kbWinDataServSearch

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