Enabling Notify-driven Replication Across Active Directory Sites

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How to Enable Notify-Driven Replication Across Active Directory Sites

Active Directory (AD) is a directory service that stores information about objects on a network and makes this information available to users and administrators. AD uses replication to synchronize the data in the directory across multiple domain controllers (DCs) that are located in different physical locations or sites.

By default, AD uses a pull-based replication model, where a DC periodically polls its replication partners for any changes that need to be replicated. This model ensures that all DCs eventually receive the updates, but it also introduces some latency and overhead in the replication process.

A more efficient and responsive replication model is notify-driven replication, where a DC notifies its replication partners of any changes that need to be replicated as soon as they occur. This model reduces the latency and overhead in the replication process, and allows the changes to propagate faster across the network.

However, notify-driven replication is not enabled by default across different sites, because it requires a reliable and fast network connection between the DCs. If the network connection is slow or unreliable, notify-driven replication may cause excessive network traffic and replication failures.

Therefore, before enabling notify-driven replication across different sites, you should evaluate your network infrastructure and ensure that it can support this replication model. You should also monitor the replication performance and health after enabling notify-driven replication, and troubleshoot any issues that may arise.

In this article, we will show you how to enable notify-driven replication across different sites using the Active Directory Sites and Services snap-in or the Repadmin command-line tool.

Using the Active Directory Sites and Services snap-in

The Active Directory Sites and Services snap-in is a graphical user interface (GUI) tool that allows you to manage the configuration and topology of AD replication. You can use this tool to enable notify-driven replication across different sites by following these steps:

Open the Active Directory Sites and Services snap-in by clicking Start, typing dssite.msc in the search box, and pressing Enter.

In the left pane, expand the Sites container and select the site that contains the source DC that you want to enable notify-driven replication for.

In the right pane, double-click the NTDS Settings object under the source DC.

In the NTDS Settings Properties dialog box, click the Connections tab.

Select the connection object that represents the replication partner in another site that you want to enable notify-driven replication with, and click Properties.

In the Connection Properties dialog box, check the Enable this connection to use notification option, and click OK.

Repeat steps 5 and 6 for any other connection objects that you want to enable notify-driven replication with.

Click OK to close the NTDS Settings Properties dialog box.

Note: You can also enable notify-driven replication for all connection objects in a site by selecting the NTDS Settings object under the source DC, clicking Change Schedule in the right pane, checking the Use notification always option, and clicking OK.

Using the Repadmin command-line tool

The Repadmin command-line tool is a command-line interface (CLI) tool that allows you to diagnose and manage AD replication. You can use this tool to enable notify-driven replication across different sites by following these steps:

Open a command prompt window by clicking Start, typing cmd in the search box, and pressing Enter.

Type the following command and press Enter:

repadmin /options -DISABLE_INBOUND_REPL

This command disables inbound pull-based replication for the source DC.

Type the following command and press Enter:

repadmin /options +CHANGE_NOTIFICATION

This command enables outbound notify-driven replication for the source DC.

Type the following command and press Enter:

repadmin /options -DISABLE_OUTBOUND_REPL

This command disables outbound pull-based replication for the destination DC.

Type the following command and press Enter:

repadmin /options +CHANGE_NOTIFICATION

This command enables inbound notify-driven replication for the destination DC.

Repeat steps 2 to 5 for any other DC pairs that you want to enable notify-driven replication between.

Note: You can also enable notify-driven replication for all DCs in a site by using an asterisk (*) instead aa16f39245