Configuring a Replication Schedule for a Connection Object

To configure the replication schedule for a specific connection object, follow these steps:

1. Using Active Directory Sites and Services, locate the site container that has the server you wish to work with. (Connection objects belong to servers.)

2. Expand the server container, and then click the NTDS Settings object.

3. In the right-hand pane, right-click the connection you wish to configure, and select Properties. In the From Server column, you can see the name of the replication partner for each connection. The Connection Properties window will appear, as shown in Figure 6-15.

4. On the General tab, click the Change Schedule button. Using the settings from Table 6-2, configure your replication schedule as applicable, and click OK.

5. On the General tab, click OK to apply the new settings.

FIGURE 6-15

Connection object properties

2008 Inter Site Transports Object Tab

Automatically generated connection objects are created and maintained by KCC for intra-site replication, linking servers within the same site. Automatically generated connections are maintained by KCC, and should you choose to proceed with manual configuration, the object will fall out of the scope of KCC's management. The general idea behind this is that if you have to adjust the default behavior of an automatically generated object, perhaps there is a business or technical requirement that is not met by the default algorithms implemented with KCC; so it will stop managing this object. Keep in mind that every time your topology changes (a new server is added, or an existing server is taken offline), you will need to review what impact this has on your static intra-site replication objects. Therefore it is not recommended to manage intra-site replication manually.

Automatically generated connection objects inherit schedule settings from the parent object's NTDS template. You can adjust parent NTDS settings to enforce your own replication schedule, while allowing KCC to continue managing automatic connection objects. Intra-site and inter-site connection objects inherit connection object replication schedule settings from different parent objects.

Intra-site connection objects inherit replication schedules from the NTDS Settings object in each site. The process of assigning a custom replication schedule is largely the same for the NTDS Settings object as it is for individual connection objects, except you are modifying properties of a different object. After you modify NTDS settings, KCC will update the automatically generated connection objects during its next run, which happens at least once every 15 minutes. If necessary, you can force this process to happen immediately. First, you need to replicate your modified NTDS settings from the domain controller you are working on to other domain controllers. (Recall from previous chapters that this replication is performed every 15 seconds and results in changes propagating to all domain controllers within the same site in no more than 45 seconds.) If you have to trigger this part of the process manually, you can use the Replicate Now option in the connection object's context menu. This step is necessary to make sure that KCC uses updated NTDS settings when recalculating the topology.

Optionally, before triggering replication manually, you may want to check the replication topology by launching the KCC process. To do this, use the NTDS Settings context menu in the server container you are working with, click All Tasks, and then click Check Replication Topology. Figure 6-16 demonstrates this step. Going through this procedure does not guarantee immediate visible changes to the existing configuration; it may take a few minutes before all changes are calculated, committed, and replicated to all other domain controllers.

FIGURE 6-16

Triggering KCC topology calculation manually

FIGURE 6-16

Triggering KCC topology calculation manually

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Getting back to inter-site connection objects (which have names and can be found on bridgehead servers): they inherit replication schedules from SiteLink objects, defined in the Inter-Site Transports container. (Figure 6-17 illustrates the property page of a SiteLink object.) Administrators can use SiteLink objects to set replication schedules (by clicking the Change Schedule button) and replication intervals (using the Replicate Every setting). Replication schedules, similar to NTDS settings, define times of the day and week when the replication window is open. Replication intervals, however, define how often replication can occur after the replication window opens. This is different from intra-site replication, which is triggered by changes committed to domain controller databases. Inter-site replication is triggered by interval settings. (To be technically correct, the replication interval controls replication frequency within the allowed replication window, but in practical terms, these statements mean the same thing.) In both cases, schedules determine the time of day and week when replication can take place.

FIGURE 6-17

Site link object properties

Intersite Replication 180 Minutes

The inter-site replication interval is configured to 180 minutes by default, and it must be a multiple of 15. Replication across a site link will be triggered every N minutes (where N is replication interval) during the time windows permitted by the replication schedule. The following figure helps visualize this. Figure 6-18 shows replication runs for two configurations: one with a 30-minute replication interval, another with a 45-minute replication interval. Both configurations are set with a "replicate always" replication schedule, allowing replication to occur around the clock.

When your replication interval is not 15, 30, or 60 minutes, the replication schedule inherited by connection objects (viewable in connection object properties) does not let you see the big picture. Some of the replication windows allowed by the schedule may be omitted due to longer intervals.

FIGURE 6-18

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FIGURE 6-18

Replication interval and replication schedule for inter-site replication

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Responses

  • gianfranco
    How configure connection object in windows 2008?
    9 years ago
  • estella
    How to change ntds automatic link replication schedule?
    7 years ago
  • olli lindberg
    Which schedule has presidence KCC or intersite link?
    7 years ago
  • will
    How to configure a replication schdule in active directory?
    2 years ago
  • Girma
    How to configure ntds schedule?
    1 year ago
  • KANE
    Where is the Active Directory Replication Interval defined?
    8 months ago
  • frediano
    How to change connection object from manual to automatic in dssite?
    1 month ago

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