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Dean
Asked: 2012-03-18 09:01:41 +0800 CST

Windows Server 2003: Replication between DC's takes place only after changes are made?

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I just finished the 70-294 Kit, and I am left with a huge knownegde gap:

The instructor says that replication taked place 15 seconds after a change is made, and 3 seconds addition for any additional DC.

Likewise, some changes trigger urgent replication between sites (security related).

OK, that makes sence.

Then why, in AD Sites and Services, do the Intersite link objects have an attribute of Replication Schedule? Is there another replication that takes place regardless of changes?

windows-server-2003 replication active-directory

2 Answers

  1. Best Answer

    There are two different types of replication that take place:

    • Intrasite replication
    • Intersite replication

    Intrasite replication is the replication that takes place between DC's in the same site. Intersite replication is the replication that takes place between DC's in different sites (i.e. over WAN links). If you are referring to the "Change Schedule" button under the link objects properties.....

    From Microsoft:

    Although intrasite replication occurs automatically when an update occurs, replication partners are also contacted once every hour to ensure that changes that might have been missed are replicated.

    Reference:

    NTDS Site Settings Properties Sheet - Site Settings Tab

    http://technet.microsoft.com/en-us/library/dd145473.aspx

    Understanding Sites and Replication

    http://technet.microsoft.com/en-us/library/cc757232(v=ws.10).aspx

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  2. The 15 second replication occurs for Intrasite replication. Intrasite replication occurs between DCs within the same defined site (same logical subnet) in AD Sites and Services. The replication schedule you are referring to allows you to specify the availability of site link. The site link defines replication between DCs in different sites is called Intersite replication. Additionally there is a site link replication frequency defined in 15 minute increments. So, you could set the Intersite replication to occur every 15 minutes (frequency) all day, everyday. Or, you could say replicate every 30 minutes every Monday thru Friday between 6am and 8pm.

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