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Understanding AD Sites Links and Bridges RRS feed

  • Question

  • If I have four sites (A, B, C, & D) within the same domain and have three site links, one between sites A and B, one between sites B and C, and one between sites C and D, with the bridge all site links option turned off because of a remote firewall connection, if I make a change to an object on the DC in site A would it not replicate change to site B which would then replicate the change to site C and so forth or does the object in site B get updated but not to site C unless a site bridge is created for site links AB and BC? Wouldn't site B compare its records with site C and replicate the changes without the site bridge?  Does this method change if Sites A and B are in one domain and sites C and D are in another domain in the same forest?

    A - SiteLink -B -SiteLink - C - SiteLink -Firewall - D

     

    Also, what would be the difference between creating a single site link including sites A, B, and C and creating two site links A to B and B to C with a site bridge containing the two site links?

    Thursday, January 13, 2011 2:57 AM

Answers

  • Hi,

     

    If there are three site links, Site Link AB, BC and CD, then Site Link CD is blocked by firewall connection, then the replication only occurs in the Sits A, B and C. In addition, only the schema will be replicated cross-domain in the same forest, no replication occurs between domains.

     

    Create a site link design to connect your sites with site links. A site link bridge connects two or more site links and enables transitivity between site links. If your Site Links AB and BC cannot transmit, then an object updates in Site A, it only can replicate to Site B and will not be replicated to Site C. If so, you can create Site Link Bridge ABC to make sure replication occurs among Sites A, B and C.

     

    For more information, please refer to the following Microsoft TechNet articles:

     

    Designing the Site Topology

    http://technet.microsoft.com/en-us/library/cc787284(WS.10).aspx

     

    Managing Replication Between Sites

    http://technet.microsoft.com/en-us/library/cc961783.aspx

     

    Regards,

     

    Arthur Li

    TechNet Subscriber Support in forum

    If you have any feedback on our support, please contact tngfb@microsoft.com.


    Please remember to click “Mark as Answer” on the post that helps you, and to click “Unmark as Answer” if a marked post does not actually answer your question. This can be beneficial to other community members reading the thread.
    • Proposed as answer by Mike Kline Saturday, January 15, 2011 3:38 PM
    • Marked as answer by Joe User12345 Sunday, January 16, 2011 12:22 AM
    Friday, January 14, 2011 5:22 AM
  • One possible scenario involves three sites which are connected via a MPLS cloud - where you don't have any specific preferences regarding the replication topology.

    hth
    Marcin

    • Proposed as answer by Mike Kline Saturday, January 15, 2011 3:39 PM
    • Marked as answer by Joe User12345 Sunday, January 16, 2011 12:22 AM
    Saturday, January 15, 2011 12:44 AM
  • As said earlier, site links are used to connect one or more site links which is segregated by subnet  or ISP. You can also control replication schedule & cost(lower the cost higher the priority), When you want two sites to get the update from the single site instead from other site links.

    http://technet.microsoft.com/es-es/library/cc755994%28WS.10%29.aspx

     


    Awinish Vishwakarma | TA - DS/Exchange
    • Marked as answer by Joe User12345 Sunday, January 16, 2011 12:24 AM
    Saturday, January 15, 2011 9:07 AM

All replies

  • Hi,

     

    If there are three site links, Site Link AB, BC and CD, then Site Link CD is blocked by firewall connection, then the replication only occurs in the Sits A, B and C. In addition, only the schema will be replicated cross-domain in the same forest, no replication occurs between domains.

     

    Create a site link design to connect your sites with site links. A site link bridge connects two or more site links and enables transitivity between site links. If your Site Links AB and BC cannot transmit, then an object updates in Site A, it only can replicate to Site B and will not be replicated to Site C. If so, you can create Site Link Bridge ABC to make sure replication occurs among Sites A, B and C.

     

    For more information, please refer to the following Microsoft TechNet articles:

     

    Designing the Site Topology

    http://technet.microsoft.com/en-us/library/cc787284(WS.10).aspx

     

    Managing Replication Between Sites

    http://technet.microsoft.com/en-us/library/cc961783.aspx

     

    Regards,

     

    Arthur Li

    TechNet Subscriber Support in forum

    If you have any feedback on our support, please contact tngfb@microsoft.com.


    Please remember to click “Mark as Answer” on the post that helps you, and to click “Unmark as Answer” if a marked post does not actually answer your question. This can be beneficial to other community members reading the thread.
    • Proposed as answer by Mike Kline Saturday, January 15, 2011 3:38 PM
    • Marked as answer by Joe User12345 Sunday, January 16, 2011 12:22 AM
    Friday, January 14, 2011 5:22 AM
  • Thank you, the links were very helpful. When would one choose to add more than two sites to a single site link?
    Saturday, January 15, 2011 12:32 AM
  • One possible scenario involves three sites which are connected via a MPLS cloud - where you don't have any specific preferences regarding the replication topology.

    hth
    Marcin

    • Proposed as answer by Mike Kline Saturday, January 15, 2011 3:39 PM
    • Marked as answer by Joe User12345 Sunday, January 16, 2011 12:22 AM
    Saturday, January 15, 2011 12:44 AM
  • As said earlier, site links are used to connect one or more site links which is segregated by subnet  or ISP. You can also control replication schedule & cost(lower the cost higher the priority), When you want two sites to get the update from the single site instead from other site links.

    http://technet.microsoft.com/es-es/library/cc755994%28WS.10%29.aspx

     


    Awinish Vishwakarma | TA - DS/Exchange
    • Marked as answer by Joe User12345 Sunday, January 16, 2011 12:24 AM
    Saturday, January 15, 2011 9:07 AM