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AD Sites & Services - KCC Generates Incorrect Topology RRS feed

  • Question

  • I have 3 sites A, B, and C.  The subnets are configured correctly on each site.

    Site A is headquarters.  Site B and C are branch offices, and IP traffic is not routable between them.  Each of them is only routable to Site A.

    All sites are members of DEFAULTIPSITELINK which has a cost of 200.  I have also created two Site Links (A-B and A-C), each with a cost of 100.

    KCC is incorrectly telling Site B to replicate from Site C, and isn't telling it to replicate to anywhere (seen when I right-click on the NTDS Settings object and go to Properties>Connections).  What's the problem here?


    • Edited by J-LA Thursday, June 18, 2015 5:02 PM
    Thursday, June 18, 2015 5:01 PM

Answers

All replies

  • Hi J-LA,

    Thanks for your post.

    The KCC creates replication connections based on your site topol

    ogy, which you must define by creating sites and site links. In your scenario, you could delete manual bridgehead selections in each site. Runrepadmin /kcc on each DC to automatically regenerate a new topology. After running the command, then run repadmin /showrepl to  have a check.

    In addition, you could check the error message in the Event log.

    Best Regards,

    Mary Dong

    Friday, June 19, 2015 4:53 AM
    Moderator
  • Thanks!  This does not solve the issue, though.  KCC just regenerates the same incorrect topology.  The File Replication Service log is not much help because it is filled with errors because it's trying to replicate to a DC that it cannot even ping.

    Wednesday, July 1, 2015 8:07 PM
  • Hi J-LA,

    Could you please show more error message about replication failure in the log? And Is the problem only between site B and site C? Please also use Dcdiag.exe to verify domain controller health.

    Best Regards,

    Mary Dong

    Thursday, July 2, 2015 2:17 AM
    Moderator
  • Hello,

    Can you provide the output of following command and possible Error screenshot if you can share here.

    Please upload the output of this command to common share location onedrive etc.

    Repadmin /Replsum /errorsonly

    repadmin /showrepl*

    dcdiag /v /c /d /e /s:Contoso.com

    repadmin /kcc on each DC

    Thursday, July 2, 2015 4:44 AM
  • Also

    The KCC is will automatically creates the partnerships. The KCC doesn't know if you have a physical mesh or not. If BASL is enabled, which it is by default, it will create partnerships all over the place between DCS in any sites. If the physical network is not meshed, then the KCC will be partnering DCS that can't physically communicate to each other.

    Thursday, July 2, 2015 5:01 AM
  • Hi,

    Hope your query is resolved?

    Sunday, July 5, 2015 12:09 PM