[Samba] New sparsely connected replica graph (Improved KCC)

James lingpanda101 at gmail.com
Thu Sep 24 13:43:59 UTC 2015

On 9/18/2015 1:27 AM, Garming Sam wrote:
> Hi,
> First of all, thanks for at least giving it a go. I think there's a
> few points of confusion though. Bridge all site links is enabled by
> default and should be enabled, otherwise you would need to manually
> specify site-link bridges (which is not recommended by Microsoft and
> not implemented in the KCC currently).
> Is the new KCC running on all the DCs you mention?
> Denis Cardon had a go briefly and found that he needed to specify a
> bridgehead before any connections were made. We weren't able to
> confirm, but it's possible that specifying a bridgehead may help.
> http://samba.2283325.n4.nabble.com/More-KCC-patches-td4687011.html
> So now to your topology, you mentioned that those connections should
> not have been removed? Do you have any specific reasons why? If
> everything was functioning, there should be even more connections
> missing than you see right now. The general idea of using the topology
> is to make sure that a site contains only 1 in and 1 out link across
> all the DCs within that site (as well as additional links within a
> site). The fact that everything was connected before was the cause of
> bandwidth issues.
> The following would be similar to what I would actually expect:
>   Servers
>        SDC1
>           NTDS Settings   SDC2
>        SDC2
>           NTDS Settings   SDC1
>                           PDC1
> Default-First-Site-Name
>   Servers
>        PDC1
>           NTDS Settings   PDC2
>                           DDC1
>                           SDC1
>        PDC2
>           NTDS Settings   PDC1
>   Servers
>        DDC1
>           NTDS Settings   DDC2
>                           PDC1
>         DDC2
>           NTDS Settings   DDC1
> Probably one of the most annoying things about replication and testing
> replication is that it doesn't necessarily trigger immediately. It's
> definitely not something which is straightforward to test, or implement.
> Cheers,
> Garming
Small update. I attempted to enable the parameter and monitor
replication. I noticed no change from my prior testing(duplicate entries
and connections missing I expect to see). I did not enable a bridgehead
server. Next test I perform I will enable a bridgehead server.


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