Re: AD Sites Question
From: Hooch (sfsmailtest_at_yahoo.co.uk)
Date: 11/17/04
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Date: 17 Nov 2004 01:52:51 -0800
Thanks for your input guys, much appreciated. One follow up question
if I may. Given that we can assume the current setup is OK, and we are
not concerned about setting different replication intervals (or indeed
costs) between the different sites, is there any compelling reason to
move away from having the one site link setup? Originally I created a
number of individual site links (e.g. site a link to site b, site a
link to site c etc), but then changed this to just the one site link
containing all sites.
Many thanks,
Ben
"ptwilliams" <ptw2001@hotmail.com> wrote in message news:<#XNHtJCzEHA.3708@TK2MSFTNGP14.phx.gbl>...
> I'll add to what Chris has said if I may.
>
> By default, the option to bridge all site links is enabled. Translated,
> this means 'enable transitive links'. What you are seeing is normal, and as
> Chris said, is probably quite optimum. You'll notice there's at least two
> connections; that's fine. It doesn't necessitate connections to all DCs as
> it can pull the info. from other DCs, e.g. C pulls from B which pulls from
> A.
>
> Also, the ISTG (one of the KCCs picked to manage inter-site links) will
> decide on a bridgehead server. A bridgehead server will be the only
> connection to that site. All DCs within the site will pull from that
> bridgehead server (one way or another). Thus, reducing WAN traffic, as each
> site will only have a minimum number of inter-site connection objects.
>
> Obviously, if you have multiple domains, this can vary slightly depending on
> GC and DC placement. But that's something that's best explained with lots
> of nice diagrams : )
>
>
> --
>
> Paul Williams
>
> http://www.msresource.net
> http://forums.msresource.net
>
>
> "Chriss3 [MVP]" <noSpamHere@chrisse.se> wrote in message
> news:e9sjBe$yEHA.1524@TK2MSFTNGP09.phx.gbl...
> Hello Hooch
> The KCC use a set of algorithms when it create its connection objects for
> the most optimal replication topology. This can be hard to understand if you
> not know how the KCC works. The KCC should be trusted and should be used,
> there is some networks that may need a manually replication topology. Note
> that DCs that are Global Catalog Servers need to spook with at least on DC
> in each domain in the forest that's one reason why the numbers of connection
> objects can be different from DCs to DCs within same site as well one DC in
> each site is assigned the ISTG.
> --
> Regards
> Christoffer Andersson
> Microsoft MVP - Directory Services
>
> No email replies please - reply in the newsgroup
> ------------------------------------------------
> http://www.chrisse.se - Active Directory Tips
>
> "Hooch" <sfsmailtest@yahoo.co.uk> skrev i meddelandet
> news:65a551b3.0411160721.269e280c@posting.google.com...
> > Hi,
> >
> > Active Directory forest (server 2003) with 2 domains. There are 4
> > sites. There is a DC in each of the 4 sites for the child domain, and
> > 3 of the 4 sites have a DC for the root domain. At present all 4 sites
> > belong to 1 IP site link.
> >
> > Site A contains the first DC installed in the forest, and also the
> > first DC installed in the child domain. All DCs are global catalogs.
> >
> > When I open AD Sites and Services, expand out Site A, and look at the
> > auto generated connection objects for the root domain DC, it has a
> > connection for the 2 other root DCs in the other sites, and also to
> > the child domain DC (in Site A). If I look at the connections for the
> > child domain DC in Site A it has connections for all other child
> > domain DCs in the other sites, and the root domain DC in Site A.
> >
> > All this sounds fine to me. However, if I look at site B for example,
> > looking at the connections generated for the root domain DC in that
> > site, it has one to the root DC in Site A, and also the child domain
> > DC in its own site, but no reference to the third root DC in Site C.
> > This pattern is repeated for all the DCs in the other sites.
> >
> > Is this normal? I would have expected the KCC to have created more of
> > a mesh topology under the current site and site link setup, and this
> > looks very much like hub and spoke. If anyone has any suggestions I
> > would be very grateful. I am just trying to make sure that if anything
> > should happen to either of the DCs in Site A, replication will occur
> > as normal between the DCs in the other sites.
> >
> > Regards,
> > Ben
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