Re: site link costs

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Meinolf - no problem - I'm glad I managed to contribute something here...

best regards,
Marcin

"Meinolf Weber" <meiweb(nospam)@gmx.de> wrote in message
news:ff16fb66b78f8cb05b6f5b233d0@xxxxxxxxxxxxxxxxxxxxxxx
Hello Marcin,

Thanks for the correction and clarification of this.:-)

This article gives more detailed information how AD replication is
working:
http://technet.microsoft.com/en-us/library/cc755994.aspx

Best regards

Meinolf Weber
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Meinolf,
actually that's not necessarily the case. For example, site link costs
also
come into play if a site does not have a local domain controller (e.g.
as
the result of its failure or simply based on an intended design) or if
a
domain controller at that site does not host all naming contexts that
are
being replicated. In such case, you might potentially have a few
remote
domain controllers that can provide site coverage or serve as the
replication partner to domain controllers at a down-stream site (via
site
link bridging), even if there are individual routes from one site to
another
(as long as there are several sites with domain controllers hosting
the same
naming context to choose from).
best regards,
Marcin
"Meinolf Weber" <meiweb(nospam)@gmx.de> wrote in message
news:ff16fb66b7558cb058a670b34a0@xxxxxxxxxxxxxxxxxxxxxxx

Hello childofthe1980s,

Site link costs are used when you have more then one route between
two sites, intersite replication occurs then on the one with the
least cost. So if i see your site setup, you have only one route
between your sites? The Active Directory Knowledge Consistency
Checker (KCC) considers a site link with a higher cost to be less
desirable than a site link with a lower cost. When multiple paths for
replication are available, the KCC prefers the site link with the
lower cost.

Also see here about Replication Concepts:
http://technet.microsoft.com/en-us/library/cc756899.aspx
Best regards

Meinolf Weber
Disclaimer: This posting is provided "AS IS" with no warranties, and
confers no rights.
** Please do NOT email, only reply to Newsgroups
** HELP us help YOU!!! http://www.blakjak.demon.co.uk/mul_crss.htm
Hello:

I'm trying to understand site link costs. If you go from site 1 to
site 2 over a bandwidth of 56 kbps, is a lower site link cost
prefereable?

If you go from site 2 to site 3 over a T3 line, is a higher site
cost preferable?

If you go from site 3 to site 4 over a T1 line, is a higher site
cost preferable than that of a T3 line?

I know that the KCC prefers to use a lower cost. But, again, I'm
trying to understand what the best site costs are, depending on the
speed of the lines from site to site. Any insight that you can give
would be great!

Thanks!

childofthe1980s





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Relevant Pages

  • Re: site link costs
    ... This article gives more detailed information how AD replication is working: ... replication partner to domain controllers at a down-stream site (via ... Site link costs are used when you have more then one route between ... Checker considers a site link with a higher cost to be less ...
    (microsoft.public.windows.server.active_directory)
  • Re: Help with active directory site
    ... 30 mins replication between VPN connected sites, ... leave a default link with a cost of 100, so that if my main site DC is ... You can delete connection objects and let them be ... How do I configure the cost of a site link bridge? ...
    (microsoft.public.windows.server.active_directory)
  • Re: AD Intersite replication
    ... In AD you create site link A-to-B for WANA-B and assign costs 40 ... Replication between LocA and LocB will take place over site link A-to-B (and ... Because you "told" by configuring the cost that is more fast to ... Site link transitivity is enabled or disabled by selecting the Bridge All ...
    (microsoft.public.windows.server.active_directory)
  • Re: AD Intersite replication
    ... 1] why would you at all create a site link between site B & C if AD is going ... 3] also if the WAN link between A to B is down, then how would replication ... LocA and LocB are connected by a redundant WAN link WanA and WanB ... AD will always use the site link with the lowest cost to create its ...
    (microsoft.public.windows.server.active_directory)
  • Re: AD Intersite replication
    ... LocA and LocB are connected by a WAN link WanA-B ... Replication between LocA and LocB will take place over site link A-to-B (and ... Because you "told" by configuring the cost that is more fast to ... Site link transitivity is enabled or disabled by selecting the Bridge All ...
    (microsoft.public.windows.server.active_directory)