Re: Exchange 2007 Email Routing

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- The logical topology defined by AD site links is a layer on top of the physical network. AD replication and Exchange 2007 routing use the logical links defined.
- When defining AD Site Links, if you have a direct physical link between 2 Sites, it generally makes sense to have a logical Site link in AD as well.
- Having said that, even with the best path that logically traverses thru another location/AD Site, the first attempt is always to connect directly to the Hub Transport server(s) in the destination Site (unless a Hub Site is defined, in which case all messages must go through the HT server(s) in that Site).

--
Bharat Suneja
MVP - Exchange
www.zenprise.com
NEW blog location:
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"Bill Jenner" <BillJenner@xxxxxxxxxxxxxxxxxxxxxxxxx> wrote in message news:437E4A8C-18D4-4B40-A3BD-A8B07525836D@xxxxxxxxxxxxxxxx
I’ve been reading about how Exchange 2007 routes email and was hoping
somebody could help clarify my understanding?

I believe Exchange 2007 uses AD sites and the Inter-site Transport links
defined between sites to determine how to route an email within an AD
organization. According to the articles I’ve read it uses the costs defined
on the links to determine the least cost path to the destination Hub server
for the site where the mailbox server is located, but what actually happens
if the defined Inter-Site links do not match the actual network links that
physically exist?

For example if there were three sites in an organization A, B, and C which
are physically connected together in a triangle, but in AD sites there are
only Inter-Site connections defined from A to B and then from B to C. If an
email was going from site A to site C, although there is no link defined from
A to C in Sites and Services, surely from a network perspective the data
would be routed across the WAN link from A to C and not from A to B to C?

Can anybody advise me on this

Thanks,
Bill


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Relevant Pages

  • Re: Exchange 2007 Email Routing
    ... There is no direct connection between A and C, so based on AD topology HT in A can get to HT in C through HT in B. ... - Since the first attempt is direct connect, yes - that will be routed using the L3 network routing. ... AD replication and Exchange 2007 routing use the logical ... > I believe Exchange 2007 uses AD sites and the Inter-site Transport> links ...
    (microsoft.public.exchange.connectivity)
  • Re: Exchange 2007 Email Routing
    ... connection defined between site A and C in my example then surely layer 3 ... network routing will determine how the data reaches the destination server ... the Hub Transport serverin the destination Site (unless a Hub Site is ... I believe Exchange 2007 uses AD sites and the Inter-site Transport links ...
    (microsoft.public.exchange.connectivity)
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    (microsoft.public.windows.server.sbs)
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