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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