Source: https://technet.microsoft.com/en-us/library/jj916681%28v=exchg.150%29.aspx
In your Exchange organization, you may want to force all message
delivery through a specific Active Directory site. You can use the Shell
to designate an Active Directory site as a hub site. When you do this,
you cause additional overall overhead because more servers are involved
in message delivery. For example, consider a message that's sent from
Site A to Site E. If the least-cost routing path is
Site A-Site B-Site C-Site D-Site E, and you designate Site C as a hub
site, the message is relayed from Site A to Site C and then relayed from
Site C to Site E.
You use the Set-AdSite cmdlet
to specify an Active Directory site as a hub site. Whenever a hub site
exists along the least-cost routing path for message delivery, the
messages are queued and are processed by the Transport service on
Mailbox servers in the hub site before they're relayed to their ultimate
destination.
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