The cost can be thought of as the Exchange 2003 ??? legacy ??? Routing
Group Connector cost and the Exchange Server 2007 Active Directory site cost. The best route is the
route with the best legacy cost followed by the Active Directory site cost. Because of this design, routes
can stay within the Exchange Server 2007 routing group and go across site connectors with higher costs.
Consider the example in Figure 11 - 14 . A user in Site 1 on Exchange Server 2007 sends a mail to an
external recipient at exchangeexchange.com.
Chapter 11: Exchange Server 2007 Routing
323
Exchange Server 2007 Routing Group
(DWBGZMFD01QNBJR)
Routing Group A
Routing Group B
Smtp:exchangeexchange.com:10
RGC
Cost = 5
RGC
Cost = 5
Site Link
Cost = 100
Site 1 Site 2
RGC
Cost = 5
Figure 11-14
There are two routes the message could take in Figure 11 - 14 , shown in the following table.
Option Path Cost (Legacy, Site)
1 Site 1 to Routing Group A;
Routing Group A to Routing
Group B
20, 0
2 Site 1 to Site 2; Site 2 to Routing
Group B
15, 100
Even though the lowest cost route appears to be option 1, with a total cost of 20 is the path from Site 1 to
Routing Group A, then to Routing Group B. The other path has the lowest legacy cost, 15, and option 2
will be used.
Part III: Working with PowerShell in a Production Environment
324
Exchange Server 2007 Routing Group
(DWBGZMFD01QNBJR)
Routing Group A
RGC
Cost = 5
Site Link
Cost = 10
Site 1
Site 2
Smtp:exchangeexchange.
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