5. Close the Registry Editor and restart the Simple Mail Transfer Protocol (SMTP) service, the
Microsoft Exchange Routing Engine, and the Microsoft Exchange MTA Stacks service.
Link State Islands
Exchange 2003 servers share link state information between servers in different routing groups through
the SMTP verb X-Link2State . Exchange Server 2007 does not understand the X-Link2State verb,
thus it will not propagate link state information to Exchange 2003. Even though minor link state is suppressed,
Exchange 2003 still needs to receive major updates, which are changes in the routing topology.
During migration, Exchange 2003 routing groups can become isolated. In this case, the routing group
won ??™ t be able to submit routing changes, or receive routing changes from other routing groups. To
ensure link state islands do not develop, leave Routing Group Connectors between Exchange 2003 routing
groups. When routing is not desirable, set the Routing Group Connector cost to 100. This prevents
normal traffic, but allows link state information to continue to propagate.
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Part III: Working with PowerShell in a Production Environment
320
Exchange Server 2007 Routing Group
(DWBGZMFD01QNBJR)
Routing Group A Routing Group B Routing Group C
RGC
Cost = 10
RGC
Cost = 10
RGC
Cost = 10
RGC
Cost = 10
RGC
Cost = 10
Figure 11-10
Figure 11-11
Now, Routing Group B is fully migrated to Exchange Server 2007 and the administrator decommissions
and removes the routing group and its connectors as illustrated in Figure 11 - 11 .
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