com:10
Site 3
Smtp:exchangeexchange.com:10
Routing Group B
Smtp:exchangeexchange.com:10
Site Link
Cost = 50
Site Link
Cost = 100
RGC
Cost = 5
RGC
Cost = 5
Figure 11-15
Building on that example, if a third Active Directory site is added to the picture, and Send Connectors
are added to the Hub Transport servers in Site 2 and Site 3, the routing now looks like Figure 11 - 15 .
Chapter 11: Exchange Server 2007 Routing
325
The resulting route would be option 4, from Site 1 to Site3. This is because it has the lowest legacy cost,
followed by the lowest site cost.
Summary
This chapter started by showing the differences between Exchange 2003 and Exchange Server 2007. The
routing has gone through significant modifications, including integration with Active Directory sites,
deterministic routing, and separation of transport from the mailbox server. This chapter showed how
these changes enable more efficient routing based on Active Directory replication and network topology.
It also enables transport rules enforcement, which guarantees every message routes through a Hub
Transport server, even when users are located on the same server, or even the same database.
This chapter explained the route selection process and how Exchange builds a least cost route. Another
major change is that messages are directly routed when possible.
Pages:
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462