The default cost for the routing group connector is 1.
Another potential problem with coexistence is the use of restrictions on Exchange 2003 connectors.
The restrictions can be content related, such as allowing system and non - system messages. There are
other restrictions such as user permissions and scheduling. Exchange Server 2007 does not support
these restrictions with the exception of size and public folder referrals. They can cause a message to
pass from Exchange Server 2007 to Exchange 2003 over a connector that will not route the message
due to restrictions. It is a best practice, therefore, to remove any restrictions from Exchange 2003
connectors prior to Exchange Server 2007 ??™ s installation.
Link State Considerations
To understand the impact that link state has on routing, this section first takes a look at how Exchange
2003 uses link state information. Exchange 2003 uses link state to make routing decisions that avoid
routes that have connection problems. Exchange actually breaks down link state changes by major,
minor, and user versions.
Major version number: These are physical changes in routing topology. Examples include
the addition of a new connector to the routing group and changes to a connector ??™ s
configuration.
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Chapter 11: Exchange Server 2007 Routing
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Minor version number: These are changes to the state of existing connectors.
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