When only one routing group connector is established between Exchange 2003 and Exchange 2007, you do not have to make any changes to link state, and routing loops will not occur. However, if more than one routing group connector is configured between Exchange 2003 and Exchange 2007, the minor link state updates that are transmitted between Exchange 2003 servers can introduce problems. When Exchange 2003 detects that a connector is unavailable, link state updates are communicated throughout the Exchange organization to notify them of the connector down state. The Exchange 2003 bridgehead server also tries to determine an alternative route for message transfer to the destination server. However, Exchange 2007 does not use link state to determine a routing path. The Exchange 2007 Hub Transport server will be unaware of the down connector state and may decide to route a message back through a routing path that Exchange 2003 is trying to route around.
Q es liknk state?? Disabel en 2003 para evitar problemas de looping:
To avoid routing loops, you must suppress minor link state updates before introducing additional routing group connectors. Minor link state updates are sent between Exchange 2003 servers to update the link state routing table to indicate that a connector is down. When the SuppressStateChanges registry key is set, you are turning off the ability for a connector to be marked as down. Link state messages are also used to notify Exchange 2003 servers of configuration changes to the Exchange organization, such as the addition or removal of a connector or a server. When you suppress minor link state updates, it does not prevent these major link state update messages from being communicated.
When minor link state updates are suppressed, Exchange 2003 also only uses least cost routing. This eliminates the chance for routing loops to occur. We recommend that you suppress link state updates on every Exchange 2003 server in the organization to maintain a consistent configuration.
Lo mas importante q me llamo mucho la atención:
mportant: If configuration changes are made in Exchange Routing Group (DWBGZMFD01QNBJR) some latency may occur before those changes are received by Exchange Server 2003 servers and propagated by the Exchange 2003 routing group masters. The delay will depend on how frequently the routing group masters poll for configuration changes in other routing groups. By default, the polling interval is set to one hour. To immediately register all changes in Exchange Routing Group (DWBGZMFD01QNBJR) on Exchange 2003 servers, you must restart the routing group masters.
Articulo:
http://technet.microsoft.com/en-us/library/bb125223%28EXCHG.80%29.aspx
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