Link state issues and routing issues in Exchange 2000 Server and in Exchange Server 2003

Link state issues and routing issues in Exchange 2000 Server and in Exchange Server 2003: "Connectors are not reported to be marked as 'DOWN'
When you use the Winroute.exe tool to view Exchange routing topology, you may see that connectors that are unavailable are reported as being available ( they are marked as 'UP'). This behavior may occur for the following connectors: �Connectors that use DNS to route. For example, this behavior may occur for SMTP connectors that use DNS instead of smart host.
�Microsoft Exchange 5.5 Server connectors or Exchange Development Kit (EDK) connectors. These connectors do not use link state routing.
�Routing group connectors with source bridgeheads of the 'any' type.
�Any connectors where one bridgehead is an Exchange 5.5 Server computer.
�Connectors that use smart host settings and recently changed smart hosts.


Link state oscillations: connectors are repeatedly marked as 'UP' and then as 'DOWN'
This common scenario involves connectors being marked as 'UP' and then as 'DOWN' repeatedly. It causes excessive link state updates between servers. These excessive link state updates cause a very expensive and frequent recalculation of routes within the server. This is also indicated by Event 4005 Reset Routes. This issue may occur in the following scenarios: "