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If the link between two routers is removed, the OSPF (Open Shortest Path First) protocol does not work correctly, and the dial-up route is not initiated when you use Microsoft Windows Server 2000.
When the secondary interface is disabled, the secondary router does not send a link state update. Therefore, the router table is never updated, and the demand dial interface is never dialed on the primary router.
This behavior is by design.
You can use RIP (Routing Information Protocol) to work around this issue.
For additional information about, click the following article number to view the article in the Microsoft Knowledge Base:
241545 How to implement RIP over RRAS in Windows 2000