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How to configure ISDN and backup leases on routers

How can I configure Integrated Services Digital Network (ISDN) and backup lease on my router?

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The easiest way to configure the backup link is to have floating static routes. If you are running any dynamic routing protocol, it will automatically provide connectivity in case of connectivity failure.

Hope this helps.

For more information:
Read this tip on Cisco router ISDN configuration.
This tip explains the essentials of dynamic routing.
See this expert response discussing floating static routes.

This was first published in May 2008

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