I have had several problems trying to get ISDN to work as a backup to a Frame-relay interface without any success so far. The current attempt is shown below. In addition to the config below I have placed the backup commands on the serial sub-interface. I've also used floating static routes.
The use of floating static routes did work, however, this setup causes problems with Windows NT services bringing up the interface periodically.
There are many examples of frame-relay (or WAN link) backup using isdn lines on www.cisco.com. Those examples do have network topology with step-by-step config, verification and troubleshooting information too.
Pl. visit following url for many many sample configs
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