Hello,
Using the show idb command at this moment is somewhat of an overshoot. A most probable cause of your problem is the configuration so let's start by verifying that.
If you are connecting two routers in your lab by a back-to-back serial cable and you want to run Frame Relay encapsulation between them, one of these devices must be configured as Frame Relay DCE device (note that this is different and independent from physical cabling). The router performing as the FR switch must be configured as follows:
frame-relay switching
interface Serial ...
encapsulation frame-relay
frame-relay intf-type dce
! Other commands like frame-relay route to establish PVCs
no shutdown
Is your FR switch router configured in a similar way?
Configuring a device as FR DCE causes it to respond to LMI requests sent by FR end devices. The LMI messages are used to discover the individual PVCs and their state, and they serve as a general keepalive mechanism. If the LMI requests sent from your FR end device are not replied to by your FR switch, the FR end device concludes that the FR switch is not responding and brings the line protocol down.
Best regards,
Peter