Ipx over frame relay and route redistribution

Hi,
When I configure ipx over frame-relay multipoint interface, I need to run eigrp and disable the split horizon, and I'm running ipx rip on the same router thus, redistribution is automatic by default. This will cause potential routing loop when the route is advertised back from the same interface. In this situation, I have few questions:
1. How to prevent routing loop in this situation?
2. What is the administrative distance for ipx rip, eigrp, nslp?
3. How does eigrp and rip convert the metric?
Thank you
Fujin

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