supoose R2's best route to R1 ( via R2- R1 link) has a metric m1. and
R3's best route to R1 ( via R3- R1 link) has a metric m2.
so if R2 advertise a route to R3 it will have a reported distance of m2 which is higher than the feasible distance for R1's network from R3.... Does not satisfying the feasibility condition. Such route may create routing loop. Check show ip eigrp topology all-link in R3. you can find the alternative route which is not a successor.
one line answer is the alternative route does not satisfying the feasibility condition so it is not selected as feasible successor
Thanks for the responses. Yes it turned out it was Split horizon, I disabled it and tested and now both routes were being seen.
I did already check to see if the the backup route met the feasible successor criteria by runnning the command "Show ip eigrp topology all-links" but the backup route was not even in there. Usually even if a route does not meet the criteria as a feasible successor, I would expect it to be in the topology all-links output.
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