Successor vs Feasible Successor

mzinzmzinz Member Posts: 328
I thought I understood Successor's and Feasible Successor's until I read something out of my BSCI book:
"To qualify as a feasible successor, a next-hop router must have an AD less than the FD of the current successor route"

And if I understand things correctly:
AD = Cost of all hops to destination added, starting at next hop.
FD = Cost of local router to next hop.

What situation would have the cost of an entire route be less than the cost of the first hop of the current route?? Am I understand this wrong?
2x 2950
2x 3550
2x 2650XM
2x 3640
1x 2801


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