What happen if the Feasibility Condition not satisfied and we can not pick a feasible successor?
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A feasible successor is just a backup route. Feasible successor routes are not used to forward traffic, only successor routes are. It is not necessary to have a backup route. If the successor route disappears with no feasible successor, then it triggers a recalculation and reconvergence for that route (queries sent to neighbors), and it may be possible that there is no other route to that destination, causing the route to be dropped.
answered Dec 22, 2020 at 4:29
