What is the Feasible Distance in EIGRP?

• A. The metric to the destination via a feasible successor
• B. The metric to the destination via the current successor
• C. The minimal metric to any neighbor
• D. The maximum metric observed in topology

Answer: (B)

Feasible Distance is the metric to reach the destination when using the current best next hop (the successor). It’s calculated as the cost to get to that successor plus the distance the successor reports to the destination. This value serves as the benchmark for evaluating other potential next hops: a neighbor can be a feasible successor only if its reported distance to the destination is less than the Feasible Distance. In short, FD = cost to successor + successor’s advertised distance, and it represents the actual distance to the destination via the current successor.