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EIGRP

Enhanced Interior Gateway Routing Protocol, Cisco's hybrid distance-vector IGP. Articles tagged EIGRP cover the DUAL algorithm, composite metric and K values, stub routing, adjacency requirements, and Cisco IOS XE configuration.

7 posts

EIGRP

EIGRP DUAL Algorithm Deep Dive: Successors, Feasible Successors, FD, RD

DUAL gives EIGRP sub-second failover via pre-computed feasible successors. The four key concepts (successor, FS, FD, RD), the feasibility condition that prevents loops, active states, and queries.

Apr 26, 2026 6 min read

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