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Three Labeled Cards Defining Successor As The Route In Use, Feasible Distance As The Local Router'S Total Cost, And Feasible Successor As A Pre-Verified Instant Backup
CCNA

Successor, Feasible Successor, and Feasible Distance

DUAL relies on three closely related concepts to decide which route goes in the routing table and which routes stand ready as instant backups. This guide defines each one precisely, works through a real Feasibility Condition check using the same topology and numbers established in How to Calculate EIGRP Metric, and covers how OSPF’s fundamentally...

Muhammad Khattak 8 min read
Diagram Showing Eigrp'S Three Tables In Sequence — Neighbor Table, Topology Table, And Ip Routing Table — With The Topology Table Emphasized As Holding Every Candidate Route
CCNA

EIGRP Topology Table: Successors, Feasible Successors, and How It’s Built

EIGRP maintains three tables on every router: a neighbor table, a topology table, and an IP routing table. The neighbor table tracks the state of directly connected EIGRP neighbors. The topology table is where the real decision-making material lives — it stores every route each neighbor has advertised, not just the winner. This guide covers...

Muhammad Khattak 8 min read
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