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IP Connectivity Simulator

EIGRP — Successor & Feasible Successor

R1 has three paths to reach network 10.10.10.0/24. Watch how EIGRP\'s DUAL algorithm picks the Successor from Feasible Distance, computes Feasible Successors via the Feasibility Condition (RD < FD), then failover instantly when the Successor fails.

EIGRP AS 100 · K1=1 K3=1 · AD 90/170
R110.10.10.0/24destinationR2via 10.0.12.21 GbpsR3via 10.0.13.3100 MbpsR4via 10.0.14.410 Mbps (long path)
R1 EIGRP topology table for 10.10.10.0/24
NeighborRD (reported)FD (feasible)Feasibility Condition (RD < current FD)Role
Routing table entry (installed)
Ready — click any control to see the DUAL algorithm play out.

Practice — quick check

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