Router R5 Configuration (also for R6, R7)


R5(config)#int s0/0

R5(config-if)#ip address <ip addr> <subnet mask>


R5(config)#Router EIGRP <as>

R5(config-router)#network <ip addr> <wildcard mask> (IP of our EIGRP network)

R5(config-router)#network <ip addr> <wildcard mask> (IP of R4 network)

R5(config-router)#no auto-summary (reqd depending on network)


R5(config)ip route <ip addr> (IP of next hop to outside world, eg R12)


Router show and debug commands

show run

show controllers

show controllers s0/0

show interfaces s0/0

show ip protocols

show ip route

show ip eigrp topology [ ip addr | all-links ] (Displays feasible successors)

show ip eigrp neighbors (Displays neighbor table)

show ip eigrp interfaces (shows eigrp information for each interface)



EIGRP has 3 x Tables

Neighbor Table Information on adjacent routers, IP, holdtime, RTT, Q cnt,

Topology Table FD, RD, Successor Routes, Route tagging, Router IDs and copy of routing table

Routing Table Successor (Primary) routes to destinations.

Passive Route up and stable

Active Route down, being re-calculated by DUAL


EIGRP uses DUAL (Diffusing Update Algorithm, which uses Neighbor and Topology tables to create loop-free, lowest cost routes and stores them in the routing table.