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 0.0.0.0 0.0.0.0 <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 ID’s 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.