EIGRP stands for Enhanced Interior Gateway Routing Protocol  is an interior gateway protocol .

This protocol was earlier IGRP (interior gateway routing protocol) but was later was modified by cisco and now this protocol only works on the cisco routers.

It uses the Diffusing-Update Algorithm (DUAL) to determine the most efficient (least cost) route to a destination.

This protocol supports VLSM , class less routing and route summarization.

This is a advanced distant vector routing protocol.

The protocol contains

•    Neighbor table – stores information about neighbors
•    Topology table – stores routing information learned from neighboring routers
•    Routing table –  stores the best routes

this protocol uses the concept to autonomous system number.

the routers running on same autonomous system number communicate with each other .

LAB configuration of the protocol
in the above lab we are using two cisco 2811 series router and two 24 ports switch and pc’s

Router(config)#int fa 0/0

Router(config-if)#ip add

Router(config-if)#no sh


%LINK-5-CHANGED: Interface FastEthernet0/0, changed state to up

%LINEPROTO-5-UPDOWN: Line protocol on Interface FastEthernet0/0, changed state to up


Router(config)#int se 0/1/0

Router(config-if)#ip add

Router(config-if)#no sh

Router(config)#router eigrp ?

<1-65535> Autonomous system number

Router(config)#router eigrp 10




applying DHCP

Router(config)#ip dhcp pool sachtech




now we will configure router 2


Router(config-if)#int fa 0/0

Router(config-if)#ip add

Router(config-if)#no sh


Router(config)#int se 0/0/0

Router(config-if)#ip add

Router(config-if)#no sh

now lets configure eigrp protocol


Router(config)#router eigrp 10



now most importantly lets check the connectivity between the different pc


as we see below all the pc are able to ping each other successfully .




Router#sh ip route

C is directly connected, FastEthernet0/0

C is directly connected, Serial0/1/0

D [90/2172416] via, 00:05:43, Serial0/1/0

and its done




46 thoughts on “EIGRP

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