EIGRP configuration with MD5 Authentication

In this post, I will show you simple of EIGRP with MD5 Authentication configuration.

Router 1

Router1>enable
Router1#configure terminal
Router1(config)#int s0/0/0
Router1(config-if)#ip add 172.16.20.1 255.255.255.0
Router1(config-if)#ip authentication mode eigrp 100 md5
Router1(config-if)#ip authentication key-chain eigrp 100 router01
Router1(config-if)#no shut

Router1(config-if)#int g0/0
Router1(config-if)#ip add 172.16.10.1 255.255.255.0
Router1(config-if)#no shut
Router1(config-if)#exit

Router1(config)#router eigrp 100
Router1(config-router)#no auto summary
Router1(config-router)#eigrp log-neighbor-changes
Router1(config-router)#network 172.16.0.0
Router1(config-router)#passive int g0/0
Router1(config-router)#key chain router01

Router1(config-keychain)#key 1
Router1(config-keychain-key)#key-string tiger
Router1(config-keychain-key)#accept-lifetime 06:00:00 Feb 28 2016 infinite
Router1(config-keychain-key)#send-lifetime 06:00:00 Feb 28 2016 06:00:00 Feb 29 2016
Router1(config-keychain-key)#exit
Router1(config)#exit
Router1#copy run start

Router 2

Router2>enable
Router2#configure terminal
Router2(config)#int s0/0/0
Router2(config-if)#ip add 172.16.20.2 255.255.255.0
Router2(config-if)#ip authentication mode eigrp 100 md5
Router2(config-if)#ip authentication key-chain eigrp 100 router02
Router2(config-if)#no shut

Router2(config)#int s0/0/1
Router2(config-if)#ip add 172.16.40.1 255.255.255.0
Router2(config-if)#ip authentication mode eigrp 100 md5
Router2(config-if)#ip authentication key-chain eigrp 100 router02
Router2(config-if)#no shut

Router2(config-if)#int g0/0
Router2(config-if)#ip add 172.16.10.1 255.255.255.0
Router2(config-if)#no shut
Router2(config-if)#exit

Router2(config)#router eigrp 100
Router2(config-router)#no auto summary
Router2(config-router)#eigrp log-neighbor-changes
Router2(config-router)#network 172.16.0.0
Router2(config-router)#passive int g0/0
Router2(config-router)#key chain router02

Router2(config-keychain)#key 1
Router2(config-keychain-key)#key-string tiger
Router2(config-keychain-key)#accept-lifetime 06:00:00 Feb 28 2016 infinite
Router2(config-keychain-key)#send-lifetime 06:00:00 Feb 28 2016 06:00:00 Feb 29 2016
Router2(config-keychain-key)#exit
Router2(config)#exit
Router2#copy run start

Router 3

Router3>enable
Router3#configure terminal
Router3(config)#int s0/0/0
Router3(config-if)#ip add 172.16.40.2 255.255.255.0
Router3(config-if)#ip authentication mode eigrp 100 md5
Router3(config-if)#ip authentication key-chain eigrp 100 router03
Router3(config-if)#no shut

Router3(config-if)#int g0/0
Router3(config-if)#ip add 172.16.50.1 255.255.255.0
Router3(config-if)#no shut
Router3(config-if)#exit

Router3(config)#router eigrp 100
Router3(config-router)#no auto summary
Router3(config-router)#eigrp log-neighbor-changes
Router3(config-router)#network 172.16.0.0
Router3(config-router)#passive int g0/0
Router3(config-router)#key chain router03

Router3(config-keychain)#key 1
Router3(config-keychain-key)#key-string tiger
Router3(config-keychain-key)#accept-lifetime 06:00:00 Feb 28 2016 infinite
Router3(config-keychain-key)#send-lifetime 06:00:00 Feb 28 2016 06:00:00 Feb 29 2016
Router3(config-keychain-key)#exit
Router3(config)#exit
Router3#copy run start