Mise en place d`une authentification Eigrp entre R1 et R3
R3(config)#key chain R1-R3
R3(config-keychain)#key 1
R3(config-keychain-key)#key-string CISCO12345
R3(config)int s1/2
R3(config-if)#ip authentication key-chain eigrp 300 R1-R3
R3(config-if)#ip authentication mode eigrp 300 md5
R1(config)#key chain R1-R3
R1(config-keychain)#key 1
R1(config-keychain-key)#key-string CISCO12345
R1(config)int s0/1
R1(config-if)#ip authentication key-chain eigrp 300 R1-R3
R1(config-if)#ip authentication mode eigrp 300 md5
Vérifications :
R1#show ip eigrp interfaces detail s0/1 IP-EIGRP interfaces for process 100 Xmit Queue Mean Pacing Time Multicast Pending Interface Peers Un/Reliable SRTT Un/Reliable Flow Timer Routes IP-EIGRP interfaces for process 300 Xmit Queue Mean Pacing Time Multicast Pending Interface Peers Un/Reliable SRTT Un/Reliable Flow Timer Routes Se0/1 1 0/0 64 0/15 303 0 Hello interval is 5 sec Next xmit serial Un/reliable mcasts: 0/0 Un/reliable ucasts: 5/15 Mcast exceptions: 0 CR packets: 0 ACKs suppressed: 3 Retransmissions sent: 1 Out-of-sequence rcvd: 0 Authentication mode is md5, key-chain is "R1-R3" Use unicast