eigrp_lab3

拓扑图：

配置：

R1：

key chain ccna  key 1   key-string cisco call rsvp-sync !

interface Loopback1  ip address 1.1.1.1 255.255.255.0 ! interface Serial1/0  ip address 12.1.1.1 255.255.255.0  ip authentication mode eigrp 1 md5  ip authentication key-chain eigrp 1 ccna  serial restart-delay 0 ! router eigrp 1  network 1.0.0.0  network 12.0.0.0  no auto-summary

R2：

key chain ccna  key 1   key-string cisco call rsvp-sync ! interface Serial1/0  ip address 12.1.1.2 255.255.255.0  ip authentication mode eigrp 1 md5  ip authentication key-chain eigrp 1 ccna  serial restart-delay 0 ! interface Serial1/1  ip address 23.1.1.1 255.255.255.0  ip authentication mode eigrp 1 md5  ip authentication key-chain eigrp 1 ccna  serial restart-delay 0 ! router eigrp 1  network 12.0.0.0  network 23.0.0.0  no auto-summary !

R3：

key chain ccna  key 1   key-string ccie call rsvp-sync ! interface Loopback1  ip address 3.3.3.3 255.255.255.0 ! interface Serial1/0  ip address 23.1.1.2 255.255.255.0  ip authentication mode eigrp 1 md5  ip authentication key-chain eigrp 1 ccna  serial restart-delay 0 ! router eigrp 1  network 3.0.0.0  network 23.0.0.0  no auto-summary !

说明

1.R1与R2验证是成功的，因为他们的key ID和密钥都是相同的

2.R2和R3验证不成功，因为他们钥匙链的密钥不相同

DUAL-5-NBRCHANGE: IP-EIGRP 1: Neighbor 23.1.1.1 (Serial1/0) is down: Auth failure

R3#debug eigrp packet

EIGRP:  key id = 1, authentication mismatch

EIGRP: Serial1/0: ignored packet from 23.1.1.1, opcode = 5 (invalid authentication)