明文验证步骤如下：
拓扑如图：
1、明文认证时，被认证方发送key chian时，发送最低ID值的key，并且不携带ID；认证方接收到key后，和自己key chain的全部key进行比较，只要有一个key匹配就通过对被认证方的认证。
2、验证
R1上配置为：
key chain rip-key
key 1
key-string ccxx02
!
interface FastEthernet0/0
ip address 192.168.12.1 255.255.255.0
ip rip authentication key-chain rip-key
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R2上配置为：
key chain rip-key
key 1
key-string ccxx01
key 2
key-string ccxx02
!
interface FastEthernet0/0
ip address 192.168.12.2 255.255.255.0
ip rip authentication key-chain rip-key
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3、路由器的路由表结果
R1#show ip route
Codes: C - connected, S - static, R - RIP, M - mobile, B - BGP
D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter area
N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2
E1 - OSPF external type 1, E2 - OSPF external type 2
i - IS-IS, su - IS-IS summary, L1 - IS-IS level-1, L2 - IS-IS level-2
ia - IS-IS inter area, * - candidate default, U - per-user static route
o - ODR, P - periodic downloaded static route
Gateway of last resort is not set
C 192.168.12.0/24 is directly connected, FastEthernet0/0
C 192.168.1.0/24 is directly connected, Loopback0
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R2#show ip route
Codes: C - connected, S - static, R - RIP, M - mobile, B - BGP
D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter area
N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2
E1 - OSPF external type 1, E2 - OSPF external type 2
i - IS-IS, su - IS-IS summary, L1 - IS-IS level-1, L2 - IS-IS level-2
ia - IS-IS inter area, * - candidate default, U - per-user static route
o - ODR, P - periodic downloaded static route
Gateway of last resort is not set
C 192.168.12.0/24 is directly connected, FastEthernet0/0
R 192.168.1.0/24 [120/1] via 192.168.12.1, 00:00:15, FastEthernet0/0
C 192.168.2.0/24 is directly connected, Loopback0
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明文验证的过程就为大家介绍完了，希望大家已经掌握。
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