Example Description: RIP plaintext Verification

The steps for plaintext verification are as follows:

Topology

 

1. During plaintext authentication, when the authenticated Party sends the key chian, it sends the key with the lowest ID value without carrying the ID. After the authenticated party receives the key, compared with all the keys in your own key chain, if one key matches, it passes the authentication of the authenticated party.

2. Verification

The configuration on R1 is as follows:

 
 

  
  
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 
 
 

R2 is configured as follows:

 
 

  
  
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 
 
 

3. Router route table results

 
 

  
  
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 
 
 

 
 

  
  
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 
 
 

The process of plaintext verification has been completed.

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