CCNA LAB : Single Area OSPF Configuration with MD5 Authentication

Configuring MD5 Authentication

Router(config-if)#ip ospf message-digest-key key-id md5 key

Router(config-if)# ip ospf authentication [message-digest | null]

Router(config-router)#area area-id authentication [message-digest]

key-id --> An identifier in the range from 1 to 255

key --> Alphanumeric password of up to 16 bytes

RTA ROUTER

Router>enable

Router#configure terminal

Router(config)#hostname RTA

RTA(config)#interface loopback 0

RTA(config-if)#ip address 2.2.2.2 255.255.255.0

RTA(config-if)#exit

RTA(config)#interface serial 0/0

RTA(config-if)#ip address 192.168.1.1 255.255.255.252

RTA(config-if)#ip ospf message-digest-key 1 md5 thewayofccie

RTA(config-if)# ip ospf authentication message-digest

RTA(config-if)#clock rate 64000

RTA(config-if)#no shutdown

RTA(config-if)#exit

RTA(config)#interface fastethernet 0/0

RTA(config-if)#ip address 192.168.10.1 255.255.255.0

RTA(config-if)#no shutdown

RTA(config-if)#exit

RTA(config)#router ospf 65

RTA(config-router)#network 192.168.1.0 0.0.0.255 area 0

RTA(config-router)#network 192.168.10.0 0.0.0.255 area 0

RTA (config-router)#network 2.2.2.0 0.0.0.255 area 0

RTA(config-router)#area 0 authentication message-digest

RTA(config-router)#exit

RTA(config)#exit

RTA#copy running-config startup-config

RTB ROUTER

Router>enable

Router#configure terminal

Router(config)#hostname RTB

RTB (config)#interface loopback 0

RTB (config-if)#ip address 3.3.3.3 255.255.255.0

RTB (config-if)#exit

RTB (config)#interface serial0/0

RTB (config-if)#ip address 192.168.1.2 255.255.255.252

RTB (config-if)#ip ospf message-digest-key 1 md5 thewayofccie

RTB(config-if)# ip ospf authentication message-digest

RTB (config-if)#no shutdown

RTB(config-if)#exit

RTB(config)#interface fastethernet 0/0

RTB (config-if)#ip address 192.168.20.1 255.255.255.0

RTB (config-if)#no shutdown

RTB (config)#router ospf 65

RTB (config-router)#network 192.168.1.0 0.0.0.255 area 0

RTB (config-router)#network 192.168.20.0 0.0.0.255 area 0

RTB (config-router)#network 3.3.3.0 0.0.0.255 area 0

RTB(config-router)#area 0 authentication message-digest

RTB (config-router)#exit

RTB (config)#exit

RTB #copy running-config startup-config