Configuration 3 Routers Ethernet Back to Back
Basic IP Configuration
This configuration shows how to configure OSPF with areas. One area is the backbone area, or area 0. All other areas need a direct connection to area 0. The router who connects the two areas is the area border router (ABR).
The router ID is either taken from the highest loopback interface or manually configured. If you do not configure it manually you have the risk of a changing router ID. This could be problematic with virtual links.
Configurations:
R1
R2
R3
!
version 12.4
service timestamps debug datetime msec
service timestamps log datetime msec
no service password-encryption
!
hostname R3
!
boot-start-marker
boot-end-marker
!
enable secret 5 $1$621A$VIV26Z7R/w724et/XIKDm0
!
no aaa new-model
memory-size iomem 5
ip cef
!
no ip domain lookup
!
interface Loopback0
ip address 172.17.0.3 255.255.255.255
!
interface FastEthernet0/0
no ip address
shutdown
duplex auto
speed auto
!
interface FastEthernet0/1
description to R2 F0/1
ip address 192.168.100.6 255.255.255.252
speed 100
full-duplex
!
router ospf 100
router-id 172.17.0.3
log-adjacency-changes
network 172.17.0.3 0.0.0.0 area 10
network 192.168.100.6 0.0.0.0 area 10
!
ip forward-protocol nd
!
no ip http server
no ip http secure-server
!
control-plane
!
line con 0
exec-timeout 0 0
logging synchronous
stopbits 1
line aux 0
stopbits 1
line vty 0 4
password network
login
!
end
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