OSPF Cisco IOS

Single Area configuration

Example 1

Example network 1

R1 config

hostname R1
!
interface fastethernet 0/0
  ip address 192.168.0.1 255.255.255.0
!
interface fastethernet 0/1
  ip address 10.0.1.1 255.255.255.0
!
router ospf 88
  network 192.168.0.0 0.0.0.255 area 0
  network 10.0.1.0 0.0.0.255 area 0

R2 config

hostname R2
!
interface fastethernet 0/0
  ip address 192.168.0.2 255.255.255.0
!
interface fastethernet 0/1
  ip address 10.0.2.1 255.255.255.0
!
router ospf 77
  network 192.168.0.0 0.0.0.255 area 0
  network 10.0.2.0 0.0.0.255 area 0

R3 config

hostname R3
!
interface fastethernet 0/0
  ip address 192.168.0.3 255.255.255.0
!
interface fastethernet 0/1
  ip address 10.0.3.1 255.255.255.0
!
interface serial 0/0
  ip address 172.16.0.1 255.255.255.252
!
router ospf 66
  network 192.168.0.0 0.0.0.255 area 0
  network 10.0.3.0 0.0.0.255 area 0
  network 172.16.0.0 0.0.0.3 area 0

R4 config

hostname R4
!
interface fastethernet 0/1
  ip address 10.0.4.1 255.255.255.0
!
interface serial 0/0
  ip address 172.16.0.2 255.255.255.252
router ospf 66
  network 172.16.0.0 0.0.0.3 area 0
  network 10.0.4.0 0.0.0.255 area 0