Multi-Area OSPF configuration

Learner 0

* Topology:

* Configuration:

  • R1 configuration:
R1#sh run
Building configuration...

Current configuration : 731 bytes
!
version 15.4
no service timestamps log datetime msec
no service timestamps debug datetime msec
no service password-encryption
!
hostname R1
!
!
!
!
!
!
!
!
ip cef
no ipv6 cef
!
!
!
!
!
!
!
!
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!
!
spanning-tree mode pvst
!
!
!
!
!
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interface Loopback0
 ip address 1.1.1.1 255.255.255.255
!
interface GigabitEthernet0/0/0
 ip address 10.1.1.1 255.255.255.0
 duplex auto
 speed auto
!
interface GigabitEthernet0/0/1
 no ip address
 duplex auto
 speed auto
 shutdown
!
interface Vlan1
 no ip address
 shutdown
!
router ospf 1
 log-adjacency-changes
 network 10.1.1.1 0.0.0.0 area 1
 network 1.1.1.1 0.0.0.0 area 1
!
ip classless
!
ip flow-export version 9
!
!
!
!
!
!
!
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line con 0
!
line aux 0
!
line vty 0 4
 login
!
!
!
end
  • R2 configuration:
R2#sh run
Building configuration...

Current configuration : 778 bytes
!
version 15.4
no service timestamps log datetime msec
no service timestamps debug datetime msec
no service password-encryption
!
hostname R2
!
!
!
!
!
!
!
!
ip cef
no ipv6 cef
!
!
!
!
!
!
!
!
!
!
!
!
spanning-tree mode pvst
!
!
!
!
!
!
interface Loopback0
 ip address 2.2.2.2 255.255.255.255
!
interface GigabitEthernet0/0/0
 ip address 10.1.1.2 255.255.255.0
 duplex auto
 speed auto
!
interface GigabitEthernet0/0/1
 ip address 10.1.2.1 255.255.255.0
 duplex auto
 speed auto
!
interface Vlan1
 no ip address
 shutdown
!
router ospf 1
 log-adjacency-changes
 network 2.2.2.2 0.0.0.0 area 0
 network 10.1.2.0 0.0.0.255 area 0
 network 10.1.1.0 0.0.0.255 area 1
!
ip classless
!
ip flow-export version 9
!
!
!
!
!
!
!
!
line con 0
!
line aux 0
!
line vty 0 4
 login
!
!
!
end
  • R3 configuration:
R3#sh run
Building configuration...

Current configuration : 776 bytes
!
version 15.1
no service timestamps log datetime msec
no service timestamps debug datetime msec
no service password-encryption
!
hostname R3
!
!
!
!
!
!
!
!
ip cef
no ipv6 cef
!
!
!
!
license udi pid CISCO1941/K9 sn FTX15242C77
!
!
!
!
!
!
!
!
!
!
!
spanning-tree mode pvst
!
!
!
!
!
!
interface Loopback0
 ip address 3.3.3.3 255.255.255.255
 ip ospf 1 area 0
!
interface GigabitEthernet0/0
 ip address 10.1.3.1 255.255.255.0
 ip ospf 1 area 2
 duplex auto
 speed auto
!
interface GigabitEthernet0/1
 ip address 10.1.2.2 255.255.255.0
 ip ospf 1 area 0
 duplex auto
 speed auto
!
interface Vlan1
 no ip address
 shutdown
!
router ospf 1
 log-adjacency-changes
!
ip classless
!
ip flow-export version 9
!
!
!
!
!
!
!
!
line con 0
!
line aux 0
!
line vty 0 4
 login
!
!
!
end


R3#
  • R4 configuration:
R3 configuratR4#sh run
Building configuration...

Current configuration : 752 bytes
!
version 15.1
no service timestamps log datetime msec
no service timestamps debug datetime msec
no service password-encryption
!
hostname R4
!
!
!
!
!
!
!
!
ip cef
no ipv6 cef
!
!
!
!
license udi pid CISCO1941/K9 sn FTX152462Z0
!
!
!
!
!
!
!
!
!
!
!
spanning-tree mode pvst
!
!
!
!
!
!
interface Loopback0
 ip address 4.4.4.4 255.255.255.255
!
interface GigabitEthernet0/0
 ip address 10.1.3.2 255.255.255.0
 duplex auto
 speed auto
!
interface GigabitEthernet0/1
 no ip address
 duplex auto
 speed auto
 shutdown
!
interface Vlan1
 no ip address
 shutdown
!
router ospf 1
 log-adjacency-changes
 network 0.0.0.0 255.255.255.255 area 2
!
ip classless
!
ip flow-export version 9
!
!
!
!
!
!
!
!
line con 0
!
line aux 0
!
line vty 0 4
 login
!
!
!
end

  • Verification:
R1#sh ip rou
R1#sh ip route 
Codes: L - local, 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, E - EGP
       i - IS-IS, 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

     1.0.0.0/32 is subnetted, 1 subnets
C       1.1.1.1/32 is directly connected, Loopback0
     2.0.0.0/32 is subnetted, 1 subnets
O IA    2.2.2.2/32 [110/2] via 10.1.1.2, 00:23:39, GigabitEthernet0/0/0
     3.0.0.0/32 is subnetted, 1 subnets
O IA    3.3.3.3/32 [110/3] via 10.1.1.2, 00:23:39, GigabitEthernet0/0/0
     4.0.0.0/32 is subnetted, 1 subnets
O IA    4.4.4.4/32 [110/4] via 10.1.1.2, 00:23:39, GigabitEthernet0/0/0
     10.0.0.0/8 is variably subnetted, 4 subnets, 2 masks
C       10.1.1.0/24 is directly connected, GigabitEthernet0/0/0
L       10.1.1.1/32 is directly connected, GigabitEthernet0/0/0
O IA    10.1.2.0/24 [110/2] via 10.1.1.2, 00:23:39, GigabitEthernet0/0/0
O IA    10.1.3.0/24 [110/3] via 10.1.1.2, 00:23:39, GigabitEthernet0/0/0
  • R2 ip route:
R2#sh ip route
Codes: L - local, 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, E - EGP
       i - IS-IS, 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

     1.0.0.0/32 is subnetted, 1 subnets
O       1.1.1.1/32 [110/2] via 10.1.1.1, 00:31:51, GigabitEthernet0/0/0
     2.0.0.0/32 is subnetted, 1 subnets
C       2.2.2.2/32 is directly connected, Loopback0
     3.0.0.0/32 is subnetted, 1 subnets
O       3.3.3.3/32 [110/2] via 10.1.2.2, 00:31:46, GigabitEthernet0/0/1
     4.0.0.0/32 is subnetted, 1 subnets
O IA    4.4.4.4/32 [110/3] via 10.1.2.2, 00:31:46, GigabitEthernet0/0/1
     10.0.0.0/8 is variably subnetted, 5 subnets, 2 masks
C       10.1.1.0/24 is directly connected, GigabitEthernet0/0/0
L       10.1.1.2/32 is directly connected, GigabitEthernet0/0/0
C       10.1.2.0/24 is directly connected, GigabitEthernet0/0/1
L       10.1.2.1/32 is directly connected, GigabitEthernet0/0/1
O IA    10.1.3.0/24 [110/2] via 10.1.2.2, 00:31:46, GigabitEthernet0/0/1
  • R3 ip route:
R3#sh ip route
Codes: L - local, 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, E - EGP
       i - IS-IS, 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

     1.0.0.0/32 is subnetted, 1 subnets
O IA    1.1.1.1/32 [110/3] via 10.1.2.1, 00:32:27, GigabitEthernet0/1
     2.0.0.0/32 is subnetted, 1 subnets
O       2.2.2.2/32 [110/2] via 10.1.2.1, 00:32:27, GigabitEthernet0/1
     3.0.0.0/32 is subnetted, 1 subnets
C       3.3.3.3/32 is directly connected, Loopback0
     4.0.0.0/32 is subnetted, 1 subnets
O       4.4.4.4/32 [110/2] via 10.1.3.2, 00:32:32, GigabitEthernet0/0
     10.0.0.0/8 is variably subnetted, 5 subnets, 2 masks
O IA    10.1.1.0/24 [110/2] via 10.1.2.1, 00:32:27, GigabitEthernet0/1
C       10.1.2.0/24 is directly connected, GigabitEthernet0/1
L       10.1.2.2/32 is directly connected, GigabitEthernet0/1
C       10.1.3.0/24 is directly connected, GigabitEthernet0/0
L       10.1.3.1/32 is directly connected, GigabitEthernet0/0

R4 ip route:

R4#sh ip route
Codes: L - local, 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, E - EGP
       i - IS-IS, 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

     1.0.0.0/32 is subnetted, 1 subnets
O IA    1.1.1.1/32 [110/4] via 10.1.3.1, 00:33:08, GigabitEthernet0/0
     2.0.0.0/32 is subnetted, 1 subnets
O IA    2.2.2.2/32 [110/3] via 10.1.3.1, 00:33:08, GigabitEthernet0/0
     3.0.0.0/32 is subnetted, 1 subnets
O IA    3.3.3.3/32 [110/2] via 10.1.3.1, 00:33:08, GigabitEthernet0/0
     4.0.0.0/32 is subnetted, 1 subnets
C       4.4.4.4/32 is directly connected, Loopback0
     10.0.0.0/8 is variably subnetted, 4 subnets, 2 masks
O IA    10.1.1.0/24 [110/3] via 10.1.3.1, 00:33:08, GigabitEthernet0/0
O IA    10.1.2.0/24 [110/2] via 10.1.3.1, 00:33:08, GigabitEthernet0/0
C       10.1.3.0/24 is directly connected, GigabitEthernet0/0
L       10.1.3.2/32 is directly connected, GigabitEthernet0/0

R4#