Lab 9. OSPF-Gre Tunnel

selain menggunakan virtual-link kita bisa juga menghubungkan area yang tidak terhubung langsung dengan rea 0 dengan Gre-Tunnel kita konfigurasikan sama seperti Lab 8. OSPF - Virtual Link. Pertama kita hapus terlebih dahulu virtual link nya :

R1(config)#router ospf 1
R1(config-router)#no area 1 virtual-link 2.2.2.2

R2(config)#router ospf 2
R2(config-router)#no area 1 virtual-link 1.1.1.1

R3(config)#router ospf 3
R3(config-router)#no area 2 virtual-link 2.2.2.2

Sekarang kita konfigurasikan Gre - Tunnel nya

R1(config)#int tun12
R1(config-if)#ip address 21.21.21.1 255.255.255.0
R1(config-if)#tunnel source 12.12.12.1
R1(config-if)#tunnel destination 12.12.12.2
R2(config-if)#ip ospf 1 area 0

R2(config)#int tun12
R2(config-if)#ip address 21.21.21.2 255.255.255.0
R2(config-if)#tunnel source 12.12.12.2
R2(config-if)#tunnel destination 12.12.12.1
R2(config-if)#ip ospf 2 area 0
R2(config)#int tun23
R2(config-if)#ip address 32.32.32.2 255.255.255.0
R2(config-if)#tunnel source 23.23.23.2
R2(config-if)#tunnel destination 23.23.23.3
R2(config-if)#ip ospf 2 area 0

R3(config)#int tun23
R3(config-if)#ip address 32.32.32.3 255.255.255.0
R3(config-if)#tunnel source 23.23.23.3
R3(config-if)#tunnel destination 23.23.23.2
R3(config-if)#ip ospf 3 area 0

Sekarang kita cek routing table nya :

R1(config)#do sh ip route
1.0.0.0/32 is subnetted, 1 subnets
C 1.1.1.1 is directly connected, Loopback0
2.0.0.0/32 is subnetted, 1 subnets
O 2.2.2.2 [110/11] via 12.12.12.2, 01:02:00, FastEthernet0/0
3.0.0.0/32 is subnetted, 1 subnets
O IA 3.3.3.3 [110/2001] via 21.21.21.2, 00:01:36, Tunnel12
12.0.0.0/8 is variably subnetted, 2 subnets, 2 masks
C 12.12.12.0/24 is directly connected, FastEthernet0/0
L 12.12.12.1/32 is directly connected, FastEthernet0/0
21.0.0.0/8 is variably subnetted, 2 subnets, 2 masks
C 21.21.21.0/24 is directly connected, Tunnel12
L 21.21.21.1/32 is directly connected, Tunnel12
23.0.0.0/24 is subnetted, 1 subnets
O IA 23.23.23.0 [110/1010] via 21.21.21.2, 00:01:36, Tunnel12
32.0.0.0/24 is subnetted, 1 subnets
O 32.32.32.0 [110/2000] via 21.21.21.2, 00:01:36, Tunnel12

loopback R2 dan R3 sudah terdeteksi di R1.

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