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OSPF GRE Tunnel

 

OSPF GRE Tunnel




Jika sebelumnya menggunakan virtual-link, untuk saat ini tersedia alternatifnya bisa juga menggunakan metode GRE_Tunnel

 R1 

R1(config)#router ospf 1 

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

R1(config-router)#exit 

R2 

R2(config)#router ospf 2 

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

R2(config-router)#no area 2 virtual-link 3.3.3.3 

R2(config-router)#exit 

R3 

R3(config)#router ospf 3 

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

R3(config-router)#exit 

Oke sudah kita hapus konfigurasi virtual-link nya, selanjutnya kita akan konfigurasi GRE Tunnel nya : R1

 R1(config)#int tunnel 1 

R1(config-if)#ip add 102.102.102.1 255.255.255.0 

R1(config-if)#tunnel source 12.12.12.1 

R1(config-if)#tunnel destination 12.12.12.2 

R1(config-if)#exit 

R1(config)#router ospf 1 

R1(config-router)#net 102.102.102.1 0.0.0.0 area 0 

R1(config-router)#exit 

R2 

R2(config)#int tunnel 1 

R2(config-if)#ip add 102.102.102.2 255.255.255.0 

R2(config-if)#tunnel source 12.12.12.2 

R2(config-if)#tunnel destination 12.12.12.1 

R2(config-if)#exit 

R2(config)#router ospf 2

R2(config-router)#network 102.102.102.2 0.0.0.0 area 0 

R2(config-router)#exit 

R1 

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 [110/2] via 12.12.12.2, 01:08:05, FastEthernet0/0 

 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 

 23.0.0.0/24 is subnetted, 1 subnets 

O IA 23.23.23.0 [110/1001] via 102.102.102.2, 00:02:15, Tunnel1 

 102.0.0.0/8 is variably subnetted, 2 subnets, 2 masks 

C 102.102.102.0/24 is directly connected, Tunnel1 

L 102.102.102.1/32 is directly connected, Tunnel1 

Network Area 2 sudah masuk ke dalam routing table, namun Area 3 masih belum nih temen-temen, kita harus membuat tunnel lagi pada R2 dan R3. 

R2 

R2(config)#int tunnel 2 

R2(config-if)#tunnel source 23.23.23.2

 R2(config-if)#tunnel destination 23.23.23.3 

R2(config-if)#ip add 203.203.203.2 255.255.255.0 

R2(config-if)#exit 

R2(config)#router ospf 2

R2(config-router)#network 203.203.203.2 0.0.0.0 area 0 

R2(config-router)#exit 

R3 

R3(config)#int tunnel 2 

R3(config-if)#tunnel source 23.23.23.3 

R3(config-if)#tunnel destination 23.23.23.2 

R3(config-if)#ip add 203.203.203.3 255.255.255.0 

R3(config-if)#exit 

R3(config)#router ospf 3 

R3(config-router)#network 203.203.203.3 0.0.0.0 area 0 

R3(config-router)#exit 

Cek kembali :

 R1 

R1(config)#do sh ip route ospf 

 2.0.0.0/32 is subnetted, 1 subnets 

O 2.2.2.2 [110/2] via 12.12.12.2, 01:30:02, FastEthernet0/0 

 3.0.0.0/32 is subnetted, 1 subnets 

O IA 3.3.3.3 [110/2001] via 102.102.102.2, 00:07:33, Tunnel1 

 23.0.0.0/24 is subnetted, 1 subnets 

O IA 23.23.23.0 [110/1001] via 102.102.102.2, 00:24:12, Tunnel1 

O 203.203.203.0/24 [110/2000] via 102.102.102.2, 00:17:43, Tunnel1 

R2 

R2(config)#do sh ip route ospf 

 1.0.0.0/32 is subnetted, 1 subnets 

O 1.1.1.1 [110/1001] via 102.102.102.1, 00:23:33, Tunnel1 

 3.0.0.0/32 is subnetted, 1 subnets 

O IA 3.3.3.3 [110/1001] via 203.203.203.3, 00:06:59, Tunnel2 

R3 

R3(config)#do sh ip route ospf 

 1.0.0.0/32 is subnetted, 1 subnets 

O 1.1.1.1 [110/2001] via 203.203.203.2, 00:09:26, Tunnel2 2.0.0.0/32 is subnetted, 1 subnets

O IA 2.2.2.2 [110/1001] via 203.203.203.2, 00:09:26, Tunnel2 12.0.0.0/24 is subnetted, 1 subnets 

O IA 12.12.12.0 [110/1001] via 203.203.203.2, 00:09:26, Tunnel2 102.0.0.0/24 is subnetted, 1 subnets 

O 102.102.102.0 [110/2000] via 203.203.203.2, 00:09:26, Tunnel2 

Test Ping : 

R1 

R1(config)#do ping 1.1.1.1 

Type escape sequence to abort.

 Sending 5, 100-byte ICMP Echos to 1.1.1.1, timeout is 2 seconds:

 !!!!! 

Success rate is 100 percent (5/5), round-trip min/avg/max = 1/2/4 ms

 R1(config)#do ping 2.2.2.2 

Type escape sequence to abort.

 Sending 5, 100-byte ICMP Echos to 2.2.2.2, timeout is 2 seconds:

 !!!!! 

Success rate is 100 percent (5/5), round-trip min/avg/max = 16/21/24 ms 

R1(config)#do ping 3.3.3.3

 Type escape sequence to abort. 

Sending 5, 100-byte ICMP Echos to 3.3.3.3, timeout is 2 seconds:

 !!!!!

 Success rate is 100 percent (5/5), round-trip min/avg/max = 40/56/88 ms

selesai

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