Lab 45. OSPF GRE Tunnel

Sama seperti virtual link, GRE Tunnel ini berfungsi intuk menyambungkan OSPF yang areanya berbeda. Disini akan menggunakan tunnel antar area. Oke,langsung saja ke TKP gan

1. Topologi Lab

2. Metode Lab

• Masih menggunakan topologi sebelumnya
• Hapus konfigurasi virtual link
• Koonfigurasikan GRE Tunnel

3. Verifikasi

• Pastikan tabel routing semua router lengkap
• Pastikan semua ip bisa diakses oleh semua router

4. Konfigurasi

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

IDN-R2(config)#router os 1
IDN-R2(config-router)#no area 1 virtual-link 1.1.1.1
IDN-R2(config-router)#no area 2 virtual-link 3.3.3.3

IDN-R3(config)#router os 1
IDN-R3(config-router)#no area 2 virtual-link 2.2.2.2

Sekarang mulai konfig GRE Tunnelnya

IDN-R1(config)#int tun 1
IDN-R1(config-if)#ip add 102.102.102.1 255.255.255.0
IDN-R1(config-if)#tunnel source 12.12.12.1
IDN-R1(config-if)#tunnel destination 12.12.12.2
IDN-R1(config-if)#router os 1
IDN-R1(config-router)#net 102.102.102.1 0.0.0.0 a 0

IDN-R2(config)#int tun1
IDN-R2(config-if)#ip add 102.102.102.2 255.255.255.0
IDN-R2(config-if)#tunnel source 12.12.12.2
IDN-R2(config-if)#tunnel destination 12.12.12.1
IDN-R2(config-if)#router os 1
IDN-R2(config-router)#net 102.102.102.2 0.0.0.0 a 0
IDN-R2(config-router)#int tun2
IDN-R2(config-if)#ip add 203.203.203.2 255.255.255.0
IDN-R2(config-if)#tunnel source 23.23.23.2
IDN-R2(config-if)#tunnel destination 23.23.23.3
IDN-R2(config-if)#router os 1
IDN-R2(config-router)#net 203.203.203.2 0.0.0.0 a 0

IDN-R3(config)#int tun2
IDN-R3(config-if)#ip add 203.203.203.3 255.255.255.0
IDN-R3(config-if)#tunnel source 23.23.23.3
IDN-R3(config-if)#tunnel destination 23.23.23.2
IDN-R3(config-if)#router os 1
IDN-R3(config-router)#net 203.203.203.3 0.0.0.0 a 0

Oke, sekarang kita cek ip route lagi di  IDN-R1

IDN-R1(config-router)#do sh ip route | b Gat
Gateway of last resort is not set
     102.0.0.0/24 is subnetted, 1 subnets
C       102.102.102.0 is directly connected, Tunnel1
O    203.203.203.0/24 [110/22222] via 102.102.102.2, 00:02:03, Tunnel1
     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, 03:45:00, FastEthernet0/0
     3.0.0.0/32 is subnetted, 1 subnets
O IA    3.3.3.3 [110/22223] via 102.102.102.2, 00:00:01, Tunnel1
     23.0.0.0/24 is subnetted, 1 subnets
O IA    23.23.23.0 [110/11121] via 102.102.102.2, 00:03:52, Tunnel1
     12.0.0.0/24 is subnetted, 1 subnets
C       12.12.12.0 is directly connected, FastEthernet0/0

Lakukan ping

IDN-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 = 52/101/140 ms

Sukses gan!!