Objective
Mempelajari solusi terhadap area lain yang tidak terhubung langsung ke area 0. dimana dalam lab kali ini yang digunakan adalah GRE Tunnel

Metode Lab

• Konfigurasikan melanjutkan sebelumnya
• Area 2 dan Area 3 tidak terhubung ke Area 0
• Gunakan GRE Tunnel1 untuk menghubungkan Area 2 ke Area 0, advertise interface ise GRE Tunnel1 ke OSPF area 0
• Gunakan GRE Tunnel2 untuk menghubungkan Area 3 ke Area 0, advertise interface GRE Tunnel2 ke OSPF Area 0

Verifikasi
Pastikan semua ip loopback yang berada pada area OSPF yang berbeda bisa saling di ping oleh semua operator

Hapus dulu konfigurasi virtual linknya

RM-R1(config)#router os 1
RM-R1(config-router)#no area 1 virtual-link 2.2.2.2
RM-R2(config)#router os 2
RM-R2(config-router)#no area 1 virtual-link 1.1.1.1
RM-R2(config-router)#no area 2 virtual-link 3.3.3.3
RM-R3(config)#router os 3
RM-R3(config-router)#no area 2 virtual-link 2.2.2.2

kemudian kita konfigurasikan GRE Tunnelnya

RM-R1(config)#int tun1
RM-R1(config-if)#ip address 102.102.102.1 255.255.255.0
RM-R1(config-if)#tunnel source 12.12.12.1
RM-R1(config-if)#tunnel destination 12.12.12.2
RM-R1(config-if)#exit
RM-R1(config)#router os 1
RM-R1(config-router)#network 102.102.102.1 0.0.0.0 area 0
RM-R2(config)#int tun1
RM-R2(config-if)#ip address 102.102.102.2 255.255.255.0
RM-R2(config-if)#tunnel source 12.12.12.2 
RM-R2(config-if)#tunnel destination 12.12.12.1
RM-R2(config-if)#router os 2
RM-R2(config-router)#network 102.102.102.2 0.0.0.0 area 0

cek lagi routing tabelnya

RM-R1(config-router)#do sh ip route
Codes: 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
       i - IS-IS, su - IS-IS summary, 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

     102.0.0.0/24 is subnetted, 1 subnets
C       102.102.102.0 is directly connected, 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, 00:00:43, FastEthernet0/0
     23.0.0.0/24 is subnetted, 1 subnets
O IA    23.23.23.0 [110/11175] via 102.102.102.2, 00:00:43, Tunnel1
     12.0.0.0/24 is subnetted, 1 subnets
C       12.12.12.0 is directly connected, FastEthernet0/0
RM-R1(config-router)#

network Area 2 sudah masuk dalam routing tabel, namun untuk network Area 3 masih belum terdapat dalam routing tabelnya.

RM-R2(config)#int tun2
RM-R2(config-if)#tunnel source 23.23.23.2 
RM-R2(config-if)#tunnel destination 23.23.23.3 
RM-R2(config-if)#ip address 203.203.203.2 255.255.255.0
RM-R2(config-if)#exit
RM-R2(config)#router os 2
RM-R2(config-router)#network 203.203.203.2 0.0.0.0 area 0
RM-R3(config)#int tun2
RM-R3(config-if)#tunnel source 23.23.23.3
RM-R3(config-if)#tunnel destination 23.23.23.2
RM-R3(config-if)#ip address 203.203.203.3 255.255.255.0
RM-R3(config-if)#exit
RM-R3(config)#router os 3
RM-R3(config-router)#network 203.203.203.3 0.0.0.0 area 0

Verifikasi

RM-R1(config-router)#do sh ip route
Codes: 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
       i - IS-IS, su - IS-IS summary, 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

     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, 00:00:52, 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, 00:05:15, FastEthernet0/0
     3.0.0.0/32 is subnetted, 1 subnets
O IA    3.3.3.3 [110/22223] via 102.102.102.2, 00:00:52, Tunnel1
     23.0.0.0/24 is subnetted, 1 subnets
O IA    23.23.23.0 [110/11175] via 102.102.102.2, 00:00:54, Tunnel1
     12.0.0.0/24 is subnetted, 1 subnets
C       12.12.12.0 is directly connected, FastEthernet0/0
RM-R1(config-router)#
RM-R2(config-router)#do sh ip route
Codes: 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
       i - IS-IS, su - IS-IS summary, 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

     102.0.0.0/24 is subnetted, 1 subnets
C       102.102.102.0 is directly connected, Tunnel1
C    203.203.203.0/24 is directly connected, Tunnel2
     1.0.0.0/32 is subnetted, 1 subnets
O       1.1.1.1 [110/11112] via 102.102.102.1, 00:02:24, Tunnel1
     2.0.0.0/32 is subnetted, 1 subnets
C       2.2.2.2 is directly connected, Loopback0
     3.0.0.0/32 is subnetted, 1 subnets
O IA    3.3.3.3 [110/11112] via 203.203.203.3, 00:02:24, Tunnel2
     23.0.0.0/24 is subnetted, 1 subnets
C       23.23.23.0 is directly connected, Serial0/0
     12.0.0.0/24 is subnetted, 1 subnets
C       12.12.12.0 is directly connected, FastEthernet0/0
RM-R2(config-router)#
RM-R3(config-router)#do sh ip route
Codes: 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
       i - IS-IS, su - IS-IS summary, 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

     102.0.0.0/24 is subnetted, 1 subnets
O       102.102.102.0 [110/22222] via 203.203.203.2, 00:03:23, Tunnel2
C    203.203.203.0/24 is directly connected, Tunnel2
     1.0.0.0/32 is subnetted, 1 subnets
O       1.1.1.1 [110/22223] via 203.203.203.2, 00:03:23, Tunnel2
     2.0.0.0/32 is subnetted, 1 subnets
O IA    2.2.2.2 [110/11112] via 203.203.203.2, 00:03:23, Tunnel2
     3.0.0.0/32 is subnetted, 1 subnets
C       3.3.3.3 is directly connected, Loopback0
     23.0.0.0/24 is subnetted, 1 subnets
C       23.23.23.0 is directly connected, Serial0/0
     12.0.0.0/24 is subnetted, 1 subnets
O IA    12.12.12.0 [110/11121] via 203.203.203.2, 00:03:26, Tunnel2
RM-R3(config-router)#
RM-R1(config-router)#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
RM-R1(config-router)#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 = 24/96/224 ms
RM-R1(config-router)#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 = 52/143/292 ms
RM-R1(config-router)#