Lab 16. OSPF - Default Route

Konfigurasikan OSPF yang akan di set default route nantinya

R1(config)#router ospf 1
R1(config-router)#network 1.1.1.1 0.0.0.0 area 0
R1(config-router)#network 12.12.12.0 0.0.0.255 area 0

R2(config)#router ospf 2
R2(config-router)#network 12.12.12.0 0.0.0.255 area 0
R2(config-router)#network 23.23.23.0 0.0.0.255 area 0
R2(config-router)#network 2.2.2.2 0.0.0.0 area 0

R3(config)#router ospf 3
R3(config-router)#network 23.23.23.0 0.0.0.255 area 0
R3(config-router)#network 3.3.3.3 0.0.0.0 area 0

tambah ip loopback yang tidak akan diadvertise ke ospf, loopback ini tidak masuk routing table hanya sebagi uji coba default route.

R1(config)#int lo1
R1(config-if)#ip address 10.10.10.1 255.255.255.255
R1(config-if)#int lo2
R1(config-if)#ip address 10.10.10.2 255.255.255.255
R1(config)#int lo3
R1(config-if)#ip address 10.10.10.3 255.255.255.255

R1(config)#router ospf 1
R1(config-router)#default-information originate always

Perintah diatas berfungsi untuk mendistribusikan default route kedalam ospf. Keyword always berfungsi bila tidak ada baris perintah static default route (ip route x.x.x.x)

R2(config)#do sh ip route
Gateway of last resort is 12.12.12.1 to network 0.0.0.0
O*E2 0.0.0.0/0 [110/1] via 12.12.12.1, 00:00:29, Ethernet0/0
1.0.0.0/32 is subnetted, 1 subnets
O 1.1.1.1 [110/11] via 12.12.12.1, 00:05:20, Ethernet0/0
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 3.3.3.3 [110/11] via 23.23.23.3, 00:04:48, Ethernet0/1
12.0.0.0/8 is variably subnetted, 2 subnets, 2 masks
C 12.12.12.0/24 is directly connected, Ethernet0/0
L 12.12.12.2/32 is directly connected, Ethernet0/0
23.0.0.0/8 is variably subnetted, 2 subnets, 2 masks
C 23.23.23.0/24 is directly connected, Ethernet0/1

L 23.23.23.2/32 is directly connected, Ethernet0/1

R2(config)#do ping 10.10.10.1
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 10.10.10.1, timeout is 2 seconds:
!!!!!
Success rate is 100 percent (5/5), round-trip min/avg/max = 1/1/1 ms

R3(config)#do sh ip route 10.10.10.2
% Network not in table

bisa dilihat diatas ip 10.10.10.1 yang ada pada loopback sudah bisa di ping tapi apabila di cek di routing table tidak terdeteksi.

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