Lab 10. OSPF - Filtering Route Access List

Pada lab kali ini kita akan memfilter dengan menggunakan salah satu dari sekian metode yang bisa kita lakukan untuk memfilter yaitu dengan Access List + Distribute List
Pertama kita buat loopback pada R1 :

R1(config)#int lo0
R1(config-if)#ip address 1.1.1.1 255.255.255.255
R1(config-if)#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-if)#int lo3
R1(config-if)#ip address 10.10.10.3 255.255.255.255
R1(config-if)#int lo4
R1(config-if)#ip address 10.10.10.4 255.255.255.255
R1(config-if)#int lo5
R1(config-if)#ip address 10.10.10.5 255.255.255.255
R1(config-if)#int lo6
R1(config-if)#ip address 10.10.10.6 255.255.255.255

Konfifurasi OSPF di setiap router

R1(config)#router ospf 1
R1(config-router)#router-id 1.1.1.1
R1(config-router)#network 10.10.10.0 0.0.0.255 area 1
R1(config-router)#network 12.12.12.0 0.0.0.255 area 0
R1(config-router)#network 1.1.1.1 0.0.0.0 area 0

R2(config)#router ospf 2
R2(config-router)#router-id 2.2.2.2
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)#router-id 3.3.3.3
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

Kemudian kita cek table routing nya

IDN-R2(config)#do sh ip route
1.0.0.0/32 is subnetted, 1 subnets
O 1.1.1.1 [110/11] via 12.12.12.1, 00:00:05, 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, 00:00:05, Ethernet0/1
10.0.0.0/32 is subnetted, 6 subnets
O IA 10.10.10.1 [110/11] via 12.12.12.1, 00:00:05, Ethernet0/0
O IA 10.10.10.2 [110/11] via 12.12.12.1, 00:00:05, Ethernet0/0
O IA 10.10.10.3 [110/11] via 12.12.12.1, 00:00:05, Ethernet0/0
O IA 10.10.10.4 [110/11] via 12.12.12.1, 00:00:05, Ethernet0/0
O IA 10.10.10.5 [110/11] via 12.12.12.1, 00:00:05, Ethernet0/0
O IA 10.10.10.6 [110/11] via 12.12.12.1, 00:00:05, Ethernet0/0
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

disini kita hanya akan mengijinkan ip genap yang bisa lewat, kita konfigurasi distribute list nya

R2(config)#access-list 1 permit 0.0.0.0 255.255.255.254
R2(config)#router ospf 2
R2(config-router)#distribute-list 1 in

sekarang kita cek routing table di R2 yang tadi kita konfigurasi distribute list

DN-R2(config-router)#do sh ip route
2.0.0.0/32 is subnetted, 1 subnets
C 2.2.2.2 is directly connected, Loopback0
10.0.0.0/32 is subnetted, 3 subnets
O IA 10.10.10.2 [110/11] via 12.12.12.1, 00:00:04, Ethernet0/0
O IA 10.10.10.4 [110/11] via 12.12.12.1, 00:00:04, Ethernet0/0
O IA 10.10.10.6 [110/11] via 12.12.12.1, 00:00:04, Ethernet0/0
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

bisa kita lihat hanya ip genap sekarang yang ada di routing table R2, filtering ini hanya berfungsi pada R2 karena hanya dikonfigurasi di R2, sedangkan di R1 dan R3 akan tetap.

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