Lab 8. OSPF Filtering – Distribute List

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R1 telah membuat beberapa network /32 yang kemudian diadvertise ke OSPF dan EIGRP, selanjutnya route ganjil akan difilter oleh R2. Kemudian, kita lihat apakah ada pengaruhnya terhadap R3. Kondisi awal :

R2:
R2(config)#do sh ip route ospf
1.0.0.0/32 is subnetted, 1 subnets
O 1.1.1.1 [110/2] via 12.12.12.1, 03:17:26, FastEthernet0/0
3.0.0.0/32 is subnetted, 1 subnets
O 3.3.3.3 [110/2] via 23.23.23.3, 03:16:50, GigabitEthernet1/0
33.0.0.0/32 is subnetted, 3 subnets
O E1 33.33.33.1 [110/21] via 23.23.23.3, 00:03:47, GigabitEthernet1/0
O E1 33.33.33.2 [110/21] via 23.23.23.3, 00:03:47, GigabitEthernet1/0
O E1 33.33.33.3 [110/21] via 23.23.23.3, 00:03:47, GigabitEthernet1/0
100.0.0.0/32 is subnetted, 7 subnets
O IA 100.100.100.1 [110/2] via 12.12.12.1, 03:17:27, FastEthernet0/0
O IA 100.100.100.2 [110/2] via 12.12.12.1, 03:17:27, FastEthernet0/0
O IA 100.100.100.3 [110/2] via 12.12.12.1, 03:17:27, FastEthernet0/0
O E2 100.100.100.4 [110/20] via 12.12.12.1, 03:17:27, FastEthernet0/0
O E2 100.100.100.5 [110/20] via 12.12.12.1, 03:17:27, FastEthernet0/0
O E2 100.100.100.6 [110/20] via 12.12.12.1, 03:17:27, FastEthernet0/0
O E2 100.100.100.7 [110/20] via 12.12.12.1, 03:17:27, FastEthernet0/0

Konfigurasikan Filtering Distribute List Agar yang Boleh Lewat Hanya IP Genap Saja.

R2:
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
R2(config-router)#ex

Coba kita cek lagi.

R2:
R2(config)#do sh ip route ospf
33.0.0.0/32 is subnetted, 1 subnets
O E1 33.33.33.2 [110/21] via 23.23.23.3, 00:01:20, GigabitEthernet1/0
100.0.0.0/32 is subnetted, 3 subnets
O IA 100.100.100.2 [110/2] via 12.12.12.1, 00:01:20, FastEthernet0/0
O E2 100.100.100.4 [110/20] via 12.12.12.1, 00:01:20, FastEthernet0/0
O E2 100.100.100.6 [110/20] via 12.12.12.1, 00:01:20, FastEthernet0/0

Nah yang paling penting nih dan diperhatikan ospf databasenya yang tidak berubah meski sudah di filter, hal tersebut dikarenakan pada OSPF semua router dlam satu area memiliki database yang sama dan coba kalian cek di router lain ya gaesss.

R1:
R1(config)#do sh ip ospf database
    OSPF Router with ID (1.1.1.1) (Process ID 1)
        Router Link States (Area 0)

Link ID      ADV Router     Age Seq#     Checksum Link count
1.1.1.1     1.1.1.1     1809     0x8000001D     0x00901B 2
2.2.2.2     2.2.2.2     778     0x8000001B     0x002596 1

        Net Link States (Area 0)

Link ID     ADV Router     Age Seq#     Checksum
12.12.12.2     2.2.2.2     1533     0x80000018     0x00E503

        Summary Net Link States (Area 0)

Link ID     ADV Router     Age Seq#     Checksum
2.2.2.2     2.2.2.2     1285     0x80000019     0x00CA49
3.3.3.3     2.2.2.2     526     0x80000007     0x00CA56
23.23.23.0     2.2.2.2     526     0x80000007     0x000CDC
100.100.100.1     1.1.1.1     1809     0x80000019     0x001DD4
100.100.100.2     1.1.1.1     1809     0x80000019     0x0013DD
100.100.100.3     1.1.1.1 1    809     0x80000019     0x0009E6

        Summary ASB Link States (Area 0)

Link ID     ADV Router     Age Seq#     Checksum
3.3.3.3     2.2.2.2     526     0x80000007     0x00B26E

         Router Link States (Area 100)

Link ID     ADV Router     Age Seq#     Checksum Link count
1.1.1.1     1.1.1.1     1809     0x8000001C     0x00FF5C 3

        Summary Net Link States (Area 100)

Link ID     ADV Router     Age Seq#     Checksum
1.1.1.1     1.1.1.1     1809     0x80000019     0x001705
2.2.2.2     1.1.1.1     1809     0x80000018     0x00F423
3.3.3.3     1.1.1.1     552     0x80000007     0x00F231
12.12.12.0     1.1.1.1     1809     0x80000018     0x009567
23.23.23.0     1.1.1.1     552     0x80000007     0x0034B7

        Summary ASB Link States (Area 100)

Link ID     ADV Router     Age Seq#     Checksum
3.3.3.3     1.1.1.1     552     0x80000007     0x00DA49

        Type-5 AS External Link States
Link ID     ADV Router     Age Seq#     Checksum Tag
33.33.33.1     3.3.3.3     1105     0x80000002     0x00555A 0
33.33.33.2     3.3.3.3     1105     0x80000002     0x004B63 0
33.33.33.3     3.3.3.3     1105     0x80000002     0x00416C 0
100.100.100.4     1.1.1.1     1809     0x80000019     0x0053FF 0
100.100.100.5     1.1.1.1     1809     0x80000019     0x004909 0
100.100.100.6     1.1.1.1     1809     0x80000019     0x003F12 0
100.100.100.7     1.1.1.1     1809     0x80000019     0x00351B 0

Semua router dalam satu area yang sama memiliki OSPF database nya yang sama dan beriklut routing table dari R3.

R3:
R3(config)#do sh ip route ospf
1.0.0.0/32 is subnetted, 1 subnets
O IA 1.1.1.1 [110/3] via 23.23.23.2, 03:34:02, GigabitEthernet1/0
2.0.0.0/32 is subnetted, 1 subnets
O 2.2.2.2 [110/2] via 23.23.23.2, 03:34:02, GigabitEthernet1/0
12.0.0.0/24 is subnetted, 1 subnets
O IA 12.12.12.0 [110/2] via 23.23.23.2, 03:34:02, GigabitEthernet1/0
100.0.0.0/32 is subnetted, 5 subnets
O IA 100.100.100.2 [110/3] via 23.23.23.2, 03:34:02, GigabitEthernet1/0
O E2 100.100.100.4 [110/20] via 23.23.23.2, 03:33:52, GigabitEthernet1/0
O E2 100.100.100.5 [110/20] via 23.23.23.2, 03:33:52, GigabitEthernet1/0
O E2 100.100.100.6 [110/20] via 23.23.23.2, 03:33:52, GigabitEthernet1/0
O E2 100.100.100.7 [110/20] via 23.23.23.2, 03:33:52, GigabitEthernet1/0

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