Lab 9. OSPF Sumarization – Internal Router

Ada dua cara untuk melakukan summarization :

• Dikonfigurasi pada Router ABR (LSA Type 3) → Internal Route menggunakan perintah “area xx range”

• Dikonfigurasi pada Router ASBR (LSA Type 5) → External Route menggunakan perintah “summary-address”

OSPF Internal Route Summarization pada konfig sebelumnya pada R1 ada beberapa network yang sudah diadvertise ke area 100 dan ini berarti R1 sudah menjadi ABR karena menjembatani area 0 dengan area 100.

R1:

R1(config)#do sh run | section ospf

R1(config)#router ospf 1

R1(config)# router-id 1.1.1.1

R1(config)# redistribute eigrp 10 subnets

R1(config)# network 1.1.1.1 0.0.0.0 area 0

R1(config)#network 12.12.12.1 0.0.0.0 area 0

R1(config)#network 100.100.100.1 0.0.0.0 area 100

R1(config)#network 100.100.100.2 0.0.0.0 area 100

R1(config)#network 100.100.100.3 0.0.0.0 area 100

Karena kita masih menlanjutkan lab ini dari lab sebelumnya jadi kita hapus terlebih dahulu untuk konfigurasi access-list distribute list pada R2

R2:

R2(config)#no access-list 1 permit 0.0.0.0 255.255.255.254

R2(config)#router ospf 2

R2(config-router)#no distribute-list 1 in

R2(config-router)#ex

Lalu cek routing tabel pada 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, 04:10:36, GigabitEthernet1/0

2.0.0.0/32 is subnetted, 1 subnets

O 2.2.2.2 [110/2] via 23.23.23.2, 04:10:36, GigabitEthernet1/0

12.0.0.0/24 is subnetted, 1 subnets

O IA 12.12.12.0 [110/2] via 23.23.23.2, 04:10:36, GigabitEthernet1/0

100.0.0.0/32 is subnetted, 7 subnets

O IA 100.100.100.1 [110/3] via 23.23.23.2, 00:04:13, GigabitEthernet1/0

O IA 100.100.100.2 [110/3] via 23.23.23.2, 04:10:36, GigabitEthernet1/0

O IA 100.100.100.3 [110/3] via 23.23.23.2, 00:04:13, GigabitEthernet1/0

O E2 100.100.100.4 [110/20] via 23.23.23.2, 04:10:26, GigabitEthernet1/0

O E2 100.100.100.5 [110/20] via 23.23.23.2, 04:10:26, GigabitEthernet1/0

O E2 100.100.100.6 [110/20] via 23.23.23.2, 04:10:26, GigabitEthernet1/0

O E2 100.100.100.7 [110/20] via 23.23.23.2, 04:10:26, GigabitEthernet1/0

Konfigurasikan summarization di R1.

R1:

R1(config)#router ospf 1

R1(config-router)#area 100 range 100.100.100.0 255.255.255.248

R1(config-router)#ex

Cek lagi 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, 05:05:46, GigabitEthernet1/0

2.0.0.0/32 is subnetted, 1 subnets

O 2.2.2.2 [110/2] via 23.23.23.2, 05:05:46, GigabitEthernet1/0

12.0.0.0/24 is subnetted, 1 subnets

O IA 12.12.12.0 [110/2] via 23.23.23.2, 05:05:46, GigabitEthernet1/0

100.0.0.0/8 is variably subnetted, 5 subnets, 2 masks

O IA 100.100.100.0/29 [110/3] via 23.23.23.2, 00:27:35, GigabitEthernet1/0

O E2 100.100.100.4/32

[110/20] via 23.23.23.2, 05:05:36, GigabitEthernet1/0

O E2 100.100.100.5/32

[110/20] via 23.23.23.2, 05:05:36, GigabitEthernet1/0

O E2 100.100.100.6/32

[110/20] via 23.23.23.2, 05:05:36, GigabitEthernet1/0

O E2 100.100.100.7/32

[110/20] via 23.23.23.2, 05:05:36, GigabitEthernet1/0

Nah sudah ter summary kan network 100.100.100.0 nya. Cek di R1.

R1:

R1(config)#do sh ip ro

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 IA 2.2.2.2 [110/2] via 12.12.12.2, 00:29:19, FastEthernet0/0

3.0.0.0/32 is subnetted, 1 subnets

O IA 3.3.3.3 [110/3] via 12.12.12.2, 00:29:19, FastEthernet0/0

12.0.0.0/8 is variably subnetted, 2 subnets, 2 masks

C 12.12.12.0/24 is directly connected, FastEthernet0/0

L 12.12.12.1/32 is directly connected, FastEthernet0/0

23.0.0.0/24 is subnetted, 1 subnets

O IA 23.23.23.0 [110/2] via 12.12.12.2, 00:29:19, FastEthernet0/0

33.0.0.0/32 is subnetted, 3 subnets

O E1 33.33.33.1 [110/22] via 12.12.12.2, 00:29:19, FastEthernet0/0

O E1 33.33.33.2 [110/22] via 12.12.12.2, 00:29:19, FastEthernet0/0

O E1 33.33.33.3 [110/22] via 12.12.12.2, 00:29:19, FastEthernet0/0

100.0.0.0/8 is variably subnetted, 8 subnets, 2 masks

O 100.100.100.0/29 is a summary, 00:29:19, Null0

C 100.100.100.1/32 is directly connected, Loopback1

C 100.100.100.2/32 is directly connected, Loopback2

C 100.100.100.3/32 is directly connected, Loopback3

C 100.100.100.4/32 is directly connected, Loopback4

C 100.100.100.5/32 is directly connected, Loopback5

C 100.100.100.6/32 is directly connected, Loopback6

C 100.100.100.7/32 is directly connected, Loopback7

Pada OSPF, discard route akan otomatis muncul bila summary route dikonfigurasikan. Hal tersebut untuk menghindari terjadinya adanya forwarding loop, bila ingin dihapuskan, maka konfigurasikan berikut.

R1:

R1(config)#router ospf 1

R1(config-router)#no discard-route

R1(config-router)#ex

R1:

R1(config)#do sh ip route

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 IA 2.2.2.2 [110/2] via 12.12.12.2, 00:17:40, FastEthernet0/0

3.0.0.0/32 is subnetted, 1 subnets

O IA 3.3.3.3 [110/3] via 12.12.12.2, 00:17:40, FastEthernet0/0

12.0.0.0/8 is variably subnetted, 2 subnets, 2 masks

C 12.12.12.0/24 is directly connected, FastEthernet0/0

L 12.12.12.1/32 is directly connected, FastEthernet0/0

23.0.0.0/24 is subnetted, 1 subnets

O IA 23.23.23.0 [110/2] via 12.12.12.2, 00:17:40, FastEthernet0/0

33.0.0.0/32 is subnetted, 3 subnets

O E1 33.33.33.1 [110/22] via 12.12.12.2, 00:17:40, FastEthernet0/0

O E1 33.33.33.2 [110/22] via 12.12.12.2, 00:17:40, FastEthernet0/0

O E1 33.33.33.3 [110/22] via 12.12.12.2, 00:17:40, FastEthernet0/0

100.0.0.0/32 is subnetted, 7 subnets

C 100.100.100.1 is directly connected, Loopback1

C 100.100.100.2 is directly connected, Loopback2

C 100.100.100.3 is directly connected, Loopback3

C 100.100.100.4 is directly connected, Loopback4

C 100.100.100.5 is directly connected, Loopback5

C 100.100.100.6 is directly connected, Loopback6

C 100.100.100.7 is directly connected, Loopback7

Dan discard route null0 pun sudah di tiadakan.