Lab 7. OSPF External Route Tipe-1

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• Routing yang berasal dari routing protocol lain diberikan label dalam tabel routing dengan label “OE2” yang berarti merupakan hasil redistribute dengan menggunakan metric type 2.

• Redistribute pada OSPF ada 2 macam, yaitu redistribute metric type 1 dan redistribute metric type 2.

• Perbedaan keduanya terletak pada cost yang akna diberikan kepada setiap network hasil redistribute tersebut.

• Redistribute type 1 akan memberikan cost pada sebuah network yang merupakan hasil penjumlahan cost internal dan juga cost external.

• Sedangkan, redistribute type 2 akan memberikan cost pada sebuah network hanya cost external dan tidak memperdulikan cost internal.

Kita masih menggunkan lab sebelumnya jadi pertama kita hapus konfig NSSA pada R2 dan R2.

R2:
R2(config)#router ospf 2
R2(config-router)#no area 1 nssa no-summary
R2(config-router)#no area 1 nssa
R2(config-router)#exit

R3:
R3(config)#router ospf 3
R3(config-router)#no area 1 nssa
R3(config-router)#exit

Kondisi awal tabel routing :
R1:
R1(config)#do sh ip route ospf
    2.0.0.0/32 is subnetted, 1 subnets
O IA 2.2.2.2 [110/2] via 12.12.12.2, 09:49:43, FastEthernet0/0
    3.0.0.0/32 is subnetted, 1 subnets
O IA 3.3.3.3 [110/3] via 12.12.12.2, 00:02:37, FastEthernet0/0
    23.0.0.0/24 is subnetted, 1 subnets
O IA 23.23.23.0 [110/2] via 12.12.12.2, 00:02:37, FastEthernet0/0
    33.0.0.0/32 is subnetted, 3 subnets
O E2 33.33.33.1 [110/20] via 12.12.12.2, 00:02:32, FastEthernet0/0
O E2 33.33.33.2 [110/20] via 12.12.12.2, 00:02:32, FastEthernet0/0
O E2 33.33.33.3 [110/20] via 12.12.12.2, 00:02:32, FastEthernet0/0

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, 00:21:32, FastEthernet0/0
    3.0.0.0/32 is subnetted, 1 subnets
O 3.3.3.3 [110/2] via 23.23.23.3, 00:20:56, GigabitEthernet1/0
    33.0.0.0/32 is subnetted, 3 subnets
O E2 33.33.33.1 [110/20] via 23.23.23.3, 00:20:56, GigabitEthernet1/0
O E2 33.33.33.2 [110/20] via 23.23.23.3, 00:20:56, GigabitEthernet1/0
O E2 33.33.33.3 [110/20] via 23.23.23.3, 00:20:56, GigabitEthernet1/0
    100.0.0.0/32 is subnetted, 7 subnets
O IA 100.100.100.1 [110/2] via 12.12.12.1, 00:21:32, FastEthernet0/0
O IA 100.100.100.2 [110/2] via 12.12.12.1, 00:21:32, FastEthernet0/0
O IA 100.100.100.3 [110/2] via 12.12.12.1, 00:21:32, FastEthernet0/0
O E2 100.100.100.4 [110/20] via 12.12.12.1, 00:21:32, FastEthernet0/0
O E2 100.100.100.5 [110/20] via 12.12.12.1, 00:21:32, FastEthernet0/0
O E2 100.100.100.6 [110/20] via 12.12.12.1, 00:21:32, FastEthernet0/0
O E2 100.100.100.7 [110/20] via 12.12.12.1, 00:21:32, FastEthernet0/0

Perhatikan Code E2 pada tabel routing di R1 dan R2 diatas. Dan perhatikan bagian [110/20], 110 menunjukkan administrator distance OSPF, sedangkan 20 menunjukkan metric yang digunakan oleh R2 menuju network tersebut. Metricnya sama baik ketika route tersebut di R1 ataupun R2. Selanjutnya kita ubah agar menjadi External Type 1 gunakan salah satu cara saja ya.

R3 (Cara Pertama):
R3(config)#router ospf 3
R3(config-router)#redistribute rip subnets metric-type ?
1 Set OSPF External Type 1 metrics
2 Set OSPF External Type 2 metrics
R3(config-router)#redistribute rip subnets metric-type 1
R3(config-router)#exit

R3: (Cara Kedua):
R3(config)#route-map TIPE-SATU
R3(config-route-map)#set metric-type ?
external IS-IS external metric
internal IS-IS internal metric or Use IGP metric as the MED for BGP
type-1 OSPF external type 1 metric
type-2 OSPF external type 2 metric
R3(config-route-map)#set metric-type type-1
R3(config-route-map)#exit
R3(config)#
R3(config)#router ospf 3
R3(config-router)#redistribute rip subnets route-map TIPE-SATU
R3(config-router)#exit

R1:
R1(config)#do sh ip route ospf
    2.0.0.0/32 is subnetted, 1 subnets
O IA 2.2.2.2 [110/2] via 12.12.12.2, 10:49:50, FastEthernet0/0
    3.0.0.0/32 is subnetted, 1 subnets
O IA 3.3.3.3 [110/3] via 12.12.12.2, 01:02:44, FastEthernet0/0
    23.0.0.0/24 is subnetted, 1 subnets
O IA 23.23.23.0 [110/2] via 12.12.12.2, 01:02:44, FastEthernet0/0
    33.0.0.0/32 is subnetted, 3 subnets
O E1 33.33.33.1 [110/22] via 12.12.12.2, 00:02:50, FastEthernet0/0
O E1 33.33.33.2 [110/22] via 12.12.12.2, 00:02:50, FastEthernet0/0
O E1 33.33.33.3 [110/22] via 12.12.12.2, 00:02:50, FastEthernet0/0

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, 01:09:19, FastEthernet0/0
3.0.0.0/32 is subnetted, 1 subnets
O 3.3.3.3 [110/2] via 23.23.23.3, 01:08:43, GigabitEthernet1/0
33.0.0.0/32 is subnetted, 3 subnets
O E1 33.33.33.1 [110/21] via 23.23.23.3, 00:08:49, GigabitEthernet1/0
O E1 33.33.33.2 [110/21] via 23.23.23.3, 00:08:49, GigabitEthernet1/0
O E1 33.33.33.3 [110/21] via 23.23.23.3, 00:08:49, GigabitEthernet1/0

Terlihat bahwa code Route nya berubah menjadi E1 dan nilai Metric nya berubah dan berbeda pada setiap Router.

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