OSPF Lab 6 : OSPF Not So Stubby Area

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 LAB 6


• Seperti stub area tapi masih bisa sedikit diubah 
• Kalau pada stub dan totally stub area, maka External route benar-benar tidak diterima ataupun                    dikirimkan, nah bila diinginkan pada area stub masih bisa mengirim external route maka solusinya              menggunakan NSSA. 
• Namun External Route ini tidak sebagai LSA Type 5, melainkan dalam bentuk LSA Type 7, karena             memang LSA Type 3,4,5 benar – benar dibatasi pada stub area jadi alternatifnya diakali menggunakan       LSA Type 7 
• Dan bila diinginkan Internal Route OSPF dari area lain masih bisa diterima, maka solusinya juga                menggunakan NSSA. 
• Dikonfigurasikan pada semua router pada area stub

Tambahkan dulu routing external RIP yang diredistribute ke OSPF di router R3 area stub.

R3
R3(config)#int lo1 
R3(config-if)#ip add 33.33.33.1 255.255.255.255 

R3(config-if)#int lo2 
R3(config-if)#ip add 33.33.33.2 255.255.255.255

R3(config-if)#int lo3 
R3(config-if)#ip add 33.33.33.3 255.255.255.255 

R3(config)#router rip 
R3(config-router)#version 2 
R3(config-router)#network 33.33.33.0 
R3(config-router)#no auto-summary

R3(config)#router ospf 3 
R3(config-router)#redistribute rip subnets

Selanjutnya Konfigurasikan NSSA, dengan menghapus area 1 stub pada sebelum nya

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

R3
R3(config-router)#no area 1 stub 
R3(config-router)#area 1 nssa 
R3(config-router)#exit

Cek kembali routing table nya,.

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, 00:00:28, GigabitEthernet1/0 
 2.0.0.0/32 is subnetted, 1 subnets 
O 2.2.2.2 [110/2] via 23.23.23.2, 00:00:28, GigabitEthernet1/0 
 12.0.0.0/24 is subnetted, 1 subnets 
O IA 12.12.12.0 [110/2] via 23.23.23.2, 00:00:28, GigabitEthernet1/0 
 100.0.0.0/32 is subnetted, 3 subnets 
O IA 100.100.100.1 [110/3] via 23.23.23.2, 00:00:28, GigabitEthernet1/0 
O IA 100.100.100.2 [110/3] via 23.23.23.2, 00:00:28, GigabitEthernet1/0 
O IA 100.100.100.3 [110/3] via 23.23.23.2, 00:00:28, GigabitEthernet1/0

Internal Area dari OSPF Area 100 bisa diterima dengan baik di stub router R3.

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, 06:10:11, FastEthernet0/0 
 3.0.0.0/32 is subnetted, 1 subnets 
O IA 3.3.3.3 [110/3] via 12.12.12.2, 00:02:48, FastEthernet0/0 
 23.0.0.0/24 is subnetted, 1 subnets 
O IA 23.23.23.0 [110/2] via 12.12.12.2, 00:02:48, FastEthernet0/0 
 33.0.0.0/32 is subnetted, 3 subnets 
O E2 33.33.33.1 [110/20] via 12.12.12.2, 00:02:47, FastEthernet0/0 
O E2 33.33.33.2 [110/20] via 12.12.12.2, 00:02:47, FastEthernet0/0 
O E2 33.33.33.3 [110/20] via 12.12.12.2, 00:02:47, FastEthernet0/0


External Route RIP dari R3 sudah bisa diterima di router R1. Meski demikian, kita harus memperhatikan jika belum ada default routenya, sehingga R3 belum bisa ping ke IP 100.100.100.4 – 100.100.100.7 yang merupakan network EIGRP di R1 yang di redistribute ke OSPF. 

R3
R3(config)#do ping 100.100.100.4 
Type escape sequence to abort. 
Sending 5, 100-byte ICMP Echos to 100.100.100.4, timeout is 2 seconds: 
..... 
Success rate is 0 percent (0/5) 

Maka kita perlu menambahkan konfigurasi berikut cukup pada router ABRnya saja yakni dalam Lab ini adalah router R2. 

R2
R2(config)#router ospf 2 
R2(config-router)#area 1 nssa default-information-originate 
R2(config-router)#exit

Selanjutnya cek kembali pada routing tabel nya pada R3.

R3
R3(config)#do sh ip route ospf 
O*N2 0.0.0.0/0 [110/1] via 23.23.23.2, 00:09:06, GigabitEthernet1/0 
 1.0.0.0/32 is subnetted, 1 subnets 
O IA 1.1.1.1 [110/3] via 23.23.23.2, 00:23:13, GigabitEthernet1/0 
 2.0.0.0/32 is subnetted, 1 subnets 
O 2.2.2.2 [110/2] via 23.23.23.2, 00:23:13, GigabitEthernet1/0 
 12.0.0.0/24 is subnetted, 1 subnets 
O IA 12.12.12.0 [110/2] via 23.23.23.2, 00:23:13, GigabitEthernet1/0 
 100.0.0.0/32 is subnetted, 3 subnets 
O IA 100.100.100.1 [110/3] via 23.23.23.2, 00:23:13, GigabitEthernet1/0 
O IA 100.100.100.2 [110/3] via 23.23.23.2, 00:23:13, GigabitEthernet1/0 
O IA 100.100.100.3 [110/3] via 23.23.23.2, 00:23:13, GigabitEthernet1/0

Nah sekarang sudah muncul kan untuk default route (0.0.0.0/0) , sekarang kita akan coba tes ping kembali.

R3
R3#ping 100.100.100.4 
Type escape sequence to abort. 
Sending 5, 100-byte ICMP Echos to 100.100.100.4, timeout is 2 seconds: 
!!!!! 
Success rate is 100 percent (5/5), round-trip min/avg/max = 20/29/52 ms

R3#ping 100.100.100.5 
Type escape sequence to abort. 
Sending 5, 100-byte ICMP Echos to 100.100.100.5, timeout is 2 seconds: 
!!!!! 
Success rate is 100 percent (5/5), round-trip min/avg/max = 20/24/28 ms

R3#ping 100.100.100.6 
Type escape sequence to abort. 
Sending 5, 100-byte ICMP Echos to 100.100.100.6, timeout is 2 seconds: 
!!!!! 
Success rate is 100 percent (5/5), round-trip min/avg/max = 16/27/36 ms

R3#ping 100.100.100.7 
Type escape sequence to abort. 
Sending 5, 100-byte ICMP Echos to 100.100.100.7, timeout is 2 seconds: 
!!!!! 
Success rate is 100 percent (5/5), round-trip min/avg/max = 20/29/36 ms

Dan pastikan juga route external RIP dari R3 masih bisa di terima R1

R1
R1(config)#do sh ip route ospf 
Gateway of last resort is not set 
 2.0.0.0/32 is subnetted, 1 subnets 
O IA 2.2.2.2 [110/2] via 12.12.12.2, 07:15:08, FastEthernet0/0 
 3.0.0.0/32 is subnetted, 1 subnets 
O IA 3.3.3.3 [110/3] via 12.12.12.2, 01:07:45, FastEthernet0/0 
 23.0.0.0/24 is subnetted, 1 subnets 
O IA 23.23.23.0 [110/2] via 12.12.12.2, 01:07:45, FastEthernet0/0 
 33.0.0.0/32 is subnetted, 3 subnets 
O E2 33.33.33.1 [110/20] via 12.12.12.2, 01:07:44, FastEthernet0/0 
O E2 33.33.33.2 [110/20] via 12.12.12.2, 01:07:44, FastEthernet0/0 
O E2 33.33.33.3 [110/20] via 12.12.12.2, 01:07:44, FastEthernet0/0 

Dan lakukan ping dari R1 ke semua network (33.33.33.1-3/32).


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