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OSPF Not So Stubby Area

 

OSPF Not So Stubby Area




 • 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 ( CUSTOM )

• Dan bila diinginkan Internal Route OSPF dari area lain masih bisa diterima, maka solusinya juga menggunakan NSSA.

• Dikonfigurasikan pada semua router pada area stub 



KONFIG

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 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 diterimaDI STUB ROUTER 3


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


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 ABR nya

saja yakni dalam hal ini 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


sekarang kita akan coba tes ping 


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:

CCNP ENTERPRISE | SMK IDN BOARDING SCHOOL 103

!!!!!

Success rate is 100 percent (5/5), round-trip min/avg/max = 20/29/36 ms




R2

R2(config)#router ospf 2

R2(config-router)#area 1 nssa no-summary

R2(config-router)#exit

R2(config)#


maka pada R3 sudah tidak lagi terdapat routing inter area dan digantikan

dengan default route saja


R3

R3(config)#do sh ip route ospf

Gateway of last resort is 23.23.23.2 to network 0.0.0.0

O*IA 0.0.0.0/0 [110/2] via 23.23.23.2, 00:01:54, GigabitEthernet1/0

 2.0.0.0/32 is subnetted, 1 subnets

O 2.2.2.2 [110/2] via 23.23.23.2, 00:40:26, GigabitEthernet1/0


TEST PING

R3

R3(config)#do ping 100.100.100.1

Type escape sequence to abort.

Sending 5, 100-byte ICMP Echos to 100.100.100.1, timeout is 2 seconds:

!!!!!

Success rate is 100 percent (5/5), round-trip min/avg/max = 20/24/32 ms


R3(config)#do ping 100.100.100.2

Type escape sequence to abort.

Sending 5, 100-byte ICMP Echos to 100.100.100.2, timeout is 2 seconds:

!!!!!

Success rate is 100 percent (5/5), round-trip min/avg/max = 28/32/36 ms


R3(config)#do ping 100.100.100.3

Type escape sequence to abort.

Sending 5, 100-byte ICMP Echos to 100.100.100.3, timeout is 2 seconds:

!!!!!

Success rate is 100 percent (5/5), round-trip min/avg/max = 32/33/40 ms


R3(config)#do ping 100.100.100.4

CCNP ENTERPRISE | SMK IDN BOARDING SCHOOL 104

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 = 24/32/36 ms


R3(config)#do 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 = 20/30/36 ms


R3(config)#do 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 = 24/37/56 ms


R3(config)#do 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 = 20/24/36 ms


Dan pastikan 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


Tes ping ke semua network 33.33.33.1/32,.


R1

R1(config)#do ping 33.33.33.1

Type escape sequence to abort.

Sending 5, 100-byte ICMP Echos to 33.33.33.1, timeout is 2 seconds:

!!!!!

Success rate is 100 percent (5/5), round-trip min/avg/max = 20/35/56 ms

SELESAI


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