Lab 72 - OSPF Summarization Summary Address

Sebelumnya kita telah belajar melakukan OSPF Summarization pada ABR menggunakan area range. Selanjutnya pada lab ini kita akan belajar melakukan summarization pada ASBR menggunakan summary address. Berikut topologi yang akan kita gunakan pada lab ini

Gambar 1 Topologi jaringan RIP & OSPF

Diasumsikan kita telah mengkonfigurasi RIP dan OSPF seperti topologi diatas, jangan lupa untuk melakukan redistribution ya..

R2(config-router)#do sh ip ro
      11.0.0.0/32 is subnetted, 6 subnets
O E2     11.11.11.1 [110/20] via 12.12.12.1, 00:00:01, Ethernet0/0
O E2     11.11.11.2 [110/20] via 12.12.12.1, 00:00:18, Ethernet0/0
O E2     11.11.11.3 [110/20] via 12.12.12.1, 00:00:01, Ethernet0/0
O E2     11.11.11.4 [110/20] via 12.12.12.1, 00:00:18, Ethernet0/0
O E2     11.11.11.5 [110/20] via 12.12.12.1, 00:00:01, Ethernet0/0
O E2     11.11.11.6 [110/20] via 12.12.12.1, 00:00:18, Ethernet0/0
      12.0.0.0/8 is variably subnetted, 2 subnets, 2 masks
C        12.12.12.0/24 is directly connected, Ethernet0/0
      23.0.0.0/8 is variably subnetted, 2 subnets, 2 masks
C        23.23.23.0/24 is directly connected, Ethernet0/1

R3(config-router)#do sh ip ro

      11.0.0.0/32 is subnetted, 6 subnets
O E2     11.11.11.1 [110/20] via 23.23.23.2, 00:00:40, Ethernet0/0
O E2     11.11.11.2 [110/20] via 23.23.23.2, 00:01:12, Ethernet0/0
O E2     11.11.11.3 [110/20] via 23.23.23.2, 00:00:40, Ethernet0/0
O E2     11.11.11.4 [110/20] via 23.23.23.2, 00:01:12, Ethernet0/0
O E2     11.11.11.5 [110/20] via 23.23.23.2, 00:00:40, Ethernet0/0
O E2     11.11.11.6 [110/20] via 23.23.23.2, 00:01:12, Ethernet0/0
      12.0.0.0/24 is subnetted, 1 subnets
O        12.12.12.0 [110/20] via 23.23.23.2, 00:02:33, Ethernet0/0
      23.0.0.0/8 is variably subnetted, 2 subnets, 2 masks
C        23.23.23.0/24 is directly connected, Ethernet0/0

Sekarang kita lakukan summarization pada ASBR, dalam hal ini R1

R1(config)#router ospf 1
R1(config-router)#summary-address 11.11.11.0 255.255.255.248

Untuk pengujian kita coba lihat tabel routing di R2 dan R3

R2(config-router)#do sh ip ro

      11.0.0.0/29 is subnetted, 1 subnets
O E2     11.11.11.0 [110/20] via 12.12.12.1, 00:00:28, Ethernet0/0
      12.0.0.0/8 is variably subnetted, 2 subnets, 2 masks
C        12.12.12.0/24 is directly connected, Ethernet0/0
      23.0.0.0/8 is variably subnetted, 2 subnets, 2 masks
C        23.23.23.0/24 is directly connected, Ethernet0/1

R3(config-router)#do sh ip ro

      11.0.0.0/29 is subnetted, 1 subnets
O E2     11.11.11.0 [110/20] via 23.23.23.2, 00:00:53, Ethernet0/0
      12.0.0.0/24 is subnetted, 1 subnets
O        12.12.12.0 [110/20] via 23.23.23.2, 00:04:21, Ethernet0/0
      23.0.0.0/8 is variably subnetted, 2 subnets, 2 masks
C        23.23.23.0/24 is directly connected, Ethernet0/0

Perhatikan bahwa saat ini IP Loopback R1 sudah berhasil di summary menjadi satu route saja