Lab 3. Eigrp Filtering Prefix List – In

Tujuan dari lab ini adalah memfilter paket berdasarkan netmask-nya menggunakan prefix-list. Contohnya adalah network di R3 dengan prefix /24-28 akan di blokir dan yang lainnya akan tetap di tampilkan. Konfigurasi ip address dan routing eigrp seperti lab sebelumnya, jika sudah langsung saja buat interface loopback di R3.

*R3

  •  R3(config)#int fa 1/0
  •  R3(config-if)#ip add 23.23.23.2 255.255.255.0
  •  R3(config-if)#no shutdown
  •  R3(config)#int loopback 0
  •  R3(config-if)#ip add 3.3.3.3 255.255.255.255
  •  R3(config-if)#int loopback 1
  •  R3(config-if)#ip add 3.3.3.17 255.255.255.240
  •  R3(config-if)#int loopback 2
  •  R3(config-if)#ip add 3.3.3.33 255.255.255.248
  •  R3(config-if)#int loopback 3
  •  R3(config-if)#ip add 3.3.3.100 255.255.255.224
  •  R3(config-if)#int loopback 4
  •  R3(config-if)#ip add 3.3.3.150 255.255.255.252
  •  R3(config-if)#int loopback 5
  •  R3(config-if)#ip add 3.3.3.200 255.255.255.240
  •  R3(config)#router eigrp 10
  •  R3(config-router)#network 0.0.0.0
  •  R3(config-router)#no auto-summary

Coba cek table routing di R1 dan R2

*R1

  •  R1(config-router)#do sh ip route

       3.0.0.0/8 is variably subnetted, 6 subnets, 5 masks

 D        3.3.3.3/32 [90/158720] via 12.12.12.2, 00:10:42, FastEthernet0/0

 D        3.3.3.16/28 [90/158720] via 12.12.12.2, 00:10:42, FastEthernet0/0

 D        3.3.3.32/29 [90/158720] via 12.12.12.2, 00:10:42, FastEthernet0/0

 D        3.3.3.96/27 [90/158720] via 12.12.12.2, 00:10:42, FastEthernet0/0

 D        3.3.3.148/30 [90/158720] via 12.12.12.2, 00:10:42, FastEthernet0/0

 D        3.3.3.192/28 [90/158720] via 12.12.12.2, 00:10:42, 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

 D        23.23.23.0 [90/30720] via 12.12.12.2, 00:17:46, FastEthernet0/0

*R2

  •  R2(config)#do sh ip route

       3.0.0.0/8 is variably subnetted, 6 subnets, 5 masks

 D        3.3.3.3/32 [90/156160] via 23.23.23.2, 00:15:54, FastEthernet1/0

 D        3.3.3.16/28 [90/156160] via 23.23.23.2, 00:15:54, FastEthernet1/0

 D        3.3.3.32/29 [90/156160] via 23.23.23.2, 00:15:54, FastEthernet1/0

 D        3.3.3.96/27 [90/156160] via 23.23.23.2, 00:15:54, FastEthernet1/0

 D        3.3.3.148/30 [90/156160] via 23.23.23.2, 00:15:54, FastEthernet1/0

 D        3.3.3.192/28 [90/156160] via 23.23.23.2, 00:15:54, FastEthernet1/0

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

 C        12.12.12.0/24 is directly connected, FastEthernet0/0

 L        12.12.12.2/32 is directly connected, FastEthernet0/0

       23.0.0.0/8 is variably subnetted, 2 subnets, 2 masks

 C        23.23.23.0/24 is directly connected, FastEthernet1/0

 L        23.23.23.1/32 is directly connected, FastEthernet1/0

Sekarang kita konfigurasi prefix-list filtering pada R2

*R2

  •  R2(config)#ip prefix-list EIGRP_IN seq 10 deny 3.3.3.0/24 le 28
  •  R2(config)#ip prefix-list EIGRP_IN seq 20 permit 0.0.0.0/0 le 32
  •  R2(config)#router eigrp 10
  •  R2(config-router)#distribute-list prefix EIGRP_IN in

Cek lagi table routing-nya. Bisa dipastikan bahwa network 3.3.3.x dengan prefix antara /24 sampai /28 sudah tidak ada.

*R1

  •  R1(config)#do sh ip route

       3.0.0.0/8 is variably subnetted, 3 subnets, 3 masks

 D        3.3.3.3/32 [90/158720] via 12.12.12.2, 00:37:48, FastEthernet0/0

 D        3.3.3.32/29 [90/158720] via 12.12.12.2, 00:37:48, FastEthernet0/0

 D        3.3.3.148/30 [90/158720] via 12.12.12.2, 00:37:48, 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  D       

23.23.23.0 [90/30720] via 12.12.12.2, 00:44:52, FastEthernet0/0

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