EIGRP : Filtering Distribute-list

Singkatnya, kita disini hanya memfilter IP yang keluar atau masuk dari interface, fungsinya apa? ga laen dan ga bukan buat ngeringanin kerja router.

Untuk cara konfignya ada 2 macam, yang mana sebenernya sama aja, yang satu kita nolak dari router yang akan diringanin bebannya, yang satunya lagi kita nolak dari router yang mau ngirimin IP-nya ke si router yang mau diringanin, paham ga sih? yaudah biar agak paham langsung ke konfignya aja.

The Topology

*oiya, ini saya sudah konfig EIGRP.

R1(config-router)#do sh ip route

Gateway of last resort is not set

      1.0.0.0/32 is subnetted, 1 subnets
C        1.1.1.1 is directly connected, Loopback0
      2.0.0.0/32 is subnetted, 1 subnets
D        2.2.2.2 [90/156160] via 11.11.11.2, 00:05:00, FastEthernet0/0
      3.0.0.0/24 is subnetted, 1 subnets
D        3.3.3.0 [90/158720] via 11.11.11.2, 00:04:42, FastEthernet0/0
      11.0.0.0/8 is variably subnetted, 2 subnets, 2 masks
C        11.11.11.0/24 is directly connected, FastEthernet0/0
L        11.11.11.1/32 is directly connected, FastEthernet0/0
      22.0.0.0/24 is subnetted, 1 subnets
D        22.22.22.0 [90/30720] via 11.11.11.2, 00:04:53, FastEthernet0/0

Kita bakalan ngilangin atau ngefilter IP Loopback 2.2.2.2 ke Router 1.

Cara Pertama (in) :
Kita nge-filternya langsung di router 1, karena kita mau memfilter IP, berarti kita butuh yang namanya Access-list.

R1(config)#access-list 1 deny 2.2.2.2
R1(config)#access-list 1 permit any

Setelah itu kita Masukkin Access-listnya ke EIGRP pake metode Distribute-list.

R1(config)#router eigrp 10
R1(config-router)#distribute-list 1 in f0/0

Tunggu ada notif.

*Jun 25 16:27:41.151: %DUAL-5-NBRCHANGE: EIGRP-IPv4 10: Neighbor 11.11.11.2 (FastEthernet0/0) is resync: intf route configuration changed

Cek routing table.

R1(config-router)#do sh ip route

Gateway of last resort is not set

      1.0.0.0/32 is subnetted, 1 subnets
C        1.1.1.1 is directly connected, Loopback0
      3.0.0.0/24 is subnetted, 1 subnets
D        3.3.3.0 [90/158720] via 11.11.11.2, 00:04:46, FastEthernet0/0
      11.0.0.0/8 is variably subnetted, 2 subnets, 2 masks
C        11.11.11.0/24 is directly connected, FastEthernet0/0
L        11.11.11.1/32 is directly connected, FastEthernet0/0
      22.0.0.0/24 is subnetted, 1 subnets
D        22.22.22.0 [90/30720] via 11.11.11.2, 00:04:57, FastEthernet0/0

Done.

*oiya, kalo mau pake cara yang kedua, kita harus hapus distribute-list yang ada di router 1

Cara kedua (out) :
Kita ngefilternya lewat Router 2, jadi si Router 2 ngehalangin IP-nya biar ga ke Router 1. kita juga harus pake Access-list di Router 2.

R2(config)#access-list 1 deny 2.2.2.2
R2(config)#access-list 1 permit any

Masukkin Access-listnya ke EIGRP dengan metode Distribute-list. interfacenya kita pake yang mengarah ke router 1, karena tujuan awal IPnya out dari si router 2, jadi kita pake out.

R2(config)#router eigrp 10
R2(config-router)#distribute-list 1 out f0/0

tunggu notif dan cek routing tablenya di router 1

R1(config)#
*Jun 25 16:37:44.847: %DUAL-5-NBRCHANGE: EIGRP-IPv4 10: Neighbor 11.11.11.2 (FastEthernet0/0) is resync: peer graceful-restart

R1(config)#do sh ip route

Gateway of last resort is not set

      1.0.0.0/32 is subnetted, 1 subnets
C        1.1.1.1 is directly connected, Loopback0
      3.0.0.0/24 is subnetted, 1 subnets
D        3.3.3.0 [90/158720] via 11.11.11.2, 00:14:52, FastEthernet0/0
      11.0.0.0/8 is variably subnetted, 2 subnets, 2 masks
C        11.11.11.0/24 is directly connected, FastEthernet0/0
L        11.11.11.1/32 is directly connected, FastEthernet0/0
      22.0.0.0/24 is subnetted, 1 subnets
D        22.22.22.0 [90/30720] via 11.11.11.2, 00:15:03, FastEthernet0/0

Done.

Thanks a bunch for taking the time to read this! You’re freakin’ lit.