Day 2 - RIP - Filtering - Standar ACL

Filtering routing pada RIP bisa dilakukan beberapa cara, salah satunya adalah dengan menggunakan command distribute-list beserta access-list tentunya.

Lab kali ini kita akan membahas bagaimana cara konfigurasi filtering pada routing RIP menggunakan standart ACL.

Lab 6 - RIP - Filtering - Standar ACL

Topologi yang digunakan :


Skenario adalah sbb :
- Router R1 akan melakukan advertise semua IP Loopback ke arah routing RIP
- Router R2 akan melakukan filtering terhadap IP Loopback tertentu dari R1.


Konfigurasi R1:

interface Loopback0
 ip address 1.1.1.1 255.255.255.255
!
interface Loopback1
 ip address 10.0.0.1 255.255.255.255
!
interface Loopback2
 ip address 10.0.0.2 255.255.255.255
!
interface Loopback3
 ip address 10.0.0.3 255.255.255.255
!
interface Loopback4
 ip address 10.0.0.4 255.255.255.255
!
interface Loopback5
 ip address 10.0.0.5 255.255.255.255
!
interface Loopback6
 ip address 10.0.0.6 255.255.255.255
!
interface FastEthernet0/0
 ip address 12.12.12.1 255.255.255.0

!

router rip
 version 2
 network 1.0.0.0
 network 10.0.0.0
 network 11.0.0.0
 network 12.0.0.0
 no auto-summary

Konfigurasi R2 :

interface Loopback0
 ip address 2.2.2.2 255.255.255.255
!
interface FastEthernet0/0
 ip address 12.12.12.2 255.255.255.0
!
interface FastEthernet0/1
 ip address 23.23.23.2 255.255.255.0
!
router rip
 version 2
 network 2.0.0.0
 network 12.0.0.0
 network 23.0.0.0
 no auto-summary

Konfigurasi R3 :

interface Loopback0
 ip address 3.3.3.3 255.255.255.255
!
interface FastEthernet0/0
 ip address 23.23.23.3 255.255.255.0
!
router rip
 version 2
 network 3.0.0.0
 network 23.0.0.0
 no auto-summary

Kita cek routing table pada R2 :

R2(config-router)#do sh ip route

Gateway of last resort is not set

      2.0.0.0/32 is subnetted, 1 subnets
C       2.2.2.2 is directly connected, Loopback0
     3.0.0.0/32 is subnetted, 1 subnets
R       3.3.3.3 [120/1] via 23.23.23.3, 00:00:11, FastEthernet0/1
     23.0.0.0/24 is subnetted, 1 subnets
C       23.23.23.0 is directly connected, FastEthernet0/1
     10.0.0.0/32 is subnetted, 6 subnets
R       10.0.0.2 [120/1] via 12.12.12.1, 00:00:25, FastEthernet0/0
R       10.0.0.3 [120/1] via 12.12.12.1, 00:00:25, FastEthernet0/0
R       10.0.0.1 [120/1] via 12.12.12.1, 00:00:01, FastEthernet0/0
R       10.0.0.6 [120/1] via 12.12.12.1, 00:00:01, FastEthernet0/0
R       10.0.0.4 [120/1] via 12.12.12.1, 00:00:01, FastEthernet0/0
R       10.0.0.5 [120/1] via 12.12.12.1, 00:00:01, FastEthernet0/0
     12.0.0.0/24 is subnetted, 1 subnets
C       12.12.12.0 is directly connected, FastEthernet0/0

Selanjutnya kita akan coba melakukan filtering dari router R2 untuk IP Loopback R1 yang di advertise ke RIP difilter hanya yang genap saja yang boleh dilewatkan.

R2(config-router)#exit
R2(config)#access-list 1 permit 0.0.0.0 255.255.255.254

R2(config)#router rip
R2(config-router)#distribute-list 1 in fa0/0
R2(config-router)#do clear ip route *

Kita cek lagi routing table di R2 :

R2(config)#do sh ip route

Gateway of last resort is not set

     2.0.0.0/32 is subnetted, 1 subnets
C       2.2.2.2 is directly connected, Loopback0
     3.0.0.0/32 is subnetted, 1 subnets
R       3.3.3.3 [120/1] via 23.23.23.3, 00:00:01, FastEthernet0/1
     23.0.0.0/24 is subnetted, 1 subnets
C       23.23.23.0 is directly connected, FastEthernet0/1
     10.0.0.0/32 is subnetted, 3 subnets
R       10.0.0.2 [120/1] via 12.12.12.1, 00:00:01, FastEthernet0/0
R       10.0.0.6 [120/1] via 12.12.12.1, 00:00:01, FastEthernet0/0
R       10.0.0.4 [120/1] via 12.12.12.1, 00:00:03, FastEthernet0/0
     12.0.0.0/24 is subnetted, 1 subnets
C       12.12.12.0 is directly connected, FastEthernet0/0


Terlihat bahwa untuk routing table IP Loopback R1 yang diterima di R2 hanya menerima dari IP yang genap saja.


Kita coba balik, agar IP Loopback R1 yang diterima hanya yang ganjil saja.

R2(config)#no access-list 1
R2(config)#access-list 1 permit 0.0.0.1 255.255.255.254
R2(config)#do clear ip route *


Kita cek lagi routing table di R2 :

R2(config)#do sh ip route

Gateway of last resort is not set

     1.0.0.0/32 is subnetted, 1 subnets
R       1.1.1.1 [120/1] via 12.12.12.1, 00:00:02, FastEthernet0/0
     2.0.0.0/32 is subnetted, 1 subnets
C       2.2.2.2 is directly connected, Loopback0
     3.0.0.0/32 is subnetted, 1 subnets
R       3.3.3.3 [120/1] via 23.23.23.3, 00:00:02, FastEthernet0/1
     23.0.0.0/24 is subnetted, 1 subnets
C       23.23.23.0 is directly connected, FastEthernet0/1
     10.0.0.0/32 is subnetted, 3 subnets
R       10.0.0.3 [120/1] via 12.12.12.1, 00:00:02, FastEthernet0/0
R       10.0.0.1 [120/1] via 12.12.12.1, 00:00:04, FastEthernet0/0
R       10.0.0.5 [120/1] via 12.12.12.1, 00:00:04, FastEthernet0/0
     12.0.0.0/24 is subnetted, 1 subnets
C       12.12.12.0 is directly connected, FastEthernet0/0

Terlihat bahwa untuk IP Loopback R1 yang diterima di R2 hanya yang ganjil saja.

Sehingga untuk filtering menggunakan standar ACL dan distribute-list konfigurasinya sudah berjalan dengan baik :)