Lab 13. OSPF - Filtering External Route

kali ini kita akan membatasi jumlah external route yang diredistribute ke ospf, beberapa ip loopback pada R1 akan kita jadikan external route. Pertama kita hapus settingan sebelumnya

R2(config)#router ospf 2
R2(config-router)#no distribute-list prefix PKLIDN in
R2(config-router)#no distance 255 0.0.0.0 255.255.255.255 2

Hapus network yang diadvertise kemudiain setting redistribute

R1(config)#router ospf 1
R1(config-router)#no network 10.10.10.0 0.0.0.255 area 1
R1(config-router)#redistribute connected subnets

Cek routing table di R2

R2(config)#do sh ip route
1.0.0.0/32 is subnetted, 1 subnets
O 1.1.1.1 [110/11] via 12.12.12.1, 00:01:19, Ethernet0/0
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
O 3.3.3.3 [110/11] via 23.23.23.3, 00:01:19, Ethernet0/1
10.0.0.0/32 is subnetted, 6 subnets
O E2 10.10.10.1 [110/20] via 12.12.12.1, 00:01:19, Ethernet0/0
O E2 10.10.10.2 [110/20] via 12.12.12.1, 00:01:19, Ethernet0/0
O E2 10.10.10.3 [110/20] via 12.12.12.1, 00:01:19, Ethernet0/0
O E2 10.10.10.4 [110/20] via 12.12.12.1, 00:01:19, Ethernet0/0
O E2 10.10.10.5 [110/20] via 12.12.12.1, 00:01:19, Ethernet0/0
O E2 10.10.10.6 [110/20] via 12.12.12.1, 00:01:19, Ethernet0/0
12.0.0.0/8 is variably subnetted, 2 subnets, 2 masks
C12.12.12.0/24 is directly connected, Ethernet0/0
L12.12.12.2/32 is directly connected, Ethernet0/0
23.0.0.0/8 is variably subnetted, 2 subnets, 2 masks
C23.23.23.0/24 is directly connected, Ethernet0/1
L23.23.23.2/32 is directly connected, Ethernet0/1

external route sudah ada, sekarang kita akan membatasi jumlah prefix menjadi 3

R1(config)#router ospf 1
R1(config-router)#redistribute maximum-prefix 3 60

Sekarang kita lihat di R2 dan R3

R2(config)#do sh ip route
1.0.0.0/32 is subnetted, 1 subnets
O 1.1.1.1 [110/11] via 12.12.12.1, 00:02:59, Ethernet0/0
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
O 3.3.3.3 [110/11] via 23.23.23.3, 00:02:59, Ethernet0/1
10.0.0.0/32 is subnetted, 3 subnets
O E2 10.10.10.1 [110/20] via 12.12.12.1, 00:00:00, Ethernet0/0
O E2 10.10.10.2 [110/20] via 12.12.12.1, 00:00:00, Ethernet0/0
O E2 10.10.10.3 [110/20] via 12.12.12.1, 00:00:00, 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
L 12.12.12.2/32 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
L 23.23.23.2/32 is directly connected, Ethernet0/1

R3(config)#do sh ip route
1.0.0.0/32 is subnetted, 1 subnets
O 1.1.1.1 [110/21] via 23.23.23.2, 00:33:19, Ethernet0/0
2.0.0.0/32 is subnetted, 1 subnets
O 2.2.2.2 [110/11] via 23.23.23.2, 00:44:09, Ethernet0/0
3.0.0.0/32 is subnetted, 1 subnets
C 3.3.3.3 is directly connected, Loopback0
10.0.0.0/32 is subnetted, 3 subnets
O E2 10.10.10.1 [110/20] via 23.23.23.2, 00:02:29, Ethernet0/0
O E2 10.10.10.2 [110/20] via 23.23.23.2, 00:02:29, Ethernet0/0
O E2 10.10.10.3 [110/20] via 23.23.23.2, 00:02:29, Ethernet0/0
12.0.0.0/24 is subnetted, 1 subnets
O 12.12.12.0 [110/20] via 23.23.23.2, 00:33:19, 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
L 23.23.23.3/32 is directly connected, Ethernet0/0

Share this :