OSPF Lab 10 : OSPF Sumarization – External Route

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 LAB 10


OSPF External Route Summarization, pada konfig sebelumnya pada R3 ada beberapa network yang sudah diadvertise ke RIP dan kemudian di redistribute. Dan ini berarti R3 sudah menjadi ASBR karena menjembatani area 0 dengan routing protocol lain. 

R3

R3(config)#do sh run | section rip 
redistribute rip metric-type 1 subnets 
router rip 
version 2 
network 33.0.0.0 
no auto-summary

R3(config)#do sh run | section ospf 
router ospf 3 
router-id 3.3.3.3 
redistribute rip metric-type 1 subnets 
network 3.3.3.3 0.0.0.0 area 1 
network 23.23.23.3 0.0.0.0 area 1

Cek routing tabel R1

R1

R1(config)#do sh ip route ospf 
 2.0.0.0/32 is subnetted, 1 subnets 
O IA 2.2.2.2 [110/2] via 12.12.12.2, 00:53:12, FastEthernet0/0 
 3.0.0.0/32 is subnetted, 1 subnets 
O IA 3.3.3.3 [110/3] via 12.12.12.2, 00:53:12, FastEthernet0/0 
 23.0.0.0/24 is subnetted, 1 subnets 
O IA 23.23.23.0 [110/2] via 12.12.12.2, 00:53:12, FastEthernet0/0 
 33.0.0.0/32 is subnetted, 3 subnets 
O E1 33.33.33.1 [110/22] via 12.12.12.2, 00:53:12, FastEthernet0/0 
O E1 33.33.33.2 [110/22] via 12.12.12.2, 00:53:12, FastEthernet0/0 
O E1 33.33.33.3 [110/22] via 12.12.12.2, 00:53:12, FastEthernet0/0

 Konfigurasikan External Route Summarization di R3 

R3

R3(config)#router ospf 3 
R3(config-router)#summary-address 33.33.33.0 255.255.255.240 
R3(config-router)#exit

 Cek kembali di R1

R1

R1(config)#do sh ip route ospf 
 2.0.0.0/32 is subnetted, 1 subnets 
O IA 2.2.2.2 [110/2] via 12.12.12.2, 00:56:57, FastEthernet0/0 
 3.0.0.0/32 is subnetted, 1 subnets 
O IA 3.3.3.3 [110/3] via 12.12.12.2, 00:56:57, FastEthernet0/0 
 23.0.0.0/24 is subnetted, 1 subnets 
O IA 23.23.23.0 [110/2] via 12.12.12.2, 00:56:57, FastEthernet0/0 
 33.0.0.0/28 is subnetted, 1 subnets 
O E1 33.33.33.0 [110/22] via 12.12.12.2, 00:01:13, FastEthernet0/0

Sekarang kita cek di R3. 

R3

R3(config)#do sh ip route 
 1.0.0.0/32 is subnetted, 1 subnets 
O IA 1.1.1.1 [110/3] via 23.23.23.2, 06:58:11, GigabitEthernet1/0 
 2.0.0.0/32 is subnetted, 1 subnets 
O 2.2.2.2 [110/2] via 23.23.23.2, 06:58:11, GigabitEthernet1/0 
 3.0.0.0/32 is subnetted, 1 subnets 
C 3.3.3.3 is directly connected, Loopback0 
 12.0.0.0/24 is subnetted, 1 subnets 
O IA 12.12.12.0 [110/2] via 23.23.23.2, 06:58:11, GigabitEthernet1/0 
 23.0.0.0/8 is variably subnetted, 2 subnets, 2 masks 
C 23.23.23.0/24 is directly connected, GigabitEthernet1/0 
L 23.23.23.3/32 is directly connected, GigabitEthernet1/0 
 33.0.0.0/8 is variably subnetted, 4 subnets, 2 masks 
O 33.33.33.0/28 is a summary, 00:03:11, Null0 
C 33.33.33.1/32 is directly connected, Loopback1 
C 33.33.33.2/32 is directly connected, Loopback2 
C 33.33.33.3/32 is directly connected, Loopback3 
 100.0.0.0/8 is variably subnetted, 5 subnets, 2 masks 
O IA 100.100.100.0/29 [110/3] via 23.23.23.2, 02:20:00, GigabitEthernet1/0 
O E2 100.100.100.4/32 [110/20] via 23.23.23.2, 06:58:01, GigabitEthernet1/0 
O E2 100.100.100.5/32 [110/20] via 23.23.23.2, 06:58:01, GigabitEthernet1/0 
O E2 100.100.100.6/32 [110/20] via 23.23.23.2, 06:58:01, GigabitEthernet1/0 
O E2 100.100.100.7/32 [110/20] via 23.23.23.2, 06:58:01, GigabitEthernet1/0

Nah disitukan ada null0 lagi seperti sebelum nya, untuk menghapusnnya konfigurasi seperti ini :

R3

R3(config)#router ospf 3 
R3(config-router)#no discard-route 
R3(config-router)#exit

Cek kembali untuk R3

R3

R3(config)#do sh ip ro 
Gateway of last resort is not set 
 1.0.0.0/32 is subnetted, 1 subnets 
O IA 1.1.1.1 [110/3] via 23.23.23.2, 00:01:03, GigabitEthernet1/0 
 2.0.0.0/32 is subnetted, 1 subnets 
O 2.2.2.2 [110/2] via 23.23.23.2, 00:01:03, GigabitEthernet1/0 
 3.0.0.0/32 is subnetted, 1 subnets 
C 3.3.3.3 is directly connected, Loopback0 
 12.0.0.0/24 is subnetted, 1 subnets 
O IA 12.12.12.0 [110/2] via 23.23.23.2, 00:01:03, GigabitEthernet1/0 
 23.0.0.0/8 is variably subnetted, 2 subnets, 2 masks 
C 23.23.23.0/24 is directly connected, GigabitEthernet1/0 
L 23.23.23.3/32 is directly connected, GigabitEthernet1/0 
 33.0.0.0/32 is subnetted, 3 subnets 
C 33.33.33.1 is directly connected, Loopback1 
C 33.33.33.2 is directly connected, Loopback2 
C 33.33.33.3 is directly connected, Loopback3 
 100.0.0.0/8 is variably subnetted, 5 subnets, 2 masks 
O IA 100.100.100.0/29 [110/3] via 23.23.23.2, 00:01:03, GigabitEthernet1/0 
O E2 100.100.100.4/32 [110/20] via 23.23.23.2, 00:01:03, GigabitEthernet1/0
O E2 100.100.100.5/32 [110/20] via 23.23.23.2, 00:01:03, GigabitEthernet1/0
O E2 100.100.100.6/32 [110/20] via 23.23.23.2, 00:01:03, GigabitEthernet1/0 
O E2 100.100.100.7/32 [110/20] via 23.23.23.2, 00:01:03, GigabitEthernet1/0 

Lalu test ping untuk memastikan jalurnya tetap terhubung     

R1

R1(config)#do ping 33.33.33.1 
Type escape sequence to abort. 
Sending 5, 100-byte ICMP Echos to 33.33.33.1, timeout is 2 seconds: 
!!!!! 
Success rate is 100 percent (5/5), round-trip min/avg/max = 32/57/96 ms

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