syarat dari ospf tuh khan semua area harus terhubung ke area 0, nah pada gambar di atas, area 0 itu cuman loopbacknya aja. okelah area 1 sudah terhubung ke area 0, tapi bagaimana dengan area 2 dan area 3?
Pada area 2 agar bisa terhubung ke area 0 itu harus kita buat virtual linknya . tapi sebelum ngelab virtual link, kita bikin preconfignya dulu ya :
konfigurasi :
R1
conf t
int l0
ip add 1.1.1.1 255.255.255.255
int f0/0
ip add 12.12.12.1 255.255.255.0
no sh
router ospf 1
network 1.1.1.1 0.0.0.0 area 0
network 12.12.12.1 0.0.0.0 area 1
R2
conf t
int l0
ip add 2.2.2.2 255.255.255.255
int f0/0
ip add 12.12.12.2 255.255.255.0
no sh
int s0/0
ip add 23.23.23.2 255.255.255.0
no sh
router ospf 2
network 2.2.2.2 0.0.0.0 area 1
network 12.12.12.2 0.0.0.0 area 1
network 23.23.23.2 0.0.0.0 area 2
R3
conf t
int l0
ip add 3.3.3.3 255.255.255.255
int s0/0
ip add 23.23.23.3 255.255.255.255
no sh
router ospf 3
network 23.23.23.3 0.0.0.0 area 2
network 3.3.3.3 0.0.0.0 area 3
untuk membuat virtual link, dari area 2 ke area 0, kita harus tentukan , dia tuh di lewatin area berapa? nah disini area 2 mau ke area 0 itu melewati area 1, jadi gini cara bikin virtual link di R2
conf t
router ospf 2
area 1 virtual-link 1.1.1.1 ======> ini router ID dari R1
Konfigurasi R1
router ospf 1
area 1 virtual-link 2.2.2.2 =======> ini router ID dari R2
Sekarang bagaimana untuk membuat virtual link dari area 3 ke area 0? nah disini khan sudah ada virtual link antara R1dan R2, maka seolah-olah di R2 sudah ada area 0, jadi si R3 (area 3) bikin virtual link aja ke R2 (lewat area2), gak usah ke R1 langsung, berikut caranya :
Konfigurasi R2 :
conf t
router ospf 2
area 2 virtual-link 3.3.3.3
Konfigurasi R3 :
conf t
router ospf 3
area 2 virtual -link 2.2.2.2
sekarang pengecheckan standar, show ip route di semua router, terus test ping.
nah untuk check virtual-link nya berikut command nya :
R3#sh ip ospf virtual-links
Virtual Link OSPF_VL0 to router 2.2.2.2 is up
Run as demand circuit
DoNotAge LSA allowed.
Transit area 2, via interface Serial0/0, Cost of using 64
Transmit Delay is 1 sec, State POINT_TO_POINT,
Timer intervals configured, Hello 10, Dead 40, Wait 40, Retransmit 5
Hello due in 00:00:05
Adjacency State FULL (Hello suppressed)
Index 1/2, retransmission queue length 0, number of retransmission 0
First 0x0(0)/0x0(0) Next 0x0(0)/0x0(0)
Last retransmission scan length is 0, maximum is 0
Last retransmission scan time is 0 msec, maximum is 0 msec
R2(config-router)#do sh ip ospf virtual
Virtual Link OSPF_VL1 to router 3.3.3.3 is up
Run as demand circuit
DoNotAge LSA allowed.
Transit area 2, via interface Serial0/0, Cost of using 64
Transmit Delay is 1 sec, State POINT_TO_POINT,
Timer intervals configured, Hello 10, Dead 40, Wait 40, Retransmit 5
Hello due in 00:00:06
Adjacency State FULL (Hello suppressed)
Index 2/4, retransmission queue length 0, number of retransmission 0
First 0x0(0)/0x0(0) Next 0x0(0)/0x0(0)
Last retransmission scan length is 0, maximum is 0
Last retransmission scan time is 0 msec, maximum is 0 msec
Virtual Link OSPF_VL0 to router 1.1.1.1 is up
Run as demand circuit
DoNotAge LSA allowed.
Transit area 1, via interface FastEthernet0/0, Cost of using 10
Transmit Delay is 1 sec, State POINT_TO_POINT,
Timer intervals configured, Hello 10, Dead 40, Wait 40, Retransmit 5
Hello due in 00:00:07
Adjacency State FULL (Hello suppressed)
Index 1/3, retransmission queue length 0, number of retransmission 1
First 0x0(0)/0x0(0) Next 0x0(0)/0x0(0)
Last retransmission scan length is 1, maximum is 1
Last retransmission scan time is 0 msec, maximum is 0 msec
R2(config-router)#
dah itu aja deh, semoga bermanfaat
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