Lab — OSPF Single-Area — NetLab Academy

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Lab — OSPF Single-Area

3 router (R1, R2, R3) in Area 0 con 3 LAN. Configura OSPF, router-id, network wildcard, passive-interface, reference bandwidth. Verifica neighbor adjacency e routing.

3 Router — OSPF Area 0

🖥️ LAN A
192.168.1.0/24

—Gi0/0—

R1
RID: 1.1.1.1

—Gi0/1(.1|.2)—

R2
RID: 2.2.2.2

—Gi0/2(.5|.6)—

R3
RID: 3.3.3.3

—Gi0/0—

🖧 LAN C
192.168.3.0/24

R2 Gi0/0 → LAN B: 192.168.2.0/24

IP pre-configurati:
R1: Gi0/0=192.168.1.1/24, Gi0/1=10.0.0.1/30
R2: Gi0/0=192.168.2.1/24, Gi0/1=10.0.0.2/30, Gi0/2=10.0.0.5/30
R3: Gi0/0=192.168.3.1/24, Gi0/1=10.0.0.6/30

1Abilita OSPF su R1

router ospf 1
router-id 1.1.1.1
network 192.168.1.0 0.0.0.255 area 0
network 10.0.0.0 0.0.0.3 area 0

2Passive-interface su R1

passive-interface GigabitEthernet0/0
La LAN non ha router OSPF dall'altra parte.

3Stessa cosa su R2 e R3

R2: router-id 2.2.2.2, 3 network statements, passive Gi0/0
R3: router-id 3.3.3.3, 2 network statements, passive Gi0/0

4Reference bandwidth

auto-cost reference-bandwidth 10000
Su TUTTI i router! Dentro router ospf 1.

5Verifica

show ip ospf neighbor → Full
show ip route ospf → route O
ping 192.168.3.1 da R1

💡 Wildcard mask: /24 = 0.0.0.255, /30 = 0.0.0.3. Formula: 255.255.255.255 - subnet mask.

R1 — Console

R1>