Configuration:
- Enable Globally
- ‘router ospf <process id>’
- Network statements with IPs/wildcard masks
- ‘network 0.0.0.0 0.0.0.0 area <area #>
- Enable Under Interface
- ‘ip ospf <process id> area <area #>
- If a manual router ID is needed, needs to be entered under the ‘router ospf <process id>’ configuration.
- This enables OSPF for both primary and secondary IP addresses.
- OSPF stays enabled even when IP address changes.
- Verification basics:
- ‘show ip ospf’
- ‘show ip ospf int brief’
- Quick way of showing which interfaces are enabled, which area each interface is in.
- ‘show ip ospf neighbor
- ‘debug ip ospf adjacency’
- ‘show ip ospf database’
Below there are two routers running OSPF.
R2:
– Gig0/0 – 10.30.1.2 255.255.255.252
– L0 – 10.30.2.1 255.255.255.0
– L2 – 10.30.3.1 255.255.255.0
R1:
– Gig0/0 – 10.30.1.1 255.255.255.252
– L0 – 172.16.1.1 255.255.255.0
– L1 – 172.16.2.1 255.255.255.0
R1 OSPF Config:
R2 OSPF Config:
R1 Verification/Routing Table:
R2 Verification/Routing Table:
