Basic OSPF can be enabled on the router with one line of configuration, and then by adding the network statement that specifies on which interfaces you want to run OSPF, not necessarily networks you wish to advertise:
- Router ospf 9 ← locally significant number
- network 10.0.0.0 0.255.255.255 area 0
OSPF won’t become active until at least one interface is up/up, and remember that at least one area must be Area 0. A Sample OSPF network is illustrated in Figure 39.14 below: