IP OSPF Command on CISCO Router/Switch

Command

IP OSPF #

Use

Enables OSPF on an interface.

Syntax

Router(config-if)#ip ospf <Number>

Example

In this example, OSPF is enabled on int fa0/0 on R1. Before doing so, ospf is disabled at the router level on R1. The empty route table
is first displayed.

R1(config)#no router ospf 1
R1(config)#do show ip route ospf

R1(config)#

After that, ospf is then enabled directly on fa0/0.

R1(config)#int fa0/0
R1(config-if)#ip ospf 1 area 0

Finally, the route table is displayed.

R1(config-if)#do show ip route ospf
2.0.0.0/32 is subnetted, 1 subnets
O 2.2.2.2 [110/2] via 10.1.1.2, 00:00:13, FastEthernet0/0
33.0.0.0/32 is subnetted, 1 subnets
O 33.33.33.33 [110/3] via 10.1.1.2, 00:00:13, FastEthernet0/0
3.0.0.0/32 is subnetted, 1 subnets
O 3.3.3.3 [110/3] via 10.1.1.2, 00:00:13, FastEthernet0/0
10.0.0.0/24 is subnetted, 3 subnets
O 10.2.2.0 [110/2] via 10.1.1.2, 00:00:13, FastEthernet0/0
133.133.0.0/32 is subnetted, 1 subnets
O 133.133.133.133 [110/3] via 10.1.1.2, 00:00:13, FastEthernet0/0

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