Assigning interfaces to an area

Once you define OSPFv2 areas, you can assign interfaces to the areas. All device ports must be assigned to one of the defined areas on an OSPFv2 device. When a port is assigned to an area, all corresponding subnets on that port are automatically included in the assignment.

About this task

To assign a loopback interface to an area with the IP address of 10.5.0.0, perform the following task:

Procedure

Enter the configure terminal command to access global configuration mode.
```
device# configure terminal
```
Enter the interface command and specify an interface.
```
device(config)# interface loopback 2
```
Enter the ip ospf area command followed by the IP address of the area.
```
device(config-Loopback-2)# ip ospf area 10.5.0.0
```

Example

The following example assigns a loopback interface to an area with the IP address of 10.5.0.0.

device# configure terminal
device(config)# interface loopback 2
device(config-Loopback-2)# ip ospf area 10.5.0.0