Assigning OSPFv2 areas

Areas can be assigned as OSPFv2 areas.

Enter the configure terminal command to access global configuration mode.
```
device# configure terminal
```
Enter the router ospf command to enter OSPF router configuration mode and enable OSPFv2 on the device.
```
device(config)# router ospf
```
Enter the area command to define an OSPFv2 area ID.
```
device(config-ospf-router)# area 0
```
Enter the area command to define a second OSPFv2 area ID.
```
device(config-ospf-router)# area 10.1.1.1
```

The following example assigns an OSPFv2 ID to two areas. One of the areas is assigned by decimal number. The second area is assigned by IP address.

device# configure terminal
device(config)# router ospf 
device(config-ospf-router)# area 0
device(config-ospf-router)# area 10.1.1.1