Assigning an area range

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 range command, specifying an area ID, and enter the range. Use the cost parameter to specify the cost value for the area range. Repeat as necessary.
```
device(config-ospf-router)# area 10.0.0.10 range 10.45.0.0 10.255.0.0 cost 20
device(config-ospf-router)# area 10.0.0.20 range 10.45.0.0 10.255.0.0 cost 20 
```

The following example defines an area range for subnets on 10.0.0.10 and 10.0.0.20 and sets a cost of 20 for the area range.

device# configure terminal
device(config)# router ospf
device(config-ospf-router)# area 10.0.0.10 range 10.45.0.0 10.255.0.0 cost 20
device(config-ospf-router)# area 10.0.0.20 range 10.45.0.0 10.255.0.0 cost 20