Configuring an NSSA

Enter the configure terminal command to access global configuration mode.
```
device# configure terminal
```
Enter the ip router-id command to specify the router ID.
```
device(config) ip router-id 10.3.3.3
```
Enter the ipv6 router ospf command to enter OSPFv3 router configuration mode and enable OSPFv3 on the device.
```
device(config)# ipv6 router ospf
```
Enter the area nssa command with the default-information-originate keyword and specify a cost.
```
device(config-ipv6-router-ospf-vrf-default-vrf)# area 3 nssa default-information-originate metric 33
```
Area 3 is defined as an NSSA with the default route option and an additional cost of 33.

The following example sets an additional cost of 33 on an NSSA defined as 3.

device# configure terminal
device(config)# ip router-id 10.3.3.3 
device(config)# ipv6 router ospf 
device(config-ipv6-router-ospf-vrf-default-vrf)# area 3 nssa default-information-originate metric 33