Configuring an NSSA

1. Enter the configure terminal command to access global configuration mode.
   

   device# configure terminal

2. Enter the router ospf command to enter OSPF router configuration mode and enable OSPFv2 on the device.
   

   device(config)# router ospf

3. Enter the area nssa command and specify an area address and a cost.
   

   device(config-router-ospf-vrf-default-vrf)# area 10.1.1.1 nssa 1

   Area 10.1.1.1 is defined as an NSSA.

Example

The following example configures OSPF area 10.1.1.1 as an NSSA.

device# configure terminal
device(config)# router ospf
device(config-router-ospf-vrf-default-vrf)# area 10.1.1.1 nssa 1