Configure the NSSA Area

See NSSA Configuration, Summary Address Configuration, and Area Default-Cost for the topology for this procedure. An NSSA area has the capability to import a limited number of external routes.

1. Enter Global Configuration mode in SEFOS1.

   SEFOS# configure terminal
   

2. Enable OSPF globally in the switch SEFOS1.

   SEFOS(config)# router ospf
   

3. Configure the OSPF router ID.

   SEFOS(config-router)# router-id 10.10.2.1
   

4. Configure the OSPF interface.

   SEFOS(config-router)# network 10.4.0.1 area 0.0.0.0
   SEFOS(config-router)# network 10.10.2.1 area 0.0.0.6
   

5. Configure the area 0.0.0.6 as an NSSA area.

   SEFOS(config-router)# area 0.0.0.6 nssa