5.6 Using and Configuring NSSA
5.6.3 Configuring NSSA
The steps used to configure OSPF NSSA are as follows.
  1. Step 1 Configure standard OSPF operation on one or more interfaces that will be attached to NSSAs.
  2. Step 2 Configure an area as NSSA.

    router(config)#area area-id nssa

  3. Step 3 (Optional) Control the summarization or filtering during the translation. The example shows how Router B will summarize routes using the following command:

    router(config)#summary-address prefix mask [not-advertise] [tag tag]

To verify that NSSA is defined on a given router, you can use the show ip ospf command. This command shows you general OSPF-configured parameters including the number of NSSAs to which the router is attached, and whether the router is performing LSA translation.

Additional commands that you can use for verifying and monitoring NSSA operation are shown in Figure .