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Creating a stub area

A stub area does not receive advertisements for external routes, which reduces the size of the link state database. A stub area has only one area border router. Any packets destined outside the area are simply routed to that area border exit point, examined by the area border router, and forwarded to a destination.

A not so stubby area (NSSA) also prevents the flooding of AS-External Link State advertisements into the area by replacing them with a default route. The added feature of an NSSA is the ability to import small stub (non-OSPF) routing domains into OSPF.

To create a stub area or NSSA:

  1. From the Device Manager window menu bar, choose IP Routing > OSPF > Area.
    2. The OSPF dialog box opens with the Area tab displayed.
  2. Type or select stub area or NSSA using the ImportAsExtern list arrow.
  3. Type or select stub area or NSSA using the ImportASExtern list arrow.
  4. Click Apply.
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