Stub area

This area connects to the AS backbone through one or more ABRs. It does not allow an internal ASBR and does not allow AS-external-LSAs. A stub area supports these actions:

  • Advertise the area's inter-area routes to the backbone area.

  • Advertise inter-area routes from other areas.

  • Use the inter-area-prefix-LSA default route to advertise routes to an ASBR and to other areas.

You can configure the stub area ABR to do the following:

  • Suppress advertising some or all of the area's summarized internal routes into the backbone area.

  • Suppress LSA traffic from other areas in the AS by replacing inter-area-prefix-LSAs and the default external route from the backbone area with the default route (::/0).

Virtual links are not allowed for stub areas.