RFC 3101 (rfc3101) - Page 1 of 33

The OSPF Not-So-Stubby Area (NSSA) Option

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Network Working Group                                          P. Murphy
Request for Comments: 3101                          US Geological Survey
Obsoletes: 1587                                             January 2003
Category: Standards Track


               The OSPF Not-So-Stubby Area (NSSA) Option

Status of this Memo

   This document specifies an Internet standards track protocol for the
   Internet community, and requests discussion and suggestions for
   improvements.  Please refer to the current edition of the "Internet
   Official Protocol Standards" (STD 1) for the standardization state
   and status of this protocol.  Distribution of this memo is unlimited.

Copyright Notice

   Copyright (C) The Internet Society (2003).  All Rights Reserved.

Abstract

   This memo documents an optional type of Open Shortest Path First
   (OSPF) area that is somewhat humorously referred to as a "not-so-
   stubby" area (or NSSA).  NSSAs are similar to the existing OSPF stub
   area configuration option but have the additional capability of
   importing AS external routes in a limited fashion.

   The OSPF NSSA Option was originally defined in RFC 1587.  The
   functional differences between this memo and RFC 1587 are explained
   in Appendix F.  All differences, while expanding capability, are
   backward-compatible in nature.  Implementations of this memo and of
   RFC 1587 will interoperate.


















Murphy                      Standards Track
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