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The OSPF NSSA Option (RFC1587)

IP.com Disclosure Number: IPCOM000002421D
Original Publication Date: 1994-Mar-01
Included in the Prior Art Database: 2019-Feb-13
Document File: 17 page(s) / 21K

Publishing Venue

Internet Society Requests For Comment (RFCs)

Related People

R. Coltun: AUTHOR [+1]

Related Documents

10.17487/RFC1587: DOI

Abstract

This document describes a new optional type of OSPF area, 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. [STANDARDS-TRACK]

This text was extracted from a PDF file.
This is the abbreviated version, containing approximately 9% of the total text.

Network Working Group R. Coltun Request for Comments: 1587 RainbowBridge Communications Category: Standards Track V. Fuller Stanford University March 1994

The OSPF 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.

Table Of Contents

1.0 Abstract ................................................. 1 2.0 Overview ................................................. 2 2.1 Motivation ............................................... 2 2.2 Proposed Solution ........................................ 3 3.0 Implementation Details ................................... 5 3.1 The N-bit ................................................ 5 3.2 Type-7 Address Ranges .................................... 5 3.3 Type-7 LSAs .............................................. 5 3.4 Originating Type-7 LSAs .................................. 7 3.5 Calculating Type-7 AS External Routes .................... 8 3.6 Incremental Updates ...................................... 10 4.0 Originating Type-5 LSAs .................................. 10 4.1 Translating Type-7 LSAs .................................. 10 4.2 Flushing Translated Type-7 LSAs .......................... 13 5.0 Acknowledgements ......................................... 13 6.0 References ............................................... 13 7.0 Security Considerations .................................. 13 8.0 Authors’ Addresses ....................................... 14 Appendix A: Type-7 LSA Packet Format ......................... 15 Appendix B: The Options Field ................................ 16 Appendix C: Configuration Parameters ......................... 17

1.0 Abstract

This document describes a new optional type of OSPF area, 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.

Coltun & Fuller [Page 1]

RFC 1587 OSPF NSSA Option March 1994

2.0 Overview

2.1 Motivation

Wide-area transit networks (such as the NSFNET regionals) often have connections to moderately-complex "leaf" sites. A leaf site may have multiple IP network numbers assigned to it.

Typically, one of the leaf site’s networks is directly connected to a router provided and administered by the transit network while the others are distributed throughout and administered by the site. From the transit network’s perspective, all of the network numbers associated with the site make up a single "stub" entity. For example, BARRNet has one site composed of a class-B network, 130.57.0.0, and a class-C network, 192.31.114.0. From BARRNet’s perspective, this configuration looks somethin...

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