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Supernetting: an Address Assignment and Aggregation Strategy (RFC1338)

IP.com Disclosure Number: IPCOM000002161D
Original Publication Date: 1992-Jun-01
Included in the Prior Art Database: 2019-Feb-11
Document File: 20 page(s) / 28K

Publishing Venue

Internet Society Requests For Comment (RFCs)

Related People

V. Fuller: AUTHOR [+3]

Related Documents

10.17487/RFC1338: DOI

Abstract

This memo discusses strategies for address assignment of the existing IP address space with a view to conserve the address space and stem the explosive growth of routing tables in default-route-free routers run by transit routing domain providers. This memo provides information for the Internet community. It does not specify an Internet standard.

This text was extracted from a PDF file.
This is the abbreviated version, containing approximately 8% of the total text.

Network Working Group V. Fuller Request for Comments: 1338 BARRNet T. Li cisco J. Yu MERIT K. Varadhan OARnet June 1992

Supernetting: an Address Assignment and Aggregation Strategy

Status of this Memo

This memo provides information for the Internet community. It does not specify an Internet standard. Distribution of this memo is unlimited.

Abstract

This memo discusses strategies for address assignment of the existing IP address space with a view to conserve the address space and stem the explosive growth of routing tables in default-route-free routers run by transit routing domain providers.

Table of Contents

Acknowledgements ................................................. 2 1. Problem, goal, and motivation ................................ 2 2. Scheme plan .................................................. 3 2.1. Aggregation and its limitations ............................ 3 2.2. Distributed network number allocation ...................... 5 3. Cost-benefit analysis ........................................ 6 3.1. Present allocation figures ................................. 7 3.2. Historic growth rates ...................................... 8 3.3. Detailed analysis .......................................... 8 3.3.1. Benefits of new addressing plan .......................... 9 3.3.2. Growth rate projections .................................. 9 4. Changes to Inter-Domain routing protocols .................... 11 4.1. General semantic changes ................................... 11 4.2. Rules for route advertisement .............................. 11 4.3. How the rules work ......................................... 13 4.4. Responsibility for and configuration of aggregation ........ 14 5. Example of new allocation and routing ........................ 15 5.1. Address allocation ......................................... 15 5.2. Routing advertisements ..................................... 17 6. Transitioning to a long term solution ........................ 18

Fuller, Li, Yu, & Varadhan [Page 1]

RFC 1338 Supernetting June 1992

7. Conclusions .................................................. 18 8. Recommendations .............................................. 18 9. Bibliography ................................................. 19 10. Security Considerations ...................................... 19 11. Authors’ Addresses ........................................... 19

Acknowledgements

The authors wish to express their appreciation to the members of the ROAD group with whom many of the ideas contained in this document were inspired and developed.

1. Problem, Goal, and Motivation

As the Internet has evolved and grown over in recent years, it has become painfully evident that it is soon to face several serious scaling problems. These include:

1. Exhaustion of the class-B network address space. One fundamental cause of this problem is the lack of a network class of a size which is appropriate for mid-sized organization; class-C, with a maximum of 254 host...

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