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Classless Inter-Domain Routing (CIDR): an Address Assignment and Aggregation Strategy (RFC1519)

IP.com Disclosure Number: IPCOM000002349D
Original Publication Date: 1993-Sep-01
Included in the Prior Art Database: 2000-Sep-12
Document File: 20 page(s) / 56K

Publishing Venue

Internet Society Requests For Comment (RFCs)

Related People

V. Fuller: AUTHOR [+4]

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.

This text was extracted from a ASCII Text document.
This is the abbreviated version, containing approximately 5% of the total text.

Network Working Group V. Fuller

Request for Comments: 1519 BARRNet

Obsoletes: 1338 T. Li

Category: Standards Track cisco

J. Yu

MERIT

K. Varadhan

OARnet

September 1993

Classless Inter-Domain Routing (CIDR):

an Address Assignment and Aggregation Strategy

Status of this Memo

This RFC 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" for the standardization state and status

of this protocol. 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.

Table of Contents

Acknowledgements ................................................. 2

1. Problem, Goal, and Motivation ................................ 2

2. CIDR address allocation ...................................... 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 and practices ...... 11

4.1 Protocol-independent 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

4.5 Intra-domain protocol considerations ........................ 15

5. Example of new allocation and routing ........................ 15

5.1 Address allocation .......................................... 15

5.2 Routing advertisements ...................................... 17

6. Extending CIDR to class A addresses .......................... 18

7. Domain Naming Service considerations ......................... 20

7.1 Procedural changes for class-C "supernets" ..............