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Applicability Statement for the Implementation of Classless Inter-Domain Routing (CIDR) (RFC1517)

IP.com Disclosure Number: IPCOM000002347D
Original Publication Date: 1993-Sep-01
Included in the Prior Art Database: 2000-Sep-12
Document File: 3 page(s) / 7K

Publishing Venue

Internet Society Requests For Comment (RFCs)

Related People

Internet Engineering Steering Group: AUTHOR [+2]

Abstract

As the Internet has evolved and grown in recent years, it has become clear that it will soon face several serious scaling problems. These include:

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This is the abbreviated version, containing approximately 40% of the total text.

Network Working Group Internet Engineering Steering Group

Request for Comments: 1517 R. Hinden, Editor

Category: Standards Track September 1993

Applicability Statement for the Implementation of

Classless Inter-Domain Routing (CIDR)

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.

1. Introduction

As the Internet has evolved and grown in recent years, it has become

clear that it will soon face several serious scaling problems. These

include:

- Exhaustion of the class-B network address space. One

fundamental cause of this problem is the lack of a network

class of a size that is appropriate for a mid-sized

organization. Class-C, with a maximum of 254 host addresses, is

too small, while class-B, which allows up to 65534 addresses,

is too large to be densely populated. The result is inefficient

utilization of class-B network numbers.

- Routing information overload. The size and rate of growth of the

routing tables in Internet routers is beyond the ability of

current software (and people) to effectively manage.

- Eventual exhaustion of IP network numbers.

It has become clear that the first two of these problems are likely

to become critical in the near term. Classless Inter-Domain Routing

(CIDR) ttempts to deal with these problems by defining a mechanism to

slow the growth of routing tables and reduce the need to allocate new

IP network numbers. It does not attempt to solve the third problem,

which is of a more long-term nature, but instead endeavors to ease

enough of the short to mid-term difficulties to allow the Internet to

continue to function efficiently while progress is made on a longer-

term solution.

The IESG, after a thorough discussion in the IETF, in June 1992

selected CIDR as the solution for the short term routing table

explosion problem [1].

2. Components of the Architecture

The CIDR architecture is described in the following documents:

- "An Architecture for IP Address Allocation with CIDR" [2]

- "Classless Inter-Domain Routing (CIDR): An Address Assignment

and Aggregation Strategy" [3]

The first of these documents presents the overall architecture of

CIDR; the second descri...