Browse Prior Art Database

Using a Dedicated AS for Sites Homed to a Single Provider (RFC2270)

IP.com Disclosure Number: IPCOM000002831D
Original Publication Date: 1998-Jan-01
Included in the Prior Art Database: 2000-Sep-13
Document File: 5 page(s) / 11K

Publishing Venue

Internet Society Requests For Comment (RFCs)

Related People

J. Stewart: AUTHOR [+4]

Abstract

With the increased growth of the Internet, the number of customers using BGP4 has grown significantly. RFC1930 outlines a set of guidelines for when one needs and should use an AS. However, the customer and service provider (ISP) are left with a problem as a result of this in that while there is no need for an allocated AS under the guidelines, certain conditions make the use of BGP4 a very pragmatic and perhaps only way to connect a customer homed to a single ISP. This paper proposes a solution to this problem in line with recommendations set forth in RFC1930.

This text was extracted from a ASCII Text document.
This is the abbreviated version, containing approximately 26% of the total text.

Network Working Group J. Stewart

Request for Comments: 2270 ISI

Category: Informational T. Bates

R. Chandra

E. Chen

Cisco

January 1998

Using a Dedicated AS for Sites Homed to a Single Provider

Status of this Memo

This memo provides information for the Internet community. It does

not specify an Internet standard of any kind. Distribution of this

memo is unlimited.

Copyright Notice

Copyright (C) The Internet Society (1998). All Rights Reserved.

Abstract

With the increased growth of the Internet, the number of customers

using BGP4 has grown significantly. RFC1930 outlines a set of

guidelines for when one needs and should use an AS. However, the

customer and service provider (ISP) are left with a problem as a

result of this in that while there is no need for an allocated AS

under the guidelines, certain conditions make the use of BGP4 a very

pragmatic and perhaps only way to connect a customer homed to a

single ISP. This paper proposes a solution to this problem in line

with recommendations set forth in RFC1930.

1. Problems

With the increased growth of the Internet, the number of customers

using BGP4 [1],[2] has grown significantly. RFC1930 [4] outlines a

set of guidelines for when one needs and should use an AS. However,

the customer and service provider (ISP) are left with a problem as a

result of this in that while there is no need for an allocated AS

under the guidelines, certain conditions make the use of BGP4 a very

pragmatic and perhaps only way to connect a customer homed to a

single ISP. These conditions are as follows:

1) Customers multi-homed to single provider

Consider the scenario outlined in Figure 1 below.

+-------+ +-------+

+----+ | | |

+------+ | | ISP A +------+ ISP B |

| Cust.+---+ | | | |

| X +--------+ | | |

+------+ ++-----++\ +-------+

| | \

| | \ +--------+

++-----++ +-| |

| Cust. | | ISP C |

| Y | | |

+-------+ +--------+

Figure 1: Customers multi-home to a single provider

Here both customer X and customer Y are multi-homed to a single

provider, ISP A. Because these multiple connections are "localized"

between the ISP A and its customers, the rest of the routing system

(ISP...