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Routing in a Multi-provider Internet (RFC1787)

IP.com Disclosure Number: IPCOM000004040D
Original Publication Date: 1995-Apr-01
Included in the Prior Art Database: 2000-Sep-13
Document File: 7 page(s) / 20K

Publishing Venue

Internet Society Requests For Comment (RFCs)

Related People

Y. Rekhter: AUTHOR

Abstract

This document was prepared by the author on behalf of the Internet Architecture Board (IAB). It is offered by the IAB to stimulate discussion.

This text was extracted from a ASCII document.
This is the abbreviated version, containing approximately 14% of the total text.

Network Working Group Y. Rekhter

Request for Comments: 1787 T.J. Watson Research Center, IBM Corp.

Category: Informational April 1995

Routing in a Multi-provider Internet

Status of this Memo

This memo provides information for the Internet community. This memo

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

this memo is unlimited.

Abstract

This document was prepared by the author on behalf of the Internet

Architecture Board (IAB). It is offered by the IAB to stimulate

discussion.

Over the past few years the Internet has undergone significant

changes. Among them is the emergence of multiple Network Service

Providers, where resources that provide Internet-wide IP connectivity

(routers, links) are controlled by different organizations. This

document presents some of the issues related to network layer routing

in a multi-provider Internet, and specifically to the unicast

routing.

1. Network Service Providers vs Network Service Subscribers

Within the current routing paradigm the service offered by a provider

at the network layer (IP) is the set of destinations (hosts) that can

be reached through the provider. Once a subscriber establishes direct

connectivity to a provider, the subscriber can in principle reach all

the destinations reachable through the provider. Since the value of

the Internet-wide connectivity service offered by a provider

increases with the number of destinations reachable through the

provider, providers are motivated to interconnect with each other.

In principle a provider need not offer the same service (in terms of

the set of destinations) to all of its subscribers -- for some of the

subscribers the provider may restrict the services to a subset of the

destinations reachable through the provider. In fact, for certain

types of subscribers constrained connectivity could be seen as part

of the service offered by a provider.

In a multi-provider environment individual providers may be driven by

diverse and sometimes even conflicting goals and objectives. Some of

the providers exist to provide connectivity to only a specific group

of Network Service Subscribers. Other providers place no constraints

on the subscribers that can subscribe to them, as long as the

subscribers pay the fee charged by the providers. Some of the

providers place certain constraints on the reselling of the

connectivity services by organizations (e.g., other providers)

attached to the providers. Some of the providers may be operated by

comp...