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An Application of the BGP Community Attribute in Multi-home Routing (RFC1998)

IP.com Disclosure Number: IPCOM000004271D
Original Publication Date: 1996-Aug-01
Included in the Prior Art Database: 2000-Sep-13
Document File: 7 page(s) / 16K

Publishing Venue

Internet Society Requests For Comment (RFCs)

Related People

E. Chen & T. Bates: AUTHOR

Abstract

This document presents an application of the BGP community attribute [2] in simplifying the implementation and configuration of routing policies in the multi-provider Internet. It shows how the community based configuration can be used to replace the AS-based customization of the BGP "LOCAL_PREF" attribute, a common method used today. Not only does the technique presented simplifies configuration and management at the provider level, it also represents a paradigm shift in that it gives the potential for the customer to control its own routing policy with respect to its service provider, as well as providing the ability for policy configuration to be done at a prefix based granularity rather than the more common AS based granularity.

This text was extracted from a ASCII Text document.
This is the abbreviated version, containing approximately 19% of the total text.

Network Working Group E. Chen

Request for Comments: 1998 MCI

Category: Informational T. Bates

cisco Systems

August 1996

An Application of the BGP Community Attribute

in Multi-home Routing

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 presents an application of the BGP community attribute

[2] in simplifying the implementation and configuration of routing

policies in the multi-provider Internet. It shows how the community

based configuration can be used to replace the AS-based customization

of the BGP "LOCAL_PREF" attribute, a common method used today. Not

only does the technique presented simplifies configuration and

management at the provider level, it also represents a paradigm shift

in that it gives the potential for the customer to control its own

routing policy with respect to its service provider, as well as

providing the ability for policy configuration to be done at a prefix

based granularity rather than the more common AS based granularity.

1. Introduction

In the multi-provider Internet, it is common for a service subscriber

(i.e., customer) to have more than one service provider, or to have

arrangements for redundant connectivity to the global connected

Internet. As discussed in [3], routing strategies in these cases

usually require coordination between the service subscriber and its

providers, which typically leads to customization of router

configurations (e.g., BGP "LOCAL_PREF") not only by the subscriber,

but also by its providers. Due to the large number of customers a

provider serves, customization of router configurations at the

provider level may present management and scalability problems.

This document presents an application of the BGP community attribute

in simplifying the implementation of routing strategies in the

multi-provider Internet. More specifically, the technique presented

uses a community-based, rather than the common AS-based,

configuration of the BGP "LOCAL_PREF". It essentially removes the

need for customized configuration of the BGP "LOCAL_PREF" attribute

at the provider level while maintaining the same level of routing

functionality and flexibility.

It also represents a paradigm shift in that it gives the potential

for the customer to control its own routing policy with respect to

its service provider, as well as providing the ability for policy

configuration to be done at a prefix based granularity rather than

the more common AS based granularity in use today.

2. AS-based Configuration and its Drawbacks

As d...