Use of BGP Large Communities
draft-ietf-grow-large-communities-usage-06

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Last updated 2017-04-14
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Global Routing Operations                                    J. Snijders
Internet-Draft                                                J. Heasley
Intended status: Informational                                       NTT
Expires: October 16, 2017                                     M. Schmidt
                                                                 i3D.net
                                                          April 14, 2017

                      Use of BGP Large Communities
               draft-ietf-grow-large-communities-usage-06

Abstract

   Examples and inspiration for operators to use BGP Large Communities.

Status of This Memo

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   This Internet-Draft will expire on October 16, 2017.

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Snijders, et al.        Expires October 16, 2017                [Page 1]
Internet-Draft        Use of BGP Large Communities            April 2017

Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
   2.  The Design Overview . . . . . . . . . . . . . . . . . . . . .   2
     2.1.  Informational Communities . . . . . . . . . . . . . . . .   4
     2.2.  Action Communities  . . . . . . . . . . . . . . . . . . .   4
   3.  Examples of Informational Communities . . . . . . . . . . . .   5
     3.1.  Location  . . . . . . . . . . . . . . . . . . . . . . . .   5
       3.1.1.  An ISO 3166-1 Numeric Function  . . . . . . . . . . .   5
       3.1.2.  An UN M.49 Region Function  . . . . . . . . . . . . .   5
     3.2.  Relation Function . . . . . . . . . . . . . . . . . . . .   6
     3.3.  Combining Informational Communities . . . . . . . . . . .   6
   4.  Examples of Action Communities  . . . . . . . . . . . . . . .   7
     4.1.  Selective NO_EXPORT . . . . . . . . . . . . . . . . . . .   7
       4.1.1.  ASN Based Selective NO_EXPORT . . . . . . . . . . . .   7
       4.1.2.  Location Based Selective NO_EXPORT  . . . . . . . . .   7
     4.2.  Selective AS_PATH Prepending  . . . . . . . . . . . . . .   8
       4.2.1.  ASN Based Selective AS_PATH Prepending  . . . . . . .   8
       4.2.2.  Location Based Selective AS_PATH Prepending . . . . .   9
     4.3.  Manipulation of the LOCAL_PREF Attribute  . . . . . . . .   9
       4.3.1.  Global Manipulation of LOCAL_PREF . . . . . . . . . .  10
       4.3.2.  Region Based Manipulation of LOCAL_PREF . . . . . . .  10
       4.3.3.  Note of Caution for LOCAL_PREF Functions  . . . . . .  11
     4.4.  Route Server Prefix Distribution Control  . . . . . . . .  11
   5.  Security Considerations . . . . . . . . . . . . . . . . . . .  12
   6.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .  12
   7.  Acknowledgments . . . . . . . . . . . . . . . . . . . . . . .  12
   8.  References  . . . . . . . . . . . . . . . . . . . . . . . . .  13
     8.1.  Normative References  . . . . . . . . . . . . . . . . . .  13
     8.2.  Informative References  . . . . . . . . . . . . . . . . .  13
     8.3.  URIs  . . . . . . . . . . . . . . . . . . . . . . . . . .  13
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .  14

1.  Introduction

   BGP Large Communities [RFC8092] provide a mechanism to signal opaque
   information between Autonomous Systems (ASs).  In very much the same
   way that [RFC1998] provides a concrete real-world application for
   [RFC1997] communities, this document presents examples of how
   operators might utilize BGP Large Communities to achieve various
   goals.  This document draws on the experience of operator communities
   such as NANOG [1] and NLNOG [2].

2.  The Design Overview

   BGP Large Communities are composed of three 4-octet fields.  The
   first is the Global Administrator (GA) field, whose value is the
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