BGP Large Communities Attribute
RFC 8092

Document Type RFC - Proposed Standard (February 2017; Errata)
Last updated 2017-03-09
Replaces draft-heitz-idr-large-community
Stream IETF
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Reviews GENART will not review this version
Stream WG state Submitted to IESG for Publication
Document shepherd John Scudder
Shepherd write-up Show (last changed 2016-11-22)
IESG IESG state RFC 8092 (Proposed Standard)
Consensus Boilerplate Yes
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Responsible AD Alvaro Retana
Send notices to "John Scudder" <jgs@juniper.net>
IANA IANA review state Version Changed - Review Needed
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Internet Engineering Task Force (IETF)                     J. Heitz, Ed.
Request for Comments: 8092                                         Cisco
Category: Standards Track                               J. Snijders, Ed.
ISSN: 2070-1721                                                      NTT
                                                                K. Patel
                                                                  Arrcus
                                                             I. Bagdonas
                                                                 Equinix
                                                             N. Hilliard
                                                                    INEX
                                                           February 2017

                    BGP Large Communities Attribute

Abstract

   This document describes the BGP Large Communities attribute, an
   extension to BGP-4.  This attribute provides a mechanism to signal
   opaque information within separate namespaces to aid in routing
   management.  The attribute is suitable for use with all Autonomous
   System Numbers (ASNs) including four-octet ASNs.

Status of This Memo

   This is an Internet Standards Track document.

   This document is a product of the Internet Engineering Task Force
   (IETF).  It represents the consensus of the IETF community.  It has
   received public review and has been approved for publication by the
   Internet Engineering Steering Group (IESG).  Further information on
   Internet Standards is available in Section 2 of RFC 7841.

   Information about the current status of this document, any errata,
   and how to provide feedback on it may be obtained at
   http://www.rfc-editor.org/info/rfc8092.

Heitz, et al.                Standards Track                    [Page 1]
RFC 8092                  BGP Large Communities            February 2017

Copyright Notice

   Copyright (c) 2017 IETF Trust and the persons identified as the
   document authors.  All rights reserved.

   This document is subject to BCP 78 and the IETF Trust's Legal
   Provisions Relating to IETF Documents
   (http://trustee.ietf.org/license-info) in effect on the date of
   publication of this document.  Please review these documents
   carefully, as they describe your rights and restrictions with respect
   to this document.  Code Components extracted from this document must
   include Simplified BSD License text as described in Section 4.e of
   the Trust Legal Provisions and are provided without warranty as
   described in the Simplified BSD License.

Table of Contents

   1. Introduction ....................................................2
   2. Requirements Language ...........................................3
   3. BGP Large Communities Attribute .................................3
   4. Aggregation .....................................................4
   5. Canonical Representation ........................................4
   6. Error Handling ..................................................5
   7. Security Considerations .........................................5
   8. IANA Considerations .............................................6
   9. References ......................................................6
      9.1. Normative References .......................................6
      9.2. Informative References .....................................6
   Acknowledgments ....................................................7
   Contributors .......................................................7
   Authors' Addresses .................................................8

1.  Introduction

   BGP [RFC4271] implementations typically support a routing policy
   language to control the distribution of routing information.  Network
   operators attach BGP communities to routes to associate particular
   properties with these routes.  These properties may include
   information such as the route origin location, or specification of a
   routing policy action to be taken, or one that has been taken, and is
   applied to all routes contained in a BGP Update Message where the
   Communities Attribute is included.  Because BGP communities are
   optional transitive BGP attributes, BGP communities may be acted upon
   or otherwise used by routing policies in other Autonomous Systems
   (ASes) on the Internet.

Heitz, et al.                Standards Track                    [Page 2]
RFC 8092                  BGP Large Communities            February 2017

   A BGP Communities attribute is a variable-length attribute consisting
   of a set of one or more four-octet values, each of which specify a
   community [RFC1997].  Common use of the individual values of this
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