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Versions: 00 01 02 03 04 draft-ietf-idr-large-community

IDR                                                             J. Heitz
Internet-Draft                                                     Cisco
Intended status: Standards Track                                K. Patel
Expires: March 10, 2017                                           Arrcus
                                                             J. Snijders
                                                                     NTT
                                                             I. Bagdonas
                                                                 Equinix
                                                              A. Simpson
                                                                   Nokia
                                                       September 6, 2016


                          Large BGP Community
                   draft-heitz-idr-large-community-04

Abstract

   A new type of BGP community attribute that contains communities that
   each hold a 4-octet AS number and a 8-octet opaque field is defined.

Requirements Language

   The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT",
   "SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and "OPTIONAL" in this
   document are to be interpreted as described in [RFC2119].

Status of This Memo

   This Internet-Draft is submitted in full conformance with the
   provisions of BCP 78 and BCP 79.

   Internet-Drafts are working documents of the Internet Engineering
   Task Force (IETF).  Note that other groups may also distribute
   working documents as Internet-Drafts.  The list of current Internet-
   Drafts is at http://datatracker.ietf.org/drafts/current/.

   Internet-Drafts are draft documents valid for a maximum of six months
   and may be updated, replaced, or obsoleted by other documents at any
   time.  It is inappropriate to use Internet-Drafts as reference
   material or to cite them other than as "work in progress."

   This Internet-Draft will expire on March 10, 2017.








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Copyright Notice

   Copyright (c) 2016 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.  Large BGP Community Attribute . . . . . . . . . . . . . . . .   3
   3.  Textual Representation  . . . . . . . . . . . . . . . . . . .   3
   4.  Error Handling  . . . . . . . . . . . . . . . . . . . . . . .   3
   5.  Security Considerations . . . . . . . . . . . . . . . . . . .   4
   6.  Implementation status - RFC EDITOR: REMOVE BEFORE PUBLICATION   4
   7.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .   4
   8.  Acknowledgements  . . . . . . . . . . . . . . . . . . . . . .   4
   9.  References  . . . . . . . . . . . . . . . . . . . . . . . . .   4
     9.1.  Normative References  . . . . . . . . . . . . . . . . . .   4
     9.2.  Informative References  . . . . . . . . . . . . . . . . .   5
     9.3.  URIs  . . . . . . . . . . . . . . . . . . . . . . . . . .   5
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .   5

1.  Introduction

   A Large Community attribute is defined that encodes 12 bytes
   communities, suitable for 4-Octet Autonomous System Numbers that
   require 8 octets of locally significant opaque data.

   The Large Community is specifically designed to accomodate routing
   policy related to 4-byte ASNs, as it allows operators to specify two
   4-byte ASNs and still have room for 4 bytes for an action.  For
   example, to make a request to AS65551 to add 3 prepends when sending
   a route to AS65536, one might add the Large Community
   65551:303:65536.  AS65551 would publish a list of large communities
   and their associated actions.  The Large Community is opaque.

   To ensure rapid and smooth adoption of the new community attribute,
   it must be as similar to the [RFC1997] community as possible, only
   bigger.



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2.  Large BGP Community Attribute

   The Large Community Attribute is a transitive optional BGP attribute,
   with the Type Code (suggested 41) to be assigned by IANA.  The
   attribute consists of a set of Large Communities.  All routes with
   the Large Community attribute belong to the communities listed in the
   attribute.

   Each Large Community is encoded as a 12-octet quantity, as follows:

    0                   1                   2                   3
    0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
   |                     Autonomous System number                  |
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
   |                         Local Data Part 1                     |
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
   |                         Local Data Part 2                     |
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

   Autonomous System Number:  This field indicates the Autonomous System
      in which the Large Community has a meaning.

   Local Data part 1:  data set by network operator

   Local Data part 2:  data set by network operator

3.  Textual Representation

   The textual representation of the Large Community is A:B:C, where A
   is the Autonomous System number, B is the Local Data part 1 and C is
   the Local Data part 2.  A ranges from 0 to 4294967295.  B ranges from
   0 to 4294967295.  C ranges from 0 to 4294967295.  A, B and C are
   plain decimal non-negative integers without leading zeroes.  Each
   number must appear, even if it is 0.  For example, "0:1:2" cannot be
   written as ":1:2".  The string is expected to match the following
   regular expression: ^[0-9]+:[0-9]+:[0-9]+$

4.  Error Handling

   The error handling of Large Community is as follows:

   o  The Large Community attribute SHALL be considered malformed if its
      length is not a non-zero multiple of 12 bytes.

   o  An UPDATE message with a malformed Large Community attribute SHALL
      be handled using the approach of "treat-as-withdraw" as described
      in section 2 [RFC7606].



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5.  Security Considerations

   TBD

6.  Implementation status - RFC EDITOR: REMOVE BEFORE PUBLICATION

   This section records the status of known implementations of the
   protocol defined by this specification at the time of posting of this
   Internet-Draft, and is based on a proposal described in [RFC7942].
   The description of implementations in this section is intended to
   assist the IETF in its decision processes in progressing drafts to
   RFCs.  Please note that the listing of any individual implementation
   here does not imply endorsement by the IETF.  Furthermore, no effort
   has been spent to verify the information presented here that was
   supplied by IETF contributors.  This is not intended as, and must not
   be construed to be, a catalog of available implementations or their
   features.  Readers are advised to note that other implementations may
   exist.

   As of today these vendors have produced an implementation of Large
   BGP Community:

   o  Cisco IOS XR

   o  ExaBGP

   The latest implementation news is tracked at
   http://largebgpcommunities.net/ [1].

7.  IANA Considerations

   IANA is requested to assign a BGP path attribute value for the Large
   Community attribute (suggested 41).

8.  Acknowledgements

   Thanks to Ruediger Volk, Russ White, Acee Lindem, Shyam Sethuram,
   Jared Mauch, Joel M.  Halpern and Nick Hilliard for insightful review
   and comments.

9.  References

9.1.  Normative References

   [RFC1997]  Chandra, R., Traina, P., and T. Li, "BGP Communities
              Attribute", RFC 1997, DOI 10.17487/RFC1997, August 1996,
              <http://www.rfc-editor.org/info/rfc1997>.




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   [RFC2119]  Bradner, S., "Key words for use in RFCs to Indicate
              Requirement Levels", BCP 14, RFC 2119,
              DOI 10.17487/RFC2119, March 1997,
              <http://www.rfc-editor.org/info/rfc2119>.

   [RFC7606]  Chen, E., Ed., Scudder, J., Ed., Mohapatra, P., and K.
              Patel, "Revised Error Handling for BGP UPDATE Messages",
              RFC 7606, DOI 10.17487/RFC7606, August 2015,
              <http://www.rfc-editor.org/info/rfc7606>.

9.2.  Informative References

   [RFC7942]  Sheffer, Y. and A. Farrel, "Improving Awareness of Running
              Code: The Implementation Status Section", BCP 205,
              RFC 7942, DOI 10.17487/RFC7942, July 2016,
              <http://www.rfc-editor.org/info/rfc7942>.

9.3.  URIs

   [1] https://largebgpcommunities.net

Authors' Addresses

   Jakob Heitz
   Cisco
   170 West Tasman Drive
   San Jose, CA  95054
   USA

   Email: jheitz@cisco.com


   Keyur Patel
   Arrcus, Inc

   Email: keyur@arrcus.com


   Job Snijders
   NTT Communications
   Theodorus Majofskistraat 100
   Amsterdam  1065 SZ
   NL

   Email: job@ntt.net






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   Ignas Bagdonas
   Equinix
   London
   UK

   Email: ibagdona.ietf@gmail.com


   Adam Simpson
   Nokia
   600 March Road
   Ottawa  Ontario K2K 2E6
   Canada

   Email: adam.1.simpson@nokia.com




































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