BGP Well Known Large Community
draft-heitz-idr-wklc-00

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IDR                                                             J. Heitz
Internet-Draft                                                     Cisco
Intended status: Standards Track                               K. Sriram
Expires: September 10, 2020                                         NIST
                                                              B. Dickson

                                                               J. Heasly
                                                           March 9, 2020

                     BGP Well Known Large Community
                        draft-heitz-idr-wklc-00

Abstract

   A range of BGP Autonomous System Numbers is reserved to create a set
   of BGP Well Known Large Communities.

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
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   Internet-Drafts are draft documents valid for a maximum of six months
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   This Internet-Draft will expire on September 10, 2020.

Copyright Notice

   Copyright (c) 2020 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

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Internet-Draft         Well Known Large Community             March 2020

   (https://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
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   the Trust Legal Provisions and are provided without warranty as
   described in the Simplified BSD License.

Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
   2.  Encoding  . . . . . . . . . . . . . . . . . . . . . . . . . .   2
   3.  Transitivity  . . . . . . . . . . . . . . . . . . . . . . . .   3
   4.  Discussion  . . . . . . . . . . . . . . . . . . . . . . . . .   4
   5.  Security Considerations . . . . . . . . . . . . . . . . . . .   4
   6.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .   4
   7.  Normative References  . . . . . . . . . . . . . . . . . . . .   5
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .   5

1.  Introduction

   The Global Administrator field of the BGP Large community [RFC8092]
   is an Autonomous System Number (ASN).  To create a set of Well Known
   Large Communities, a set of ASNs must be reserved for them, such that
   a real ASN in the Global Administrator field cannot be mistaken for a
   Well Known Large Community.

2.  Encoding

   Each BGP Well Known Large Community value 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
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |1 1 1 1 0 1| T |    WKLC ID    |          Data 1               |
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |                             Data 2                            |
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |                             Data 3                            |
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

   The fields are as shown below:

        T          - Transitivity field (2 bits).  This is further
                     described below.

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        WKLC ID    - Well Known Large Community Identifier (1 octet).
                     See IANA Considerations.  If an experimental type
                     is used, then it MUST NOT be hard coded in the BGP
                     speaker software; it MUST be configurable.
                     Different experiments can then run in the same
                     network without having to coordinate identifier
                     assignment during the coding stage.

        Data 1,2,3 - A 10 octet value specific to the WKLC.  Data 1 is