Well-Known Community Policy Behavior
draft-ietf-grow-wkc-behavior-04

Document Type Active Internet-Draft (grow WG)
Last updated 2019-05-20 (latest revision 2019-05-16)
Replaces draft-ymbk-grow-wkc-behavior
Stream IETF
Intended RFC status Proposed Standard
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Stream WG state Submitted to IESG for Publication
Document shepherd Job Snijders
Shepherd write-up Show (last changed 2019-04-17)
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Responsible AD Warren Kumari
Send notices to Job Snijders <job@ntt.net>
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Network Working Group                                     J. Borkenhagen
Internet-Draft                                                      AT&T
Intended status: Best Current Practice                           R. Bush
Expires: November 17, 2019                     Internet Initiative Japan
                                                               R. Bonica
                                                        Juniper Networks
                                                            S. Bayraktar
                                                           Cisco Systems
                                                            May 16, 2019

                  Well-Known Community Policy Behavior
                    draft-ietf-grow-wkc-behavior-04

Abstract

   Popular BGP implementations manipulate Well-known Communities
   differently from one another.  This results in difficulties for
   operators.  Network operators are encouraged to deploy consistent
   community handling across their networks, taking the inconsistent
   behaviors from the various BGP implementations they operate into
   consideration.  This document recommends specific action items to
   limit future inconsistency, namely BGP implementors are expected to
   not create any further inconsistencies from this point forward.

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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   Drafts is at https://datatracker.ietf.org/drafts/current/.

   Internet-Drafts are draft documents valid for a maximum of six months
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   material or to cite them other than as "work in progress."

   This Internet-Draft will expire on November 17, 2019.

Copyright Notice

   Copyright (c) 2019 IETF Trust and the persons identified as the
   document authors.  All rights reserved.

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Internet-Draft    Well-Known Community Policy Behavior          May 2019

   This document is subject to BCP 78 and the IETF Trust's Legal
   Provisions Relating to IETF Documents
   (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
   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.  Manipulation of Communities by Policy . . . . . . . . . . . .   3
   4.  Community Manipulation Policy Differences . . . . . . . . . .   3
   5.  Documentation of Vendor Implementations . . . . . . . . . . .   4
     5.1.  Note on an Inconsistency  . . . . . . . . . . . . . . . .   5
   6.  Note for Those Writing RFCs for New Community-Like Attributes   5
   7.  Action Items  . . . . . . . . . . . . . . . . . . . . . . . .   5
   8.  Security Considerations . . . . . . . . . . . . . . . . . . .   6
   9.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .   6
   10. Acknowledgments . . . . . . . . . . . . . . . . . . . . . . .   6
   11. References  . . . . . . . . . . . . . . . . . . . . . . . . .   6
     11.1.  Normative References . . . . . . . . . . . . . . . . . .   6
     11.2.  Informative References . . . . . . . . . . . . . . . . .   6
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .   6

1.  Introduction

   The BGP Communities Attribute was specified in [RFC1997] which
   introduced the concept of Well-Known Communities.  In hindsight,
   [RFC1997] did not prescribe as fully as it should have how Well-Known
   Communities may be manipulated by policies applied by operators.
   Currently, implementations differ in this regard, and these
   differences can result in inconsistent behaviors that operators find
   difficult to identify and resolve.

   This document describes the current behavioral differences in order
   to assist operators in generating consistent community-manipulation
   policies in a multi-vendor environment, and to prevent the
   introduction of additional divergence in implementations.

   This document recommends specific action items to limit future
   inconsistency.

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2.  Requirements Language
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