Well-Known Community Policy Behavior
draft-ymbk-grow-wkc-behavior-03

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Last updated 2018-06-21
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Network Working Group                                     J. Borkenhagen
Internet-Draft                                                      AT&T
Intended status: Standards Track                                 R. Bush
Expires: December 23, 2018                     Internet Initiative Japan
                                                               R. Bonica
                                                        Juniper Networks
                                                            S. Bayraktar
                                                           Cisco Systems
                                                           June 21, 2018

                  Well-Known Community Policy Behavior
                    draft-ymbk-grow-wkc-behavior-03

Abstract

   Well-Known BGP Communities are manipulated inconsistently by current
   implementations.  This results in difficulties for operators.  It is
   recommended that removal policies be applied consistently to Well-
   Known Communities.

Requirements Language

   The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT",
   "SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and "OPTIONAL" are to
   be interpreted as described in RFC 2119 [RFC2119] only when they
   appear in all upper case.  They may also appear in lower or mixed
   case as English words, without normative meaning.

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
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   This Internet-Draft will expire on December 23, 2018.

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Copyright Notice

   Copyright (c) 2018 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
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   described in the Simplified BSD License.

Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
   2.  Manipulation of Communities by Policy . . . . . . . . . . . .   3
   3.  Community Manipulation Policy Differences . . . . . . . . . .   3
   4.  Documentation of Vendor Implementations . . . . . . . . . . .   3
     4.1.  Note on an Inconsistency  . . . . . . . . . . . . . . . .   4
   5.  Note for Those Writing RFCs for New     Community-Like
       Attributes  . . . . . . . . . . . . . . . . . . . . . . . . .   4
   6.  Action Items  . . . . . . . . . . . . . . . . . . . . . . . .   5
   7.  Security Considerations . . . . . . . . . . . . . . . . . . .   5
   8.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .   5
   9.  Acknowledgements  . . . . . . . . . . . . . . . . . . . . . .   5
   10. Normative References  . . . . . . . . . . . . . . . . . . . .   5
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .   6

1.  Introduction

   The BGP Communities Attribute was specified in [RFC1997] which
   introduced the concept of Well-Known Communities.  In hindsight, it
   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.

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2.  Manipulation of Communities by Policy

   [RFC1997] says:

   "A BGP speaker receiving a route with the COMMUNITIES path attribute
   may modify this attribute according to the local policy."

   A basic operational need is to add or remove one or more communities
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