BGP ACCEPT_OWN Community Attribute
RFC 7611

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Internet Engineering Task Force (IETF)                         J. Uttaro
Request for Comments: 7611                                          AT&T
Category: Standards Track                                   P. Mohapatra
ISSN: 2070-1721                                         Sproute Networks
                                                                D. Smith
                                                           Cisco Systems
                                                               R. Raszuk
                                                           Mirantis Inc.
                                                              J. Scudder
                                                        Juniper Networks
                                                             August 2015

                   BGP ACCEPT_OWN Community Attribute

Abstract

   Under certain conditions, it is desirable for a Border Gateway
   Protocol (BGP) route reflector to be able to modify the Route Target
   (RT) list of a Virtual Private Network (VPN) route that the route
   reflector distributes, enabling the route reflector to control how a
   route originated within one VPN Routing and Forwarding table (VRF) is
   imported into other VRFs.  This technique works effectively as long
   as the VRF that exports the route is not on the same Provider Edge
   (PE) router as the VRF(s) that imports the route.  However, due to
   the constraints of BGP, it does not work if the two are on the same
   PE.  This document describes a modification to BGP allowing this
   technique to work when the VRFs are on the same PE and to be used in
   a standard manner throughout an autonomous system.

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 5741.

   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/rfc7611.

Uttaro, et al.               Standards Track                    [Page 1]
RFC 7611                       ACCEPT_OWN                    August 2015

Copyright Notice

   Copyright (c) 2015 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
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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
     1.1.  Requirements Language . . . . . . . . . . . . . . . . . .   3
   2.  ACCEPT_OWN Community  . . . . . . . . . . . . . . . . . . . .   3
     2.1.  Route Acceptance  . . . . . . . . . . . . . . . . . . . .   3
     2.2.  Propagating ACCEPT_OWN between Address Families . . . . .   4
     2.3.  Configuration Control . . . . . . . . . . . . . . . . . .   4
   3.  Decision Process  . . . . . . . . . . . . . . . . . . . . . .   4
   4.  Deployment Considerations . . . . . . . . . . . . . . . . . .   5
   5.  Other Applications  . . . . . . . . . . . . . . . . . . . . .   5
   6.  Security Considerations . . . . . . . . . . . . . . . . . . .   5
   7.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .   5
   8.  References  . . . . . . . . . . . . . . . . . . . . . . . . .   6
     8.1.  Normative References  . . . . . . . . . . . . . . . . . .   6
     8.2.  Informative References  . . . . . . . . . . . . . . . . .   6
   Appendix A.  Local Extranet Application (Non-normative) . . . . .   7
   Acknowledgments . . . . . . . . . . . . . . . . . . . . . . . . .   8
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .   8

1.  Introduction

   In certain scenarios, a BGP speaker may maintain multiple VRFs
   [RFC4364].  Under certain conditions, it is desirable for a route
   reflector to be able to modify the RT list of a VPN route that the
   route reflector distributes, enabling the route reflector to control
   how a route originated within one VRF is imported into other VRFs.
   Though it is possible to perform such control directly on the
   originator, it may be operationally cumbersome in an autonomous
   system with a large number of border routers having complex BGP
   policies.

Uttaro, et al.               Standards Track                    [Page 2]