BGP Optimal Route Reflection (BGP-ORR)
draft-ietf-idr-bgp-optimal-route-reflection-11

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Last updated 2016-01-08
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IDR Working Group                                         R. Raszuk, Ed.
Internet-Draft                                              Bloomberg LP
Intended status: Standards Track                               C. Cassar
Expires: July 11, 2016                                     Cisco Systems
                                                                 E. Aman
                                                             TeliaSonera
                                                             B. Decraene
                                                            S. Litkowski
                                                                  Orange
                                                                 K. Wang
                                                        Juniper Networks
                                                         January 8, 2016

                 BGP Optimal Route Reflection (BGP-ORR)
             draft-ietf-idr-bgp-optimal-route-reflection-11

Abstract

   This document proposes a solution for BGP route reflectors to allow
   them to choose the best path their clients would have chosen under
   the same conditions, without requiring further state or any new
   features to be placed on the clients.  This facilitates, for example,
   best exit point policy (hot potato routing).  This solution is
   primarily applicable in deployments using centralized route
   reflectors.

   The solution relies upon all route reflectors learning all paths
   which are eligible for consideration.  Best path selection is
   performed in each route reflector based on a configured virtual
   location in the IGP.  The location can be the same for all clients or
   different per peer/update group or per peer.  Best path selection can
   also be performed based on user configured policies in each route
   reflector.

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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Raszuk, et al.            Expires July 11, 2016                 [Page 1]
Internet-Draft        bgp-optimal-route-reflection          January 2016

   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 July 11, 2016.

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
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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.  Problem Statement . . . . . . . . . . . . . . . . . . . .   3
     1.2.  Existing/Alternative Solutions  . . . . . . . . . . . . .   4
   2.  Proposed Solutions  . . . . . . . . . . . . . . . . . . . . .   4
     2.1.  Client's Perspective IGP Based Best Path Selection  . . .   5
     2.2.  Client's Perspective Policy Based Best Path Selection . .   6
     2.3.  Solution Interactions . . . . . . . . . . . . . . . . . .   6
   3.  CPU and Memory Scalability  . . . . . . . . . . . . . . . . .   7
   4.  Advantages and Deployment Considerations  . . . . . . . . . .   8
   5.  Security Considerations . . . . . . . . . . . . . . . . . . .   9
   6.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .   9
   7.  Acknowledgments . . . . . . . . . . . . . . . . . . . . . . .   9
   8.  References  . . . . . . . . . . . . . . . . . . . . . . . . .   9
     8.1.  Normative References  . . . . . . . . . . . . . . . . . .   9
     8.2.  Informative References  . . . . . . . . . . . . . . . . .   9
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .  10

1.  Introduction

   There are three types of BGP deployments within Autonomous Systems
   today: full mesh, confederations and route reflection.  BGP route
   reflection [RFC4456] is the most popular way to distribute BGP routes
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