Prefix Limit Based ORF for BGP-4
draft-keyur-idr-bgp-prefix-limit-orf-00

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IDR                                                             K. Patel
Internet-Draft                                               Arrcus, Inc
Intended status: Standards Track                              J. Scudder
Expires: May 4, 2017                                    Juniper Networks
                                                             M. Marzetti
                                                             PCCW Global
                                                                J. Heitz
                                                                   Cisco
                                                        October 31, 2016

                    Prefix Limit Based ORF for BGP-4
              draft-keyur-idr-bgp-prefix-limit-orf-00.txt

Abstract

   The BGP specification allows for "the ability to impose an (locally
   configured) upper bound on the number of address prefixes the speaker
   is willing to accept from a neighbor".  In this specification, we
   define a new Outbound Route Filter type for BGP, termed "Prefix Limit
   Outbound Route Filter", which the speaker can use to communicate that
   upper bound to its peer.  The peer is then required to abide by the
   limit.  This is expected to have benefits in terms of resource
   consumption and more importantly, transparency of operation.

Status of This Memo

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Copyright Notice

   Copyright (c) 2016 IETF Trust and the persons identified as the
   document authors.  All rights reserved.

Patel, et al.              Expires May 4, 2017                  [Page 1]
Internet-Draft      Prefix Limit Based ORF for BGP-4        October 2016

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Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
   2.  Prefix Limit ORF-Type . . . . . . . . . . . . . . . . . . . .   2
   3.  Prefix Limit ORF encoding . . . . . . . . . . . . . . . . . .   3
   4.  Capability Specification for Cooperative route filtering with
       Prefix Limit  . . . . . . . . . . . . . . . . . . . . . . . .   3
   5.  Rules for Prefix Limit ORF  . . . . . . . . . . . . . . . . .   3
     5.1.  Rules for Sending Speaker . . . . . . . . . . . . . . . .   4
       5.1.1.  Enforcing the Prefix Limit  . . . . . . . . . . . . .   4
     5.2.  Rules for Receiving Speaker . . . . . . . . . . . . . . .   5
   6.  Error handling  . . . . . . . . . . . . . . . . . . . . . . .   6
   7.  Security Considerations . . . . . . . . . . . . . . . . . . .   6
   8.  Acknowledgements  . . . . . . . . . . . . . . . . . . . . . .   6
   9.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .   6
   10. Normative References  . . . . . . . . . . . . . . . . . . . .   6
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .   7

1.  Introduction

   The Cooperative Outbound Route Filtering Capability defined in
   [RFC5291] provides a mechanism for a BGP speaker to send to its BGP
   neighbor a set of Outbound Route Filters (ORFs) that can be used by
   its neighbor to filter its outbound routing updates to the speaker.

   This documents defines a new ORF-type for BGP, termed "Prefix Limit
   Outbound Route Filter (PrefixLimit ORF)", that can be used to perform
   Prefix Limit based route filtering.  This filtering mechanism imposes
   a limit on a the number of unique prefixes that the BGP speaker can
   advertise to its neighbor.

2.  Prefix Limit ORF-Type

   The Prefix Limit ORF-Type allows a BGP speaker to inform its neighbor
   of its prefix limits.  That is, it provides a mechanism through which
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