BIER Penultimate Hop Popping
draft-zzhang-bier-php-01

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BIER                                                            Z. Zhang
Internet-Draft                                          Juniper Networks
Intended status: Standards Track                          August 3, 2018
Expires: February 4, 2019

                      BIER Penultimate Hop Popping
                        draft-zzhang-bier-php-01

Abstract

   Bit Index Explicit Replication (BIER) can be used as provider tunnel
   for MVPN/GTM [RFC6514] [RFC7716] or EVPN BUM [RFC7432].  It is
   possible that not all routers in the provider network support BIER
   and there are various methods to handle BIER incapable transit
   routers.  However the MVPN/EVPN PEs are assumed to be BIER capable -
   they are BFIRs/BFERs.  This document specifies a method to allow BIER
   incapable routers to act as MVPN/EVPN PEs with BIER as the transport,
   by having the upstream BFR (connected directly or indirectly via a
   tunnel) of a PE remove the BIER header and send the payload to the
   PE.

Requirements Language

   The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT",
   "SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and "OPTIONAL" in this
   document are to be interpreted as described in RFC2119.

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 February 4, 2019.

Zhang                   Expires February 4, 2019                [Page 1]
Internet-Draft                  bier-php                     August 2018

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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Table of Contents

   1.  Terminologies . . . . . . . . . . . . . . . . . . . . . . . .   2
   2.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
   3.  Specifications  . . . . . . . . . . . . . . . . . . . . . . .   3
   4.  Security Considerations . . . . . . . . . . . . . . . . . . .   4
   5.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .   5
   6.  Acknowledgements  . . . . . . . . . . . . . . . . . . . . . .   5
   7.  References  . . . . . . . . . . . . . . . . . . . . . . . . .   5
     7.1.  Normative References  . . . . . . . . . . . . . . . . . .   5
     7.2.  Informative References  . . . . . . . . . . . . . . . . .   6
   Author's Address  . . . . . . . . . . . . . . . . . . . . . . . .   7

1.  Terminologies

   Familiarity with BIER/MVPN/EVPN protocols and procedures is assumed.
   Some terminologies are listed below for convenience.

   [To be added].

2.  Introduction

   The BIER architecture includes three layers: the "routing underlay",
   the "BIER layer", and the "multicast flow overlay".  The multicast
   flow overlay is responsible for the BFERs to signal to BFIRs that
   they are interested in receiving certain multicast flows so that
   BFIRs can encode the correct bitstring for BIER forwarding by the
   BIER layer.

   MVPN and EVPN are two similar overlays where BGP Auto-Discovery
   routes for MVPN/EVPN are exchanged among all PEs to signal which PEs
   need to receive multicast traffic for all or certain flows.

Zhang                   Expires February 4, 2019                [Page 2]
Internet-Draft                  bier-php                     August 2018

   Typically the same provider tunnel type is used for traffic to reach
   all receiving PEs.

   Consider an MVPN/EVPN deployment where enough P/PE routers are BIER
   capable for BIER to become the preferred the choice of provider
   tunnel.  However, some PEs cannot be upgraded to support BIER
   forwarding.  While there are ways to allow an ingress PE to send
   traffic to some PEs with one type of tunnel and send traffic to some
   other PEs with a different type of tunnel, the procedure becomes
   complicated and forwarding is not optimized.
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