Multicast VPN Using Bit Index Explicit Replication (BIER)
RFC 8556

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Internet Engineering Task Force (IETF)                     E. Rosen, Ed.
Request for Comments: 8556                                  M. Sivakumar
Category: Standards Track                                  T. Przygienda
ISSN: 2070-1721                                   Juniper Networks, Inc.
                                                               S. Aldrin
                                                            Google, Inc.
                                                             A. Dolganow
                                                                   Nokia
                                                              April 2018

       Multicast VPN Using Bit Index Explicit Replication (BIER)

Abstract

   The Multicast Virtual Private Network (MVPN) specifications require
   the use of multicast tunnels ("P-tunnels") that traverse a service
   provider's backbone network.  The P-tunnels are used for carrying
   multicast traffic across the backbone.  A variety of P-tunnel types
   are supported.  Bit Index Explicit Replication (BIER) is a new
   architecture that provides optimal multicast forwarding through a
   "multicast domain", without requiring intermediate routers to
   maintain any per-flow state or to engage in an explicit tree-building
   protocol.  This document specifies the protocol and procedures that
   allow MVPN to use BIER as the method of carrying multicast traffic
   over a service provider's backbone network.

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 7841.

   Information about the current status of this document, any errata,
   and how to provide feedback on it may be obtained at
   https://www.rfc-editor.org/info/rfc8556.

Rosen, et al.                Standards Track                    [Page 1]
RFC 8556                     MVPN with BIER                   April 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
   Provisions Relating to IETF Documents

   (https://trustee.ietf.org/license-info) in effect on the date of
   publication of this document.  Please review these documents
   carefully, as they describe your rights and restrictions with respect
   to this document.  Code Components extracted from this document must
   include Simplified BSD License text as described in Section 4.e of
   the Trust Legal Provisions and are provided without warranty as
   described in the Simplified BSD License.

Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   3
   2.  Use of the PMSI Tunnel Attribute in x-PMSI A-D Routes . . . .   5
     2.1.  MPLS Label  . . . . . . . . . . . . . . . . . . . . . . .   7
     2.2.  Explicit Tracking . . . . . . . . . . . . . . . . . . . .   9
       2.2.1.  Using the LIR Flag  . . . . . . . . . . . . . . . . .  10
       2.2.2.  Using the LIR-pF Flag . . . . . . . . . . . . . . . .  10
   3.  Use of the PMSI Tunnel Attribute in Leaf A-D Routes . . . . .  11
   4.  Data Plane  . . . . . . . . . . . . . . . . . . . . . . . . .  12
     4.1.  Encapsulation and Transmission  . . . . . . . . . . . . .  12
     4.2.  Disposition . . . . . . . . . . . . . . . . . . . . . . .  14
       4.2.1.  At a BFER That Is an Egress PE  . . . . . . . . . . .  14
       4.2.2.  At a BFER That Is a P-tunnel Segmentation Boundary  .  14
   5.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .  15
   6.  Security Considerations . . . . . . . . . . . . . . . . . . .  15
   7.  References  . . . . . . . . . . . . . . . . . . . . . . . . .  15
     7.1.  Normative References  . . . . . . . . . . . . . . . . . .  15
     7.2.  Informative References  . . . . . . . . . . . . . . . . .  16
   Acknowledgments . . . . . . . . . . . . . . . . . . . . . . . . .  16
   Contributors  . . . . . . . . . . . . . . . . . . . . . . . . . .  16
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .  17

Rosen, et al.                Standards Track                    [Page 2]
RFC 8556                     MVPN with BIER                   April 2018

1.  Introduction

   [RFC6513] and [RFC6514] specify the protocols and procedures that a
   Service Provider (SP) can use to provide Multicast Virtual Private
   Network (MVPN) service to its customers.  Multicast tunnels are
   created through an SP's backbone network; these are known as
   "P-tunnels".  The P-tunnels are used for carrying multicast traffic
   across the backbone.  The MVPN specifications allow the use of
   several different kinds of P-tunnel technology.