Delivery of IPv4 Multicast Services to IPv4 Clients over an IPv6 Multicast Network
RFC 8114

Document Type RFC - Proposed Standard (March 2017; No errata)
Last updated 2017-03-17
Replaces draft-qin-softwire-dslite-multicast
Stream IETF
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Reviews GENART will not review this version
Stream WG state Submitted to IESG for Publication
Document shepherd Ian Farrer
Shepherd write-up Show (last changed 2016-11-04)
IESG IESG state RFC 8114 (Proposed Standard)
Consensus Boilerplate Yes
Telechat date
Responsible AD Terry Manderson
Send notices to (None)
IANA IANA review state Version Changed - Review Needed
IANA action state No IC
Internet Engineering Task Force (IETF)                      M. Boucadair
Request for Comments: 8114                                        Orange
Category: Standards Track                                         C. Qin
ISSN: 2070-1721                                                    Cisco
                                                            C. Jacquenet
                                                                  Orange
                                                                  Y. Lee
                                                                 Comcast
                                                                 Q. Wang
                                                           China Telecom
                                                              March 2017

        Delivery of IPv4 Multicast Services to IPv4 Clients over
                       an IPv6 Multicast Network

Abstract

   This document specifies a solution for the delivery of IPv4 multicast
   services to IPv4 clients over an IPv6 multicast network.  The
   solution relies upon a stateless IPv4-in-IPv6 encapsulation scheme
   and uses an IPv6 multicast distribution tree to deliver IPv4
   multicast traffic.  The solution is particularly useful for the
   delivery of multicast service offerings to customers serviced by
   Dual-Stack Lite (DS-Lite).

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
   http://www.rfc-editor.org/info/rfc8114.

Boucadair, et al.            Standards Track                    [Page 1]
RFC 8114                IPv4 over IPv6 Multicast              March 2017

Copyright Notice

   Copyright (c) 2017 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
   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.

Boucadair, et al.            Standards Track                    [Page 2]
RFC 8114                IPv4 over IPv6 Multicast              March 2017

Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   4
     1.1.  Requirements Language . . . . . . . . . . . . . . . . . .   5
   2.  Terminology . . . . . . . . . . . . . . . . . . . . . . . . .   5
   3.  Scope . . . . . . . . . . . . . . . . . . . . . . . . . . . .   6
   4.  Solution Overview . . . . . . . . . . . . . . . . . . . . . .   6
     4.1.  IPv4-Embedded IPv6 Prefixes . . . . . . . . . . . . . . .   7
     4.2.  Multicast Distribution Tree Computation . . . . . . . . .   8
     4.3.  Multicast Data Forwarding . . . . . . . . . . . . . . . .   9
   5.  IPv4/IPv6 Address Mapping . . . . . . . . . . . . . . . . . .   9
     5.1.  Prefix Assignment . . . . . . . . . . . . . . . . . . . .   9
     5.2.  Multicast Address Translation Algorithm . . . . . . . . .  10
     5.3.  Textual Representation  . . . . . . . . . . . . . . . . .  10
     5.4.  Examples  . . . . . . . . . . . . . . . . . . . . . . . .  10
   6.  Multicast B4 (mB4)  . . . . . . . . . . . . . . . . . . . . .  11
     6.1.  IGMP-MLD Interworking Function  . . . . . . . . . . . . .  11
     6.2.  Multicast Data Forwarding . . . . . . . . . . . . . . . .  12
     6.3.  Fragmentation . . . . . . . . . . . . . . . . . . . . . .  12
     6.4.  Host Built-In mB4 Function  . . . . . . . . . . . . . . .  12
     6.5.  Preserve the Scope  . . . . . . . . . . . . . . . . . . .  13
   7.  Multicast AFTR (mAFTR)  . . . . . . . . . . . . . . . . . . .  13
     7.1.  Routing Considerations  . . . . . . . . . . . . . . . . .  13
     7.2.  Processing PIM Messages . . . . . . . . . . . . . . . . .  14
     7.3.  Switching from Shared Tree to Shortest Path Tree  . . . .  15
     7.4.  Multicast Data Forwarding . . . . . . . . . . . . . . . .  15
     7.5.  Scope . . . . . . . . . . . . . . . . . . . . . . . . . .  15
   8.  Deployment Considerations . . . . . . . . . . . . . . . . . .  16
     8.1.  Other Operational Modes . . . . . . . . . . . . . . . . .  16
       8.1.1.  The IPv6 DR is Co-located with the mAFTR  . . . . . .  16
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