IPv4 Multicast over an IPv6 Multicast in Softwire Mesh Networks
RFC 8638

Document Type RFC - Proposed Standard (September 2019; No errata)
Last updated 2019-09-10
Replaces draft-xu-softwire-mesh-multicast
Stream IETF
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Stream WG state Submitted to IESG for Publication
Document shepherd Ian Farrer
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IESG IESG state RFC 8638 (Proposed Standard)
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Internet Engineering Task Force (IETF)                             M. Xu
Request for Comments: 8638                                        Y. Cui
Category: Standards Track                                          J. Wu
ISSN: 2070-1721                                      Tsinghua University
                                                                 S. Yang
                                                     Shenzhen University
                                                                 C. Metz
                                                           Cisco Systems
                                                          September 2019

    IPv4 Multicast over an IPv6 Multicast in Softwire Mesh Networks

Abstract

   During the transition to IPv6, there are scenarios where a backbone
   network internally running one IP address family (referred to as the
   internal IP or I-IP family) connects client networks running another
   IP address family (referred to as the external IP or E-IP family).
   In such cases, the I-IP backbone needs to offer both unicast and
   multicast transit services to the client E-IP networks.

   This document describes a mechanism for supporting multicast across
   backbone networks where the I-IP and E-IP protocol families differ.
   The document focuses on the IPv4-over-IPv6 scenario, due to lack of
   real-world use cases for the IPv6-over-IPv4 scenario.

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/rfc8638.

Xu, et al.                   Standards Track                    [Page 1]
RFC 8638                 Softwire Mesh Multicast          September 2019

Copyright Notice

   Copyright (c) 2019 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.  Requirements Language . . . . . . . . . . . . . . . . . . . .   5
   3.  Terminology . . . . . . . . . . . . . . . . . . . . . . . . .   5
   4.  Scope . . . . . . . . . . . . . . . . . . . . . . . . . . . .   6
   5.  Mesh Multicast Mechanism  . . . . . . . . . . . . . . . . . .   7
     5.1.  Mechanism Overview  . . . . . . . . . . . . . . . . . . .   7
     5.2.  Group Address Mapping . . . . . . . . . . . . . . . . . .   7
     5.3.  Source Address Mapping  . . . . . . . . . . . . . . . . .   8
     5.4.  Routing Mechanism . . . . . . . . . . . . . . . . . . . .   9
   6.  Control-Plane Functions of AFBR . . . . . . . . . . . . . . .  10
     6.1.  E-IP (*,G) and (S,G) State Maintenance  . . . . . . . . .  10
     6.2.  I-IP (S',G') State Maintenance  . . . . . . . . . . . . .  10
     6.3.  E-IP (S,G,rpt) State Maintenance  . . . . . . . . . . . .  10
     6.4.  Inter-AFBR Signaling  . . . . . . . . . . . . . . . . . .  10
     6.5.  SPT Switchover  . . . . . . . . . . . . . . . . . . . . .  13
     6.6.  Other PIM Message Types . . . . . . . . . . . . . . . . .  13
     6.7.  Maintenance of Other PIM States . . . . . . . . . . . . .  13
   7.  Data-Plane Functions of the AFBR  . . . . . . . . . . . . . .  13
     7.1.  Process and Forward Multicast Data  . . . . . . . . . . .  13
     7.2.  TTL or Hop Count  . . . . . . . . . . . . . . . . . . . .  14
     7.3.  Fragmentation . . . . . . . . . . . . . . . . . . . . . .  14
   8.  Packet Format and Translation . . . . . . . . . . . . . . . .  14
   9.  Softwire Mesh Multicast Encapsulation . . . . . . . . . . . .  16
   10. Security Considerations . . . . . . . . . . . . . . . . . . .  16
   11. IANA Considerations . . . . . . . . . . . . . . . . . . . . .  16
   12. Normative References  . . . . . . . . . . . . . . . . . . . .  16
   Acknowledgements  . . . . . . . . . . . . . . . . . . . . . . . .  18
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .  18

Xu, et al.                   Standards Track                    [Page 2]
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