IPv4 Multicast over an IPv6 Multicast in Softwire Mesh Network
draft-ietf-softwire-mesh-multicast-22

Document Type Active Internet-Draft (softwire WG)
Last updated 2018-06-29 (latest revision 2018-06-18)
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Softwire WG                                                        M. Xu
Internet-Draft                                                    Y. Cui
Intended status: Standards Track                                   J. Wu
Expires: December 20, 2018                           Tsinghua University
                                                                 S. Yang
                                                             Oudmon Tech
                                                                 C. Metz
                                                           Cisco Systems
                                                           June 18, 2018

     IPv4 Multicast over an IPv6 Multicast in Softwire Mesh Network
                 draft-ietf-softwire-mesh-multicast-22

Abstract

   During the transition to IPv6, there will be 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 IPv4-over-IPv6 scenario, due to lack of real-
   world use cases for IPv6-over-IPv4 scenario.

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
   Task Force (IETF).  Note that other groups may also distribute
   working documents as Internet-Drafts.  The list of current Internet-
   Drafts is at https://datatracker.ietf.org/drafts/current/.

   Internet-Drafts are draft documents valid for a maximum of six months
   and may be updated, replaced, or obsoleted by other documents at any
   time.  It is inappropriate to use Internet-Drafts as reference
   material or to cite them other than as "work in progress."

   This Internet-Draft will expire on December 20, 2018.

Xu, et al.              Expires December 20, 2018               [Page 1]
Internet-Draft           softwire mesh multicast               June 2018

Copyright Notice

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   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.  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.  Other PIM States Maintenance  . . . . . . . . . . . . . .  13
   7.  Data Plane Functions of the AFBR  . . . . . . . . . . . . . .  13
     7.1.  Process and Forward Multicast Data  . . . . . . . . . . .  13
     7.2.  TTL . . . . . . . . . . . . . . . . . . . . . . . . . . .  14
     7.3.  Fragmentation . . . . . . . . . . . . . . . . . . . . . .  14
   8.  Packet Format and Translation . . . . . . . . . . . . . . . .  14
   9.  Softwire Mesh Multicast Encapsulation . . . . . . . . . . . .  15
   10. Security Considerations . . . . . . . . . . . . . . . . . . .  16
   11. IANA Considerations . . . . . . . . . . . . . . . . . . . . .  16
   12. References  . . . . . . . . . . . . . . . . . . . . . . . . .  16
     12.1.  Normative References . . . . . . . . . . . . . . . . . .  16
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