IPv4 Multicast over an IPv6 Multicast in Softwire Mesh Network
draft-ietf-softwire-mesh-multicast-19

Document Type Active Internet-Draft (softwire WG)
Last updated 2017-11-15
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Softwire WG                                                        M. Xu
Internet-Draft                                                    Y. Cui
Intended status: Standards Track                                   J. Wu
Expires: May 19, 2018                                            S. Yang
                                                     Tsinghua University
                                                                 C. Metz
                                                             G. Shepherd
                                                           Cisco Systems
                                                       November 15, 2017

     IPv4 Multicast over an IPv6 Multicast in Softwire Mesh Network
                 draft-ietf-softwire-mesh-multicast-19

Abstract

   During IPv6 transition, there will be scenarios where a backbone
   network running one IP address family internally (referred to as
   internal IP or I-IP), while the attached client networks running
   another IP address family (referred to as external IP or E-IP).  The
   I-IP backbone should offer both unicast and multicast transit
   services to the client E-IP networks.

   This document describes the mechanism for supporting multicast across
   a set of E-IP and I-IP networks supporting softwire mesh.  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
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   Drafts is at https://datatracker.ietf.org/drafts/current/.

   Internet-Drafts are draft documents valid for a maximum of six months
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   material or to cite them other than as "work in progress."

   This Internet-Draft will expire on May 19, 2018.

Xu, et al.                Expires May 19, 2018                  [Page 1]
Internet-Draft           softwire mesh multicast           November 2017

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Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   3
     1.1.  Requirements Language . . . . . . . . . . . . . . . . . .   4
   2.  Terminology . . . . . . . . . . . . . . . . . . . . . . . . .   4
   3.  Scope . . . . . . . . . . . . . . . . . . . . . . . . . . . .   6
   4.  Mesh Multicast Mechanism  . . . . . . . . . . . . . . . . . .   7
     4.1.  Mechanism Overview  . . . . . . . . . . . . . . . . . . .   8
     4.2.  Group Address Mapping . . . . . . . . . . . . . . . . . .   8
     4.3.  Source Address Mapping  . . . . . . . . . . . . . . . . .   9
     4.4.  Routing Mechanism . . . . . . . . . . . . . . . . . . . .   9
   5.  Control Plane Functions of AFBR . . . . . . . . . . . . . . .  10
     5.1.  E-IP (*,G) and (S,G) State Maintenance  . . . . . . . . .  10
     5.2.  I-IP (S',G') State Maintenance  . . . . . . . . . . . . .  10
     5.3.  E-IP (S,G,rpt) State Maintenance  . . . . . . . . . . . .  11
     5.4.  Inter-AFBR Signaling  . . . . . . . . . . . . . . . . . .  11
     5.5.  SPT Switchover  . . . . . . . . . . . . . . . . . . . . .  13
     5.6.  Other PIM Message Types . . . . . . . . . . . . . . . . .  13
     5.7.  Other PIM States Maintenance  . . . . . . . . . . . . . .  13
   6.  Data Plane Functions of the AFBR  . . . . . . . . . . . . . .  13
     6.1.  Process and Forward Multicast Data  . . . . . . . . . . .  14
     6.2.  TTL . . . . . . . . . . . . . . . . . . . . . . . . . . .  14
     6.3.  Fragmentation . . . . . . . . . . . . . . . . . . . . . .  14
   7.  Packet Format and Translation . . . . . . . . . . . . . . . .  14
   8.  Softwire Mesh Multicast Encapsulation . . . . . . . . . . . .  15
   9.  Security Considerations . . . . . . . . . . . . . . . . . . .  16
   10. IANA Considerations . . . . . . . . . . . . . . . . . . . . .  16
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