Softwire WG J. Qin
Internet-Draft Cisco
Intended status: Standards Track M. Boucadair
Expires: October 17, 2013 C. Jacquenet
France Telecom
Y. Lee
Comcast
Q. Wang
China Telecom
April 15, 2013
Delivery of IPv4 Multicast Services to IPv4 Clients over an IPv6
Multicast Network
draft-ietf-softwire-dslite-multicast-05
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 the IPv6 multicast distribution tree to deliver IPv4
multicast traffic. The solution is particularly useful for the
delivery of multicast service offerings to DS-Lite serviced
customers.
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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Internet-Drafts are draft documents valid for a maximum of six months
and may be updated, replaced, or obsoleted by other documents at any
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material or to cite them other than as "work in progress."
This Internet-Draft will expire on October 17, 2013.
Qin, et al. Expires October 17, 2013 [Page 1]
Internet-Draft IPv4 over IPv6 Multicast April 2013
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Table of Contents
1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . 3
1.1. Requirements Language . . . . . . . . . . . . . . . . . . 4
2. Terminology . . . . . . . . . . . . . . . . . . . . . . . . . 4
3. Scope . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
4. Solution Overview . . . . . . . . . . . . . . . . . . . . . . 5
4.1. IPv4-Embedded IPv6 Prefixes . . . . . . . . . . . . . . . 6
4.2. Multicast Distribution Tree Computation . . . . . . . . . 6
4.3. Multicast Data Forwarding . . . . . . . . . . . . . . . . 7
5. Address Mapping . . . . . . . . . . . . . . . . . . . . . . . 8
5.1. Prefix Assignment . . . . . . . . . . . . . . . . . . . . 8
5.2. Address Translation Algorithm . . . . . . . . . . . . . . 9
5.3. Textual Representation . . . . . . . . . . . . . . . . . 9
5.4. Examples . . . . . . . . . . . . . . . . . . . . . . . . 9
6. Multicast B4 (mB4) . . . . . . . . . . . . . . . . . . . . . 9
6.1. IGMP-MLD Interworking Function . . . . . . . . . . . . . 10
6.2. Multicast Data Forwarding . . . . . . . . . . . . . . . . 10
6.3. Fragmentation . . . . . . . . . . . . . . . . . . . . . . 11
6.4. Host built-in mB4 Function . . . . . . . . . . . . . . . 11
6.5. Preserve the Scope . . . . . . . . . . . . . . . . . . . 11
7. Multicast AFTR (mAFTR) . . . . . . . . . . . . . . . . . . . 11
7.1. Routing Considerations . . . . . . . . . . . . . . . . . 11
7.2. Processing PIM Message . . . . . . . . . . . . . . . . . 12
7.3. Switching from Shared Tree to Shortest Path Tree . . . . 13
7.4. Multicast Data Forwarding . . . . . . . . . . . . . . . . 13
7.5. TTL/Scope . . . . . . . . . . . . . . . . . . . . . . . . 13
8. Security Considerations . . . . . . . . . . . . . . . . . . . 14
8.1. Firewall Configuration . . . . . . . . . . . . . . . . . 14
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