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ISP IPv6 Deployment Scenarios in Broadband Access Networks
RFC 4779

Network Working Group                                       S. Asadullah
Request for Comments: 4779                                      A. Ahmed
Category: Informational                                     C. Popoviciu
                                                           Cisco Systems
                                                               P. Savola
                                                               CSC/FUNET
                                                                J. Palet
                                                             Consulintel
                                                            January 2007

       ISP IPv6 Deployment Scenarios in Broadband Access Networks

Status of This Memo

   This memo provides information for the Internet community.  It does
   not specify an Internet standard of any kind.  Distribution of this
   memo is unlimited.

Copyright Notice

   Copyright (C) The IETF Trust (2007).

Abstract

   This document provides a detailed description of IPv6 deployment and
   integration methods and scenarios in today's Service Provider (SP)
   Broadband (BB) networks in coexistence with deployed IPv4 services.
   Cable/HFC, BB Ethernet, xDSL, and WLAN are the main BB technologies
   that are currently deployed, and discussed in this document.  The
   emerging Broadband Power Line Communications (PLC/BPL) access
   technology is also discussed for completeness.  In this document we
   will discuss main components of IPv6 BB networks, their differences
   from IPv4 BB networks, and how IPv6 is deployed and integrated in
   each of these networks using tunneling mechanisms and native IPv6.

Asadullah, et al.            Informational                      [Page 1]
RFC 4779          ISP IPv6 Deployment Scenarios in BB       January 2007

Table of Contents

   1.  Introduction . . . . . . . . . . . . . . . . . . . . . . . . .  4
   2.  Common Terminology . . . . . . . . . . . . . . . . . . . . . .  5
   3.  Core/Backbone Network  . . . . . . . . . . . . . . . . . . . .  5
     3.1.  Layer 2 Access Provider Network  . . . . . . . . . . . . .  5
     3.2.  Layer 3 Access Provider Network  . . . . . . . . . . . . .  6
   4.  Tunneling Overview . . . . . . . . . . . . . . . . . . . . . .  7
     4.1.  Access over Tunnels - Customers with Public IPv4
           Addresses  . . . . . . . . . . . . . . . . . . . . . . . .  7
     4.2.  Access over Tunnels - Customers with Private IPv4
           Addresses  . . . . . . . . . . . . . . . . . . . . . . . .  8
     4.3.  Transition a Portion of the IPv4 Infrastructure  . . . . .  8
   5.  Broadband Cable Networks . . . . . . . . . . . . . . . . . . .  9
     5.1.  Broadband Cable Network Elements . . . . . . . . . . . . .  9
     5.2.  Deploying IPv6 in Cable Networks . . . . . . . . . . . . . 10
       5.2.1.  Deploying IPv6 in a Bridged CMTS Network . . . . . . . 12
       5.2.2.  Deploying IPv6 in a Routed CMTS Network  . . . . . . . 14
       5.2.3.  IPv6 Multicast . . . . . . . . . . . . . . . . . . . . 23
       5.2.4.  IPv6 QoS . . . . . . . . . . . . . . . . . . . . . . . 24
       5.2.5.  IPv6 Security Considerations . . . . . . . . . . . . . 24
       5.2.6.  IPv6 Network Management  . . . . . . . . . . . . . . . 25
   6.  Broadband DSL Networks . . . . . . . . . . . . . . . . . . . . 26
     6.1.  DSL Network Elements . . . . . . . . . . . . . . . . . . . 26
     6.2.  Deploying IPv6 in IPv4 DSL Networks  . . . . . . . . . . . 28
       6.2.1.  Point-to-Point Model . . . . . . . . . . . . . . . . . 29
       6.2.2.  PPP Terminated Aggregation (PTA) Model . . . . . . . . 30
       6.2.3.  L2TPv2 Access Aggregation (LAA) Model  . . . . . . . . 33
       6.2.4.  Hybrid Model for IPv4 and IPv6 Service . . . . . . . . 36
     6.3.  IPv6 Multicast . . . . . . . . . . . . . . . . . . . . . . 38
       6.3.1.  ASM-Based Deployments  . . . . . . . . . . . . . . . . 39
       6.3.2.  SSM-Based Deployments  . . . . . . . . . . . . . . . . 39
     6.4.  IPv6 QoS . . . . . . . . . . . . . . . . . . . . . . . . . 40
     6.5.  IPv6 Security Considerations . . . . . . . . . . . . . . . 41
     6.6.  IPv6 Network Management  . . . . . . . . . . . . . . . . . 42
   7.  Broadband Ethernet Networks  . . . . . . . . . . . . . . . . . 42
     7.1.  Ethernet Access Network Elements . . . . . . . . . . . . . 42
     7.2.  Deploying IPv6 in IPv4 Broadband Ethernet Networks . . . . 43
       7.2.1.  Point-to-Point Model . . . . . . . . . . . . . . . . . 44
       7.2.2.  PPP Terminated Aggregation (PTA) Model . . . . . . . . 46
       7.2.3.  L2TPv2 Access Aggregation (LAA) Model  . . . . . . . . 48
       7.2.4.  Hybrid Model for IPv4 and IPv6 Service . . . . . . . . 50
     7.3.  IPv6 Multicast . . . . . . . . . . . . . . . . . . . . . . 52
     7.4.  IPv6 QoS . . . . . . . . . . . . . . . . . . . . . . . . . 53

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