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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