Network Working Group Q. Sun
Internet-Draft C. Xie
Intended status: Standards Track China Telecom
Expires: July 15, 2013 Y. Lee
Comcast
M. Chen
FreeBit
January 11, 2013
Deployment Considerations for Lightweight 4over6
draft-sun-softwire-lightweigh-4over6-deployment-03
Abstract
Lightweight 4over6 is a mechanism which moves the translation
function from tunnel Concentrator (AFTR) to Initiators (B4s), and
hence reduces the mapping scale on the Concentrator to per-customer
level. This document discusses various deployment models of
Lightweight 4over6. It also describes the deployment considerations
and applicability of the Lightweight 4over6 architecture.
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Internet-Draft lightweigh-4over6-deployment January 2013
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Table of Contents
1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . . 3
2. Requirements Language . . . . . . . . . . . . . . . . . . . . 4
3. Deployment Model . . . . . . . . . . . . . . . . . . . . . . . 5
4. Overall Deployment Considerations . . . . . . . . . . . . . . 7
4.1. Addressing and Routing . . . . . . . . . . . . . . . . . . 7
4.2. Port-set Management . . . . . . . . . . . . . . . . . . . 7
4.3. Concentrator Discovery . . . . . . . . . . . . . . . . . . 7
5. Concentrator Deployment Consideration . . . . . . . . . . . . 9
5.1. Logging at the Concentrator . . . . . . . . . . . . . . . 9
5.2. Reliability Considerations of Concentrator . . . . . . . . 9
5.3. Placement of AFTR . . . . . . . . . . . . . . . . . . . . 9
5.4. Port set algorithm consideration . . . . . . . . . . . . . 10
6. DS-Lite Compatibility . . . . . . . . . . . . . . . . . . . . 11
6.1. Case 1: Integrated Network Element with Lightweight
4over6 and DS-Lite AFTR Scenario . . . . . . . . . . . . . 11
6.2. Case 2: DS-Lite Coexistent scenario with Separated AFTR . 12
7. Acknowledgement . . . . . . . . . . . . . . . . . . . . . . . 13
8. References . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Appendix 1. Appendix:Experimental Result . . . . . . . . . . . . 16
1.1. Experimental environment . . . . . . . . . . . . . . . . . 16
1.2. Experimental results . . . . . . . . . . . . . . . . . . . 17
1.3. Conclusions . . . . . . . . . . . . . . . . . . . . . . . 18
Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . . 19
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1. Introduction
Lightweight 4over6 [I-D.cui-softwire-b4-translated-ds-lite] is an
extension to DS-Lite which simplifies the AFTR module [RFC6333] with
distributed NAT function among B4 elements. The Initiator in
Lightweight 4over6 is provisioned with an IPv6 address, an IPv4
datatracker.ietf.org