Deployment Considerations for Lightweight 4over6
draft-ietf-softwire-lightweight-4over6-deployment-00

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Last updated 2017-01-25
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Network Working Group                                             Q. Sun
Internet-Draft                                                    C. Xie
Intended status: Informational                             China Telecom
Expires: July 29, 2017                                            Y. Lee
                                                                 Comcast
                                                                 M. Chen
                                                                 FreeBit
                                                                   T. Li
                                                     Tsinghua University
                                                        January 25, 2017

            Deployment Considerations for Lightweight 4over6
          draft-ietf-softwire-lightweight-4over6-deployment-00

Abstract

   Lightweight 4over6 is a mechanism which moves the translation
   function from tunnel lwAFTR (AFTR) to lwB4s (B4s), and hence reduces
   the mapping scale on the lwAFTR 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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   Copyright (c) 2017 IETF Trust and the persons identified as the
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   This document is subject to BCP 78 and the IETF Trust's Legal
   Provisions Relating to IETF Documents

Sun, et al.               Expires July 29, 2017                 [Page 1]
Internet-Draft        lightweigh-4over6-deployment          January 2017

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Table of Contents

   1.  Introduction . . . . . . . . . . . . . . . . . . . . . . . . .  3
   2.  Deployment Model . . . . . . . . . . . . . . . . . . . . . . .  4
   3.  Overall Deployment Considerations  . . . . . . . . . . . . . .  6
     3.1.  Addressing and Routing . . . . . . . . . . . . . . . . . .  6
     3.2.  Port-set Management  . . . . . . . . . . . . . . . . . . .  6
     3.3.  lwAFTR Discovery . . . . . . . . . . . . . . . . . . . . .  7
     3.4.  Impacts on Accouting . . . . . . . . . . . . . . . . . . .  7
   4.  lwAFTR Deployment Consideration  . . . . . . . . . . . . . . .  8
     4.1.  Logging at the lwAFTR  . . . . . . . . . . . . . . . . . .  8
     4.2.  MTU and Fragmentation Considerations . . . . . . . . . . .  8
     4.3.  Reliability Considerations of lwAFTR . . . . . . . . . . .  8
     4.4.  Placement of AFTR  . . . . . . . . . . . . . . . . . . . .  9
     4.5.  Port set algorithm consideration . . . . . . . . . . . . .  9
     4.6.  Path Consistency Consideration . . . . . . . . . . . . . .  9
   5.  lwB4 Deployment Consideration  . . . . . . . . . . . . . . . . 11
     5.1.  NAT traversal issue  . . . . . . . . . . . . . . . . . . . 11
     5.2.  Static Port Forwarding Configuration . . . . . . . . . . . 11
   6.  DS-Lite Compatibility Consideration  . . . . . . . . . . . . . 12
     6.1.  Case 1: Integrated Network Element with Lightweight
           4over6 and DS-Lite AFTR Scenario . . . . . . . . . . . . . 12
     6.2.  Case 2: DS-Lite Coexistent scenario with Separated AFTR  . 13
   7.  Acknowledgement  . . . . . . . . . . . . . . . . . . . . . . . 14
   8.  References . . . . . . . . . . . . . . . . . . . . . . . . . . 15
   Appendix 1.  China Telecom Experimental Result . . . . . . . . . . 18
     1.1.  Experimental Environment . . . . . . . . . . . . . . . . . 18
     1.2.  Experimental Results . . . . . . . . . . . . . . . . . . . 19
     1.3.  Conclusions  . . . . . . . . . . . . . . . . . . . . . . . 20
   Appendix 2.  Tsinghua University Experimental Result . . . . . . . 21
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