Softwire Hub and Spoke Deployment Framework with Layer Two Tunneling Protocol Version 2 (L2TPv2)
RFC 5571

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Network Working Group                                          B. Storer
Request for Comments: 5571                             C. Pignataro, Ed.
Category: Standards Track                                  M. Dos Santos
                                                           Cisco Systems
                                                         B. Stevant, Ed.
                                                              L. Toutain
                                                        TELECOM Bretagne
                                                             J. Tremblay
                                                          Videotron Ltd.
                                                               June 2009

              Softwire Hub and Spoke Deployment Framework
          with Layer Two Tunneling Protocol Version 2 (L2TPv2)

Status of This Memo

   This document specifies an Internet standards track protocol for the
   Internet community, and requests discussion and suggestions for
   improvements.  Please refer to the current edition of the "Internet
   Official Protocol Standards" (STD 1) for the standardization state
   and status of this protocol.  Distribution of this memo is unlimited.

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Storer, et al.              Standards Track                     [Page 1]
RFC 5571          Softwire H & S Framework with L2TPv2         June 2009

Abstract

   This document describes the framework of the Softwire "Hub and Spoke"
   solution with the Layer Two Tunneling Protocol version 2 (L2TPv2).
   The implementation details specified in this document should be
   followed to achieve interoperability among different vendor
   implementations.

Table of Contents

   1. Introduction ....................................................4
      1.1. Abbreviations ..............................................5
      1.2. Requirements Language ......................................5
      1.3. Considerations .............................................6
   2. Applicability of L2TPv2 for Softwire Requirements ...............6
      2.1. Traditional Network Address Translation (NAT and NAPT) .....6
      2.2. Scalability ................................................7
      2.3. Routing ....................................................7
      2.4. Multicast ..................................................7
      2.5. Authentication, Authorization, and Accounting (AAA) ........7
      2.6. Privacy, Integrity, and Replay Protection ..................7
      2.7. Operations and Management ..................................8
      2.8. Encapsulations .............................................8
   3. Deployment Scenarios ............................................8
      3.1. IPv6-over-IPv4 Softwires with L2TPv2 .......................9
           3.1.1. Host CPE as Softwire Initiator ......................9
           3.1.2. Router CPE as Softwire Initiator ...................10
           3.1.3. Host behind CPE as Softwire Initiator ..............11
           3.1.4. Router behind CPE as Softwire Initiator ............12
      3.2. IPv4-over-IPv6 Softwires with L2TPv2 ......................14
           3.2.1. Host CPE as Softwire Initiator .....................14
           3.2.2. Router CPE as Softwire Initiator ...................15
           3.2.3. Host behind CPE as Softwire Initiator ..............16
           3.2.4. Router behind CPE as Softwire Initiator ............16
   4. References to Standardization Documents ........................17
      4.1. L2TPv2 ....................................................18
      4.2. Securing the Softwire Transport ...........................18
      4.3. Authentication, Authorization, and Accounting .............18
      4.4. MIB .......................................................18