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 2009Abstract
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
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