Mobile IPv6 Fast Handovers for 802.11 Networks
RFC 4260

 
Document Type RFC - Informational (November 2005; No errata)
Last updated 2013-03-02
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IESG IESG state RFC 4260 (Informational)
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Responsible AD Margaret Wasserman
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Network Working Group                                         P. McCann
Request for Comments: 4260                          Lucent Technologies
Category: Informational                                   November 2005

            Mobile IPv6 Fast Handovers for 802.11 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 Internet Society (2005).

Abstract

   This document describes how a Mobile IPv6 Fast Handover could be
   implemented on link layers conforming to the 802.11 suite of
   specifications.

Table of Contents

   1. Introduction ....................................................2
      1.1. Conventions Used in This Document ..........................2
   2. Terminology .....................................................2
   3. Deployment Architectures for Mobile IPv6 on 802.11 ..............3
   4. 802.11 Handovers in Detail ......................................5
   5. FMIPv6 Message Exchanges ........................................7
   6. Beacon Scanning and NAR Discovery ...............................8
   7. Scenarios .......................................................9
      7.1. Scenario 1abcdef23456g .....................................9
      7.2. Scenario ab123456cdefg ....................................10
      7.3. Scenario 123456abcdefg ....................................10
   8. Security Considerations ........................................10
   9. Conclusions ....................................................12
   10. References ....................................................13
      10.1. Normative References .....................................13
      10.2. Informative References ...................................13
   11. Acknowledgements ..............................................13

McCann                       Informational                      [Page 1]
RFC 4260                  802.11 Fast Handover             November 2005

1.  Introduction

   The Mobile IPv6 Fast Handover protocol [2] has been proposed as a way
   to minimize the interruption in service experienced by a Mobile IPv6
   node as it changes its point of attachment to the Internet.  Without
   such a mechanism, a mobile node cannot send or receive packets from
   the time that it disconnects from one point of attachment in one
   subnet to the time it registers a new care-of address from the new
   point of attachment in a new subnet.  Such an interruption would be
   unacceptable for real-time services such as Voice-over-IP.

   The basic idea behind a Mobile IPv6 fast handover is to leverage
   information from the link-layer technology to either predict or
   rapidly respond to a handover event.  This allows IP connectivity to
   be restored at the new point of attachment sooner than would
   otherwise be possible.  By tunneling data between the old and new
   access routers, it is possible to provide IP connectivity in advance
   of actual Mobile IP registration with the home agent or correspondent
   node.  This allows real-time services to be reestablished without
   waiting for such Mobile IP registration to complete.  Because Mobile
   IP registration involves time-consuming Internet round-trips, the
   Mobile IPv6 fast handover can provide for a smaller interruption in
   real-time services than an ordinary Mobile IP handover.

   The particular link-layer information available, as well as the
   timing of its availability (before, during, or after a handover has
   occurred), differs according to the particular link-layer technology
   in use.  This document gives a set of deployment examples for Mobile
   IPv6 Fast Handovers on 802.11 networks.  We begin with a brief
   overview of relevant aspects of basic 802.11 [3].  We examine how and
   when handover information might become available to the IP layers
   that implement Fast Handover, both in the network infrastructure and
   on the mobile node.  Finally, we trace the protocol steps for Mobile
   IPv6 Fast Handover in this environment.

1.1.  Conventions Used in This Document

   The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT",
   "SHOULD", "SHOULD NOT", "RECOMMENDED",  "MAY", and "OPTIONAL" in this
   document are to be interpreted as described in RFC 2119 [1].

2.  Terminology

   This document borrows all of the terminology from Mobile IPv6 Fast
   Handovers [2], with the following additional terms from the 802.11
   specification [3] (some definitions slightly modified for clarity):

McCann                       Informational                      [Page 2]
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