Hierarchical Mobile IPv6 (HMIPv6) Mobility Management
RFC 5380

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Network Working Group                                         H. Soliman
Request for Comments: 5380                          Elevate Technologies
Obsoletes: 4140                                          C. Castelluccia
Category: Standards Track                                          INRIA
                                                              K. ElMalki
                                                                 Athonet
                                                              L. Bellier
                                                                   INRIA
                                                            October 2008

         Hierarchical Mobile IPv6 (HMIPv6) Mobility Management

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.

Abstract

   This document introduces extensions to Mobile IPv6 and IPv6 Neighbour
   Discovery to allow for local mobility handling.  Hierarchical
   mobility management for Mobile IPv6 is designed to reduce the amount
   of signalling between the mobile node, its correspondent nodes, and
   its home agent.  The Mobility Anchor Point (MAP) described in this
   document can also be used to improve the performance of Mobile IPv6
   in terms of handover speed.

Soliman, et al.             Standards Track                     [Page 1]
RFC 5380                         HMIPv6                     October 2008

Table of Contents

   1. Introduction ....................................................3
   2. Terminology .....................................................4
   3. Overview of HMIPv6 ..............................................5
      3.1. HMIPv6 Operations ..........................................6
   4. Mobile IPv6 Extension - Local Binding Update ....................9
   5. Neighbour Discovery Extension: The MAP Option ...................9
   6. Protocol Operation .............................................10
      6.1. Mobile Node Operation .....................................11
           6.1.1. Sending Packets to Correspondent Nodes .............12
      6.2. MAP Operations ............................................13
      6.3. Home Agent Operations .....................................13
      6.4. Correspondent Node Operations .............................13
      6.5. Local Mobility Management Optimisation within a
           MAP Domain ................................................14
      6.6. Location Privacy ..........................................14
   7. MAP Discovery ..................................................15
      7.1. Mobile Node Operation .....................................15
   8. Updating Previous MAPs .........................................16
   9. Note on MAP Selection by the Mobile Node .......................16
      9.1. MAP Selection in Distributed MAP Environment ..............17
      9.2. MAP Selection in a Flat Mobility Architecture .............18
   10. Detection and Recovery from MAP Failures ......................18
   11. Tunelling Impacts on MTU ......................................19
   12. Security Considerations .......................................19
      12.1. Mobile Node - MAP Security ...............................20
      12.2. Mobile Node - Correspondent Node Security ................22
      12.3. Mobile Node - Home Agent Security ........................22
   13. IANA Considerations ...........................................22
   14. Acknowledgements ..............................................22
   15. References ....................................................23
      15.1. Normative References .....................................23
      15.2. Informative References ...................................23
   Appendix A. Changes from RFC 4140 .................................24

Soliman, et al.             Standards Track                     [Page 2]
RFC 5380                         HMIPv6                     October 2008

1.  Introduction

   This specification introduces the concept of a hierarchical Mobile
   IPv6 network, utilising a new node called the Mobility Anchor Point
   (MAP).

   Mobile IPv6 [RFC3775] allows nodes to move within the Internet
   topology while maintaining reachability and ongoing connections
   between mobile and correspondent nodes.  To do this, a mobile node
   sends binding updates (BUs) to its home agent (HA) every time it
   moves.

   The mobile node may send data packets via its home agent immediately
   after sending the binding update, but the home agent will not be able
   to route traffic back to the mobile node before it receives the
   binding update.  This incurs at least half a round-trip delay before