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Mobile IPv4 Fast Handovers
RFC 4988

Document type: RFC - Experimental (October 2007)
Document stream: IETF
Last updated: 2013-03-02
Other versions: plain text, pdf, html

IETF State: (None)
Consensus: Unknown
Document shepherd: No shepherd assigned

IESG State: RFC 4988 (Experimental)
Responsible AD: Jari Arkko
Send notices to: mip4-chairs@tools.ietf.org,draft-ietf-mip4-fmipv4@tools.ietf.org

Network Working Group                                          R. Koodli
Request for Comments: 4988                                    C. Perkins
Category: Experimental                            Nokia Siemens Networks
                                                            October 2007

                       Mobile IPv4 Fast Handovers

Status of This Memo

   This memo defines an Experimental Protocol for the Internet
   community.  It does not specify an Internet standard of any kind.
   Discussion and suggestions for improvement are requested.
   Distribution of this memo is unlimited.

Abstract

   This document adapts the Mobile IPv6 Fast Handovers to improve delay
   and packet loss resulting from Mobile IPv4 handover operations.
   Specifically, this document addresses movement detection, IP address
   configuration, and location update latencies during a handover.  For
   reducing the IP address configuration latency, the document proposes
   that the new Care-of Address is always made to be the new access
   router's IP address.

Koodli & Perkins              Experimental                      [Page 1]
RFC 4988                  MIP4 Fast Handovers               October 2007

Table of Contents

   1. Introduction ....................................................3
   2. Terminology .....................................................4
   3. Factors Affecting Handover ......................................5
   4. Protocol ........................................................6
      4.1. Overview ...................................................6
      4.2. Operation ..................................................7
   5. Message Formats ................................................10
      5.1. Fast Binding Update (FBU) .................................10
      5.2. Fast Binding Acknowledgment (FBAck) .......................12
      5.3. Router Solicitation for Proxy Advertisement (RtSolPr) .....13
      5.4. Proxy Router Advertisement (PrRtAdv) ......................14
      5.5. Handover Initiate (HI) ....................................17
      5.6. Handover Acknowledge (HAck) ...............................19
   6. Option Formats .................................................20
      6.1. Link-Layer Address Option Format ..........................20
      6.2. New IPv4 Address Option Format ............................22
      6.3. New Router Prefix Information Option ......................22
   7. Security Considerations ........................................23
   8. IANA Considerations ............................................24
   9. Acknowledgments ................................................25
   10. References ....................................................25
      10.1. Normative References .....................................25
      10.2. Informative References ...................................26

Koodli & Perkins              Experimental                      [Page 2]
RFC 4988                  MIP4 Fast Handovers               October 2007

1.  Introduction

   This document adapts the fast handover specification [rfc4068] to
   IPv4 networks.  The fast handover protocol specified in this document
   is particularly interesting for operation over links such as IEEE 802
   wireless links.  Fast handovers are not typically needed for wired
   media due to the relatively large delays attributable to establishing
   new connections in today's wired networks.  Mobile IPv4 [rfc3344]
   registration messages are reused (with new type numbers) in this
   document to enable faster implementation using existing Mobile IPv4
   software.  This document does not require link-layer triggers for
   protocol operation, but performance will typically be enhanced by
   using the appropriate triggers when they are available.  This
   document assumes that the reader is familiar with the basic operation
   and terminology of Mobile IPv4 [rfc3344] and Fast Handovers for
   Mobile IPv6 [rfc4068].

   The active agents that enable continued packet delivery to a mobile
   node (MN) are the access routers on the networks that the mobile node
   connects to.  Handover means that the mobile node changes its network
   connection, and we consider the scenario in which this change means
   change in access routers.  The mobile node utilizes the access
   routers as default routers in the normal sense, but also as partners
   in mobility management.  Thus, when the mobile node moves to a new
   network, it processes handover-related signaling in order to identify
   and develop a relationship with a new access router.  In this
   document, we call the previous access router PAR and the new access
   router NAR, consistent with the terminology in [rfc4068].  Unless

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