Low-Latency Handoffs in Mobile IPv4
RFC 4881
Document | Type | RFC - Experimental (June 2007; No errata) | |
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Author | Karim El Malki | ||
Last updated | 2015-10-14 | ||
Stream | Internent Engineering Task Force (IETF) | ||
Formats | plain text html pdf htmlized (tools) htmlized bibtex | ||
Stream | WG state | (None) | |
Document shepherd | No shepherd assigned | ||
IESG | IESG state | RFC 4881 (Experimental) | |
Action Holders |
(None)
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Consensus Boilerplate | Unknown | ||
Telechat date | |||
Responsible AD | Margaret Cullen | ||
Send notices to | (None) |
Network Working Group K. El Malki, Ed. Request for Comments: 4881 Athonet Category: Experimental June 2007 Low-Latency Handoffs in Mobile IPv4 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. Copyright Notice Copyright (C) The IETF Trust (2007). Abstract Mobile IPv4 describes how a Mobile Node can perform IPv4-layer handoffs between subnets served by different Foreign Agents. In certain cases, the latency involved in these handoffs can be above the threshold required for the support of delay-sensitive or real- time services. The aim of this document is to present two methods to achieve low-latency Mobile IPv4 handoffs. In addition, a combination of these two methods is described. The described techniques allow greater support for real-time services on a Mobile IPv4 network by minimizing the period of time when a Mobile Node is unable to send or receive IPv4 packets due to the delay in the Mobile IPv4 Registration process. Table of Contents 1. Introduction ....................................................3 1.1. Terminology ................................................4 1.2. The Techniques .............................................5 1.3. L2 Triggers ................................................7 1.4. Requirements Language ......................................9 2. Requirements ....................................................9 3. The PRE-REGISTRATION Handoff Method ............................10 3.1. Operation .................................................11 3.2. Network-Initiated Handoff .................................13 3.3. Mobile-Initiated Handoff ..................................15 3.4. Obtaining and Proxying nFA Advertisements .................17 3.4.1. Inter-FA Solicitation ..............................17 3.4.2. Tunneled nFA Advertisements ........................18 3.5. Caching Router Advertisements .............................19 El Malki, Ed. Experimental [Page 1] RFC 4881 Low-Latency Mobile IPv4 Handoffs June 2007 3.6. Movement Detection, MN, and FA Considerations .............19 3.7. L2 Address Considerations .................................21 3.8. Applicability of PRE-REGISTRATION Handoff .................21 4. The POST-REGISTRATION Handoff Method ...........................23 4.1. Two-Party Handoff .........................................24 4.2. Three-Party Handoff .......................................28 4.3. Renewal or Termination of Tunneling Service ...............34 4.4. When Will the MN Perform a Mobile IPv4 Registration? ......34 4.5. Handoff Request (HRqst) Message Format ....................36 4.6. Handoff Reply (HRply) Message Format ......................38 4.7. Handoff to Third (HTT) Message Format .....................40 4.8. Applicability of POST-REGISTRATION Handoff Method .........40 5. Combined Handoff Method ........................................41 6. Layer 2 and Layer 3 Handoff Timing Considerations ..............42 7. Reverse Tunneling Support ......................................42 8. Handoff Signaling Failure Recovery .............................43 8.1. PRE-REGISTRATION Signaling Failure Recovery ...............43 8.1.1. Failure of PrRtSol and PrRtAdv .....................43 8.1.2. Failure of Inter-FA Solicitation and Advertisement ......................................44 8.2. POST-REGISTRATION Signaling Failure Recovery ..............44 8.2.1. HRqst Message Dropped ..............................44 8.2.2. HRply Message Dropped ..............................45 9. Generalized Link Layer and IPv4 Address (LLA) Extension ........46 9.1. 3GPP2 IMSI Link Layer Address and Connection ID Extension .................................................47 9.2. 3GPP IMSI Link Layer Address Extension ....................48 9.3. Ethernet Link Layer Address Extension .....................49 9.4. IEEE 64-Bit Global Identifier (EUI-64) Address Extension ..50 9.5. Solicited IPv4 Address Extension ..........................51 9.6. Access Point Identifier Extension .........................52 9.7. FA IPv4 Address Extension .................................53 10. IANA Considerations ...........................................53 10.1. New Extension Values .....................................53 10.2. Generalized Link Layer and IP Address Identifier (LLA) ...54Show full document text