Failure Detection and Locator Pair Exploration Protocol for IPv6 Multihoming
RFC 5534

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Network Working Group                                           J. Arkko
Request for Comments: 5534                                      Ericsson
Category: Standards Track                                 I. van Beijnum
                                                          IMDEA Networks
                                                               June 2009

                   Failure Detection and Locator Pair
               Exploration Protocol for IPv6 Multihoming

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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Abstract

   This document specifies how the level 3 multihoming Shim6 protocol
   (Shim6) detects failures between two communicating nodes.  It also
   specifies an exploration protocol for switching to another pair of
   interfaces and/or addresses between the same nodes if a failure
   occurs and an operational pair can be found.

Arkko & Van Beijnum         Standards Track                     [Page 1]
RFC 5534         Failure Detection/Exploration Protocol        June 2009

Table of Contents

   1. Introduction ....................................................3
   2. Requirements Language ...........................................4
   3. Definitions .....................................................4
      3.1. Available Addresses ........................................4
      3.2. Locally Operational Addresses ..............................5
      3.3. Operational Address Pairs ..................................5
      3.4. Primary Address Pair .......................................7
      3.5. Current Address Pair .......................................7
   4. Protocol Overview ...............................................8
      4.1. Failure Detection ..........................................8
      4.2. Full Reachability Exploration .............................10
      4.3. Exploration Order .........................................11
   5. Protocol Definition ............................................13
      5.1. Keepalive Message .........................................13
      5.2. Probe Message .............................................14
      5.3. Keepalive Timeout Option Format ...........................18
   6. Behavior .......................................................19
      6.1. Incoming Payload Packet ...................................20
      6.2. Outgoing Payload Packet ...................................21
      6.3. Keepalive Timeout .........................................21
      6.4. Send Timeout ..............................................22
      6.5. Retransmission ............................................22
      6.6. Reception of the Keepalive Message ........................22
      6.7. Reception of the Probe Message State=Exploring ............23
      6.8. Reception of the Probe Message State=InboundOk ............23
      6.9. Reception of the Probe Message State=Operational ..........23
      6.10. Graphical Representation of the State Machine ............24
   7. Protocol Constants and Variables ...............................24
   8. Security Considerations ........................................25
   9. Operational Considerations .....................................27
   10. References ....................................................28
      10.1. Normative References .....................................28
      10.2. Informative References ...................................29
   Appendix A. Example Protocol Runs..................................30