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