Host Multihoming with the Host Identity Protocol
RFC 8047

Document Type RFC - Proposed Standard (February 2017; No errata)
Last updated 2017-02-14
Stream IETF
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Stream WG state Submitted to IESG for Publication
Document shepherd Gonzalo Camarillo
Shepherd write-up Show (last changed 2016-06-14)
IESG IESG state RFC 8047 (Proposed Standard)
Consensus Boilerplate Yes
Telechat date
Responsible AD Terry Manderson
Send notices to "Gonzalo Camarillo" <gonzalo.camarillo@ericsson.com>
IANA IANA review state Version Changed - Review Needed
IANA action state No IC
Internet Engineering Task Force (IETF)                 T. Henderson, Ed.
Request for Comments: 8047                      University of Washington
Category: Standards Track                                        C. Vogt
ISSN: 2070-1721                                              Independent
                                                                J. Arkko
                                                                Ericsson
                                                           February 2017

            Host Multihoming with the Host Identity Protocol

Abstract

   This document defines host multihoming extensions to the Host
   Identity Protocol (HIP), by leveraging protocol components defined
   for host mobility.

Status of This Memo

   This is an Internet Standards Track document.

   This document is a product of the Internet Engineering Task Force
   (IETF).  It represents the consensus of the IETF community.  It has
   received public review and has been approved for publication by the
   Internet Engineering Steering Group (IESG).  Further information on
   Internet Standards is available in Section 2 of RFC 7841.

   Information about the current status of this document, any errata,
   and how to provide feedback on it may be obtained at
   http://www.rfc-editor.org/info/rfc8047.

Copyright Notice

   Copyright (c) 2017 IETF Trust and the persons identified as the
   document authors.  All rights reserved.

   This document is subject to BCP 78 and the IETF Trust's Legal
   Provisions Relating to IETF Documents
   (http://trustee.ietf.org/license-info) in effect on the date of
   publication of this document.  Please review these documents
   carefully, as they describe your rights and restrictions with respect
   to this document.  Code Components extracted from this document must
   include Simplified BSD License text as described in Section 4.e of
   the Trust Legal Provisions and are provided without warranty as
   described in the Simplified BSD License.

Henderson, et al.            Standards Track                    [Page 1]
RFC 8047                     HIP Multihoming               February 2017

Table of Contents

   1.  Introduction and Scope  . . . . . . . . . . . . . . . . . . .   3
   2.  Terminology and Conventions . . . . . . . . . . . . . . . . .   4
   3.  Protocol Model  . . . . . . . . . . . . . . . . . . . . . . .   4
   4.  Protocol Overview . . . . . . . . . . . . . . . . . . . . . .   4
     4.1.  Background  . . . . . . . . . . . . . . . . . . . . . . .   5
     4.2.  Usage Scenarios . . . . . . . . . . . . . . . . . . . . .   6
       4.2.1.  Multiple Addresses  . . . . . . . . . . . . . . . . .   6
       4.2.2.  Multiple Security Associations  . . . . . . . . . . .   6
       4.2.3.  Host Multihoming for Fault Tolerance  . . . . . . . .   7
       4.2.4.  Host Multihoming for Load Balancing . . . . . . . . .   9
       4.2.5.  Site Multihoming  . . . . . . . . . . . . . . . . . .  10
       4.2.6.  Dual-Host Multihoming . . . . . . . . . . . . . . . .  10
       4.2.7.  Combined Mobility and Multihoming . . . . . . . . . .  11
       4.2.8.  Initiating the Protocol in R1, I2, or R2  . . . . . .  11
       4.2.9.  Using LOCATOR_SETs across Addressing Realms . . . . .  13
     4.3.  Interaction with Security Associations  . . . . . . . . .  13
   5.  Processing Rules  . . . . . . . . . . . . . . . . . . . . . .  14
     5.1.  Sending LOCATOR_SETs  . . . . . . . . . . . . . . . . . .  14
     5.2.  Handling Received LOCATOR_SETs  . . . . . . . . . . . . .  16
     5.3.  Verifying Address Reachability  . . . . . . . . . . . . .  18
     5.4.  Changing the Preferred Locator  . . . . . . . . . . . . .  18
   6.  Security Considerations . . . . . . . . . . . . . . . . . . .  19
   7.  References  . . . . . . . . . . . . . . . . . . . . . . . . .  21
     7.1.  Normative References  . . . . . . . . . . . . . . . . . .  21
     7.2.  Informative References  . . . . . . . . . . . . . . . . .  21
   Acknowledgments . . . . . . . . . . . . . . . . . . . . . . . . .  22
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .  22

Henderson, et al.            Standards Track                    [Page 2]
RFC 8047                     HIP Multihoming               February 2017

1.  Introduction and Scope

   The Host Identity Protocol (HIP) [RFC7401] supports an architecture
   that decouples the transport layer (TCP, UDP, etc.) from the
   internetworking layer (IPv4 and IPv6) by using public/private key
   pairs, instead of IP addresses, as host identities.  When a host uses
   HIP, the overlying protocol sublayers (e.g., transport-layer sockets
   and Encapsulating Security Payload (ESP) Security Associations (SAs))
   are instead bound to representations of these host identities, and
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