Route Information Options in IPv6 Neighbor Discovery
draft-templin-6man-rio-redirect-05

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Last updated 2017-10-30
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Network Working Group                                    F. Templin, Ed.
Internet-Draft                              Boeing Research & Technology
Updates: rfc4191 (if approved)                               J. Woodyatt
Intended status: Standards Track                                  Google
Expires: May 3, 2018                                    October 30, 2017

          Route Information Options in IPv6 Neighbor Discovery
                 draft-templin-6man-rio-redirect-05.txt

Abstract

   The IPv6 Neighbor Discovery (ND) protocol allows nodes to discover
   neighbors on the same link.  Router Advertisement (RA) messages can
   also convey routing information by including a non-zero (default)
   Router Lifetime, and/or Route Information Options (RIOs).  This
   document specifies backward-compatible extensions that permit nodes
   to include RIOs in other IPv6 ND messages to support the discovery of
   more-specific routes.

Status of This Memo

   This Internet-Draft is submitted in full conformance with the
   provisions of BCP 78 and BCP 79.

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   This Internet-Draft will expire on May 3, 2018.

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   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
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Templin & Woodyatt         Expires May 3, 2018                  [Page 1]
Internet-Draft              RIOs in Redirects               October 2017

   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.

Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
   2.  Terminology . . . . . . . . . . . . . . . . . . . . . . . . .   3
   3.  Motivation  . . . . . . . . . . . . . . . . . . . . . . . . .   3
   4.  Route Information Options (RIOs) in IPv6 Neighbor Discovery
       Messages  . . . . . . . . . . . . . . . . . . . . . . . . . .   5
     4.1.  RIO Update  . . . . . . . . . . . . . . . . . . . . . . .   5
     4.2.  RIO Requirements  . . . . . . . . . . . . . . . . . . . .   7
     4.3.  Classic Redirection Scenario  . . . . . . . . . . . . . .   7
     4.4.  RIO Redirection Scenario  . . . . . . . . . . . . . . . .   9
       4.4.1.  Router Specification  . . . . . . . . . . . . . . . .   9
       4.4.2.  Source Specification  . . . . . . . . . . . . . . . .  10
       4.4.3.  Target Specification  . . . . . . . . . . . . . . . .  11
     4.5.  Operation Without Redirects . . . . . . . . . . . . . . .  11
     4.6.  Multiple RIOs . . . . . . . . . . . . . . . . . . . . . .  12
     4.7.  Multicast . . . . . . . . . . . . . . . . . . . . . . . .  12
     4.8.  Why NS/NA?  . . . . . . . . . . . . . . . . . . . . . . .  12
   5.  Implementation Status . . . . . . . . . . . . . . . . . . . .  13
   6.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .  13
   7.  Security Considerations . . . . . . . . . . . . . . . . . . .  14
   8.  Acknowledgements  . . . . . . . . . . . . . . . . . . . . . .  15
   9.  References  . . . . . . . . . . . . . . . . . . . . . . . . .  15
     9.1.  Normative References  . . . . . . . . . . . . . . . . . .  15
     9.2.  Informative References  . . . . . . . . . . . . . . . . .  16
   Appendix A.  Link-layer Address Changes . . . . . . . . . . . . .  17
   Appendix B.  Interfaces with Multiple Link-Layer Addresses  . . .  17
   Appendix C.  Change Log . . . . . . . . . . . . . . . . . . . . .  17
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .  18

1.  Introduction

   "Neighbor Discovery for IP version 6 (IPv6)" [RFC4861] (IPv6 ND)
   provides a Router Solicitation (RS) function allowing nodes to
   solicit a Router Advertisement (RA) response from an on-link router,
   a Neighbor Solicitation (NS) function allowing nodes to solicit a
   Neighbor Advertisement (NA) response from an on-link neighbor, and a
   Redirect function allowing routers to inform nodes of a better next
   hop neighbor on the link toward the destination.  Further guidance
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