IPv6 Neighbor Discovery Optional RS/RA Refresh
draft-ietf-6man-rs-refresh-02

Document Type Active Internet-Draft (6man WG)
Last updated 2016-10-31
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6man WG                                                      E. Nordmark
Internet-Draft                                           Arista Networks
Updates: 4861,6059 (if approved)                          A. Yourtchenko
Intended status: Standards Track                                   Cisco
Expires: May 4, 2017                                         S. Krishnan
                                                                Ericsson
                                                        October 31, 2016

             IPv6 Neighbor Discovery Optional RS/RA Refresh
                     draft-ietf-6man-rs-refresh-02

Abstract

   IPv6 Neighbor Discovery relies on periodic multicast Router
   Advertisement messages to update timer values and to distribute new
   information (such as new prefixes) to hosts.  On some links the use
   of periodic multicast messages to all host becomes expensive, and in
   some cases it results in hosts waking up frequently.  Many
   implementations of RFC 4861 also use multicast for solicited Router
   Advertisement messages, even though that behavior is optional.

   This specification provides an optional mechanism for hosts and
   routers where instead of periodic multicast Router Advertisements the
   hosts are instructed (by the routers) to use Router Solicitations to
   request refreshed Router Advertisements.  This mechanism is enabled
   by configuring the router to include a new option in the Router
   Advertisement in order to allow the network administrator to choose
   host behavior based on whether periodic multicast are more efficient
   on their link or not.  The routers can also tell whether the hosts
   are capable of the new behavior through a new flag in the Router
   Solicitations.

Status of This Memo

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

   Internet-Drafts are working documents of the Internet Engineering
   Task Force (IETF).  Note that other groups may also distribute
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   Drafts is at http://datatracker.ietf.org/drafts/current/.

   Internet-Drafts are draft documents valid for a maximum of six months
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   time.  It is inappropriate to use Internet-Drafts as reference
   material or to cite them other than as "work in progress."

Nordmark, et al.           Expires May 4, 2017                  [Page 1]
Internet-Draft           Optional RS/RA Refresh             October 2016

   This Internet-Draft will expire on May 4, 2017.

Copyright Notice

   Copyright (c) 2016 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
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   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  . . . . . . . . . . . . . . . . . . . . . . . .   3
   2.  Goals and Requirements  . . . . . . . . . . . . . . . . . . .   4
   3.  Definition Of Terms . . . . . . . . . . . . . . . . . . . . .   4
   4.  Protocol Overview . . . . . . . . . . . . . . . . . . . . . .   4
   5.  New Neighbor Discovery Flags and Options  . . . . . . . . . .   5
     5.1.  Introducing a Router Solicitation Flag  . . . . . . . . .   5
     5.2.  Refresh Time option . . . . . . . . . . . . . . . . . . .   6
   6.  Conceptual Data Structures  . . . . . . . . . . . . . . . . .   6
   7.  Host Behavior . . . . . . . . . . . . . . . . . . . . . . . .   7
     7.1.  Sleep and Wakeup  . . . . . . . . . . . . . . . . . . . .   8
     7.2.  Movement  . . . . . . . . . . . . . . . . . . . . . . . .   8
   8.  Router Behavior . . . . . . . . . . . . . . . . . . . . . . .   8
     8.1.  Router and/or Interface Initialization  . . . . . . . . .   9
     8.2.  Periodic Multicast RA for unmodified hosts  . . . . . . .   9
     8.3.  Unsolicited RAs to share new information  . . . . . . . .   9
   9.  Router Advertisement Consistency  . . . . . . . . . . . . . .  10
   10. Security Considerations . . . . . . . . . . . . . . . . . . .  10
   11. IANA Considerations . . . . . . . . . . . . . . . . . . . . .  10
   12. Acknowledgements  . . . . . . . . . . . . . . . . . . . . . .  10
   13. Change Log  . . . . . . . . . . . . . . . . . . . . . . . . .  10
   14. References  . . . . . . . . . . . . . . . . . . . . . . . . .  11
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