Support for Adjustable Maximum Router Lifetimes per Link
RFC 8319

Document Type RFC - Proposed Standard (February 2018; No errata)
Updates RFC 4861
Last updated 2018-02-22
Replaces draft-krishnan-6man-maxra
Stream IETF
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Reviews GENART, SECDIR will not review this version
Stream WG state Submitted to IESG for Publication
Document shepherd Bob Hinden
Shepherd write-up Show (last changed 2017-07-24)
IESG IESG state RFC 8319 (Proposed Standard)
Consensus Boilerplate Yes
Telechat date
Responsible AD Terry Manderson
Send notices to bob.hinden@gmail.com, otroan@employees.org
IANA IANA review state IANA OK - No Actions Needed
IANA action state No IC
Internet Engineering Task Force (IETF)                       S. Krishnan
Request for Comments: 8319                                        Kaloom
Updates: 4861                                                J. Korhonen
Category: Standards Track                       Nordic Semiconductor ASA
ISSN: 2070-1721                                           S. Chakrabarti
                                                                 Verizon
                                                             E. Nordmark
                                                                  Zededa
                                                          A. Yourtchenko
                                                                   Cisco
                                                           February 2018

        Support for Adjustable Maximum Router Lifetimes per Link

Abstract

   The IPv6 Neighbor Discovery protocol specifies the maximum time
   allowed between sending unsolicited multicast Router Advertisements
   (RAs) from a router interface as well as the maximum router lifetime.
   It also allows the limits to be overridden by documents that are
   specific to the link layer.  This document allows for overriding
   these values on a per-link basis.

   This document specifies updates to the IPv6 Neighbor Discovery
   Protocol (RFC 4861) to increase the maximum time allowed between
   sending unsolicited multicast RAs from a router interface as well as
   to increase the maximum router lifetime.

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
   https://www.rfc-editor.org/info/rfc8319.

Krishnan, et al.             Standards Track                    [Page 1]
RFC 8319               Adjustable Router Lifetimes         February 2018

Copyright Notice

   Copyright (c) 2018 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
   (https://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.

Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   3
   2.  Terminology . . . . . . . . . . . . . . . . . . . . . . . . .   3
   3.  Relationship between AdvDefaultLifetime and MaxRtrAdvInterval   3
   4.  Updates to RFC 4861 . . . . . . . . . . . . . . . . . . . . .   4
   5.  Host Behavior . . . . . . . . . . . . . . . . . . . . . . . .   5
   6.  Security Considerations . . . . . . . . . . . . . . . . . . .   5
   7.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .   5
   8.  References  . . . . . . . . . . . . . . . . . . . . . . . . .   5
     8.1.  Normative References  . . . . . . . . . . . . . . . . . .   5
     8.2.  Informative References  . . . . . . . . . . . . . . . . .   6
   Acknowledgements  . . . . . . . . . . . . . . . . . . . . . . . .   6
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .   7

Krishnan, et al.             Standards Track                    [Page 2]
RFC 8319               Adjustable Router Lifetimes         February 2018

1.  Introduction

   IPv6 Neighbor Discovery relies on IP multicast based on the
   expectation that multicast makes efficient use of available bandwidth
   and avoids generating interrupts in the network nodes.  On some data
   link layers, multicast may not be natively supported.  On such links,
   any possible reduction of multicast traffic will be highly
   beneficial.  Unfortunately, due to the fixed protocol constants
   specified in [RFC4861], it is difficult to relax the multicast timers
   for Neighbor Discovery.  There are already clarifications specific to
   the link technology about how to tune the Neighbor Discovery Protocol
   (NDP) constants for certain systems in order to reduce excess NDP
   traffic.  For example, [RFC6459] and [RFC7066] contain such
   clarifications for 3GPP cellular links.

   This document specifies updates to the IPv6 Neighbor Discovery
   Protocol [RFC4861] to increase the maximum time allowed between
   sending unsolicited multicast RAs from a router interface as well as
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