Neighbor Discovery Optimization for Low Power and Lossy Networks (6LoWPAN)
draft-ietf-6lowpan-nd-18

The information below is for an old version of the document
Document Type Active Internet-Draft (6lowpan WG)
Last updated 2012-01-05 (latest revision 2011-10-24)
Replaces draft-shelby-6lowpan-nd, draft-chakrabarti-6lowpan-ipv6-nd, draft-chakrabarti-6lowpan-ipv6-nd-simple, draft-hui-6lowpan-nd
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Send notices to 6lowpan-chairs@tools.ietf.org, draft-ietf-6lowpan-nd@tools.ietf.org
6LoWPAN Working Group                                     Z. Shelby, Ed.
Internet-Draft                                                 Sensinode
Updates: 4944 (if approved)                               S. Chakrabarti
Intended status: Standards Track                                Ericsson
Expires: April 26, 2012                                      E. Nordmark
                                                           Cisco Systems
                                                        October 24, 2011

    Neighbor Discovery Optimization for Low Power and Lossy Networks
                               (6LoWPAN)
                        draft-ietf-6lowpan-nd-18

Abstract

   The IETF 6LoWPAN working group defines IPv6 over Low-power Wireless
   Personal Area Networks such as IEEE 802.15.4.  This and other similar
   link technologies have limited or no usage of multicast signaling due
   to energy conservation.  In addition, the wireless network may not
   strictly follow traditional concept of IP subnets and IP links.  IPv6
   Neighbor Discovery was not designed for non-transitive wireless
   links.  The traditional IPv6 link concept and heavy use of multicast
   make the protocol inefficient and sometimes impractical in a low
   power and lossy network.  This document describes simple
   optimizations to IPv6 Neighbor Discovery, addressing mechanisms and
   duplicate address detection for 6LoWPAN and similar networks.  The
   document, thus updates RFC 4944 to specify the use of the
   optimizations defined here.

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
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   This Internet-Draft will expire on April 26, 2012.

Copyright Notice

Shelby, et al.           Expires April 26, 2012                 [Page 1]
Internet-Draft         ND Optimization for 6LoWPAN          October 2011

   Copyright (c) 2011 IETF Trust and the persons identified as the
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Table of Contents

   1.  Introduction . . . . . . . . . . . . . . . . . . . . . . . . .  4
     1.1.  The Shortcomings of IPv6 Neighbor Discovery  . . . . . . .  5
     1.2.  Mesh-under and Route-over Concepts . . . . . . . . . . . .  6
     1.3.  Applicability  . . . . . . . . . . . . . . . . . . . . . .  7
     1.4.  Goals and Assumptions  . . . . . . . . . . . . . . . . . .  7
     1.5.  Optional Features  . . . . . . . . . . . . . . . . . . . .  9
   2.  Terminology  . . . . . . . . . . . . . . . . . . . . . . . . .  9
   3.  Protocol Overview  . . . . . . . . . . . . . . . . . . . . . . 11
     3.1.  Extensions to RFC4861  . . . . . . . . . . . . . . . . . . 11
     3.2.  Address Assignment . . . . . . . . . . . . . . . . . . . . 12
     3.3.  Host-to-Router Interaction . . . . . . . . . . . . . . . . 12
     3.4.  Router-to-Router Interaction . . . . . . . . . . . . . . . 13
     3.5.  Neighbor Cache Management  . . . . . . . . . . . . . . . . 14
   4.  New Neighbor Discovery Options and Messages  . . . . . . . . . 15
     4.1.  Address Registration Option  . . . . . . . . . . . . . . . 15
     4.2.  6LoWPAN Context Option . . . . . . . . . . . . . . . . . . 17
     4.3.  Authoritative Border Router Option . . . . . . . . . . . . 18
     4.4.  Duplicate Address messages . . . . . . . . . . . . . . . . 20
   5.  Host Behavior  . . . . . . . . . . . . . . . . . . . . . . . . 21
     5.1.  Forbidden Actions  . . . . . . . . . . . . . . . . . . . . 21
     5.2.  Interface Initialization . . . . . . . . . . . . . . . . . 21
     5.3.  Sending a Router Solicitation  . . . . . . . . . . . . . . 22
     5.4.  Processing a Router Advertisement  . . . . . . . . . . . . 22
       5.4.1.  Address configuration  . . . . . . . . . . . . . . . . 23
       5.4.2.  Storing Contexts . . . . . . . . . . . . . . . . . . . 23
       5.4.3.  Maintaining Prefix and Context Information . . . . . . 23
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