Neighbor Management Policy for 6LoWPAN
draft-ietf-lwig-nbr-mgmt-policy-01

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LWIG                                                      R. Jadhav, Ed.
Internet-Draft                                                  R. Sahoo
Intended status: Informational                                    Huawei
Expires: August 26, 2018                                    S. Duquennoy
                                                                   Inria
                                                             J. Eriksson
                                                          Yanzi Networks
                                                       February 22, 2018

                 Neighbor Management Policy for 6LoWPAN
                   draft-ietf-lwig-nbr-mgmt-policy-01

Abstract

   This document describes the problems associated with neighbor cache
   management in constrained multihop networks and a sample neighbor
   management policy to deal with it.

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   This Internet-Draft will expire on August 26, 2018.

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   Copyright (c) 2018 IETF Trust and the persons identified as the
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Jadhav, et al.           Expires August 26, 2018                [Page 1]
Internet-Draft   Neighbor Management Policy for 6LoWPAN    February 2018

   the Trust Legal Provisions and are provided without warranty as
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Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
     1.1.  Requirements Language and Terminology . . . . . . . . . .   4
   2.  Neighbor Management . . . . . . . . . . . . . . . . . . . . .   5
     2.1.  Significance of Neighbor management policy  . . . . . . .   5
     2.2.  Trivial neighbor management policies  . . . . . . . . . .   6
     2.3.  Lifecycle of a NCE  . . . . . . . . . . . . . . . . . . .   7
       2.3.1.  NCE Insertion . . . . . . . . . . . . . . . . . . . .   7
       2.3.2.  NCE Deletion  . . . . . . . . . . . . . . . . . . . .  10
       2.3.3.  NCE Eviction  . . . . . . . . . . . . . . . . . . . .  11
         2.3.3.1.  Eviction for directly connected routing entries .  11
       2.3.4.  NCE Reinforcement . . . . . . . . . . . . . . . . . .  12
     2.4.  Requirements of a good neighbor management policy . . . .  12
     2.5.  Approaches to neighbor management policy  . . . . . . . .  13
       2.5.1.  Reactive Approach . . . . . . . . . . . . . . . . . .  13
       2.5.2.  Proactive Approach  . . . . . . . . . . . . . . . . .  13
   3.  Reservation based Neighbor Management Policy  . . . . . . . .  14
     3.1.  Limitations of such a policy  . . . . . . . . . . . . . .  15
   4.  Acknowledgements  . . . . . . . . . . . . . . . . . . . . . .  16
   5.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .  16
   6.  Security Considerations . . . . . . . . . . . . . . . . . . .  16
   7.  References  . . . . . . . . . . . . . . . . . . . . . . . . .  16
     7.1.  Normative References  . . . . . . . . . . . . . . . . . .  16
     7.2.  Informative References  . . . . . . . . . . . . . . . . .  17
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .  17

1.  Introduction

   In a wireless multihop network, the node densities (maximum number of
   devices connected on a single hop) may vary significantly depending
   upon deployments/scenarios.  While there is some policy control
   possible with regards to the network size in terms of maximum number
   of devices connected, it is especially difficult to set a figure on
   what will be the maximum node density given a deployment.  For e.g.
   A network can put an upper limit on max 1000 devices but it is
   impossible to state what the node density will be in this 1000 node
   network.

   A neighbor cache is used for populating neighboring one-hop connected
   nodes information such as MAC address, link local IP address and
   other reachability state information.  Node density has direct