The IPv6 Link-Local Address Type Field
draft-templin-6man-lla-type-01

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Document Type Active Internet-Draft (individual)
Author Fred Templin 
Last updated 2020-11-23 (latest revision 2020-11-17)
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Network Working Group                                    F. Templin, Ed.
Internet-Draft                                        The Boeing Company
Intended status: Standards Track                       November 23, 2020
Expires: May 27, 2021

                 The IPv6 Link-Local Address Type Field
                     draft-templin-6man-lla-type-01

Abstract

   IPv6 link-local addresses are formed from the prefix fe80::/10 which
   is followed by 54 "zero" bits, then followed by a 64-bit Interface
   Identifier.  There are multiple methods for generating link-local
   addresses, and multiple may be in use by nodes on the same link (and
   sometimes even the same interface) at the same time.  This document
   defines an IPv6 link-local address "Type" field that identifies the
   type of link-local address being used.

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 27, 2021.

Copyright Notice

   Copyright (c) 2020 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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   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.  The IPv6 Link-Local Address Type Field  . . . . . . . . . . .   3
   4.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .   4
   5.  Security Considerations . . . . . . . . . . . . . . . . . . .   5
   6.  Acknowledgements  . . . . . . . . . . . . . . . . . . . . . .   5
   7.  References  . . . . . . . . . . . . . . . . . . . . . . . . .   5
     7.1.  Normative References  . . . . . . . . . . . . . . . . . .   5
     7.2.  Informative References  . . . . . . . . . . . . . . . . .   6
   Author's Address  . . . . . . . . . . . . . . . . . . . . . . . .   6

1.  Introduction

   The IPv6 link-local address prefix is defined in [RFC4291] as the
   prefix fe80::/10 followed by 54 "zero" bits, then followed by a
   64-bit interface identifier.  There are multiple methods for
   generating link-local addresses, and multiple may be in use on the
   same link (and sometimes even the same interface) at the same time.

   For example, [I-D.ietf-6man-rfc4941bis], [RFC7217], [RFC4291],
   [RFC3972], [I-D.templin-6man-omni-interface] and possibly others
   define diverse methods for generating interface identifiers for
   constructing link-local addresses on a given interface.
   Administrative configuration (e.g., manually setting the interface
   ID) is also an option available to all interfaces.

   IPv6 multi-addressing allows each interface to assign multiple IPv6
   addresses, and even multiple IPv6 link-local addresses.  On some
   interfaces, it may even be the case that multiple link-local
   addresses of different types would be configured at the same time.
   But, since the diverse methods for generating interface identifiers
   are not coordinated with one another, some interfaces may need a way
   to differentiate the types of link-local addresses as well as to
   avoid collisions and duplication.

   This document defines a Type field in the link-local address prefix
   for differentiating link-local address construction types.  The Type
   field also has a companion Function field which can be used to
   perform Type-specific functions such as Prefix Delegation (PD).

   This document updates [RFC4291].

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2.  Terminology

   The terminology in the normative references applies.

3.  The IPv6 Link-Local Address Type Field
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