The IPv6 Link-Local Address Type Field
draft-templin-6man-lla-type-02

Document Type Active Internet-Draft (individual)
Author Fred Templin 
Last updated 2020-11-23
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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-02

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.  LLA-Based Prefix Delegation (PD)  . . . . . . . . . . . . . .   4
   5.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .   5
   6.  Security Considerations . . . . . . . . . . . . . . . . . . .   5
   7.  Acknowledgements  . . . . . . . . . . . . . . . . . . . . . .   5
   8.  References  . . . . . . . . . . . . . . . . . . . . . . . . .   6
     8.1.  Normative References  . . . . . . . . . . . . . . . . . .   6
     8.2.  Informative References  . . . . . . . . . . . . . . . . .   6
   Author's Address  . . . . . . . . . . . . . . . . . . . . . . . .   7

1.  Introduction

   The IPv6 link-local address (LLA) 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 LLAs, 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 LLAs 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 LLAs.  On some interfaces, it may
   even be the case that multiple LLAs 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
   LLAs as well as to avoid collisions and duplication.

   This document defines a Type field in the LLA prefix for
   differentiating LLA 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

   [RFC4291] defines the IPv6 LLA format as the prefix fe80::/10,
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