Structured Local Address Plan (SLAP) Quadrant Selection Option for DHCPv6
RFC 8948

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Internet Engineering Task Force (IETF)                     CJ. Bernardos
Request for Comments: 8948                                          UC3M
Category: Standards Track                                      A. Mourad
ISSN: 2070-1721                                             InterDigital
                                                           December 2020

   Structured Local Address Plan (SLAP) Quadrant Selection Option for
                                 DHCPv6

Abstract

   The IEEE originally structured the 48-bit Media Access Control (MAC)
   address space in such a way that half of it was reserved for local
   use.  In 2017, the IEEE published a new standard (IEEE Std 802c) with
   a new optional Structured Local Address Plan (SLAP).  It specifies
   different assignment approaches in four specified regions of the
   local MAC address space.

   The IEEE is developing protocols to assign addresses (IEEE P802.1CQ).
   There is also work in the IETF on specifying a new mechanism that
   extends DHCPv6 operation to handle the local MAC address assignments.

   This document proposes extensions to DHCPv6 protocols to enable a
   DHCPv6 client or a DHCPv6 relay to indicate a preferred SLAP quadrant
   to the server so that the server may allocate MAC addresses in the
   quadrant requested by the relay or client.  A new DHCPv6 option
   (QUAD) is defined for this purpose.

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/rfc8948.

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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Table of Contents

   1.  Introduction
     1.1.  Problem Statement
       1.1.1.  Wi-Fi (IEEE 802.11) Devices
       1.1.2.  Hypervisor: Functions That Are and Are Not Migratable
   2.  Terminology
   3.  DHCPv6 Extensions
     3.1.  Address Assignment from the Preferred SLAP Quadrant
           Indicated by the Client
     3.2.  Address Assignment from the Preferred SLAP Quadrant
           Indicated by the Relay
   4.  DHCPv6 Option Definition
     4.1.  QUAD Option
   5.  IANA Considerations
   6.  Security Considerations
   7.  References
     7.1.  Normative References
     7.2.  Informative References
   Appendix A.  Example Uses of Quadrant Selection Mechanisms
   Acknowledgments
   Authors' Addresses

1.  Introduction

   The IEEE structures the 48-bit MAC address space in such a way that
   half of it is reserved for local use (where the Universal/Local (U/L)
   bit is set to 1).  In 2017, the IEEE published a new standard
   [IEEEStd802c] that defines a new optional Structured Local Address
   Plan (SLAP) that specifies different assignment approaches in four
   specified regions of the local MAC address space.  These four
   regions, called SLAP quadrants, are briefly described below (see
   Figure 1 and Table 1 for details):

   *  In SLAP Quadrant 01, Extended Local Identifier (ELI) MAC addresses
      are assigned based on a 24-bit Company ID (CID), which is assigned
      by the IEEE Registration Authority (RA).  The remaining bits are
      specified as an extension by the CID assignee or by a protocol
      designated by the CID assignee.

   *  In SLAP Quadrant 11, Standard Assigned Identifier (SAI) MAC
      addresses are assigned based on a protocol specified in an IEEE
      802 standard.  For 48-bit MAC addresses, 44 bits are available.
      Multiple protocols for assigning SAIs may be specified in IEEE
      standards.  Coexistence of multiple protocols may be supported by
      limiting the subspace available for assignment by each protocol.

   *  In SLAP Quadrant 00, Administratively Assigned Identifier (AAI)
      MAC addresses are assigned locally by an administrator.  Multicast
      IPv6 packets use a destination address starting in 33-33, so AAI
      addresses in that range should not be assigned.  For 48-bit MAC
      addresses, 44 bits are available.