Updates to the IPv6 Multicast Addressing Architecture
RFC 7371

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Internet Engineering Task Force (IETF)                      M. Boucadair
Request for Comments: 7371                                France Telecom
Updates: 3306, 3956, 4291                                      S. Venaas
Category: Standards Track                                          Cisco
ISSN: 2070-1721                                           September 2014

         Updates to the IPv6 Multicast Addressing Architecture

Abstract

   This document updates the IPv6 multicast addressing architecture by
   redefining the reserved bits as generic flag bits.  The document also
   provides some clarifications related to the use of these flag bits.

   This document updates RFCs 3956, 3306, and 4291.

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 5741.

   Information about the current status of this document, any errata,
   and how to provide feedback on it may be obtained at
   http://www.rfc-editor.org/info/rfc7371.

Boucadair & Venaas           Standards Track                    [Page 1]
RFC 7371                   Multicast Flag Bits            September 2014

Copyright Notice

   Copyright (c) 2014 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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   This document may contain material from IETF Documents or IETF
   Contributions published or made publicly available before November
   10, 2008.  The person(s) controlling the copyright in some of this
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   Without obtaining an adequate license from the person(s) controlling
   the copyright in such materials, this document may not be modified
   outside the IETF Standards Process, and derivative works of it may
   not be created outside the IETF Standards Process, except to format
   it for publication as an RFC or to translate it into languages other
   than English.

Table of Contents

   1. Introduction ....................................................3
      1.1. Requirements Language ......................................3
   2. Addressing Architecture Update ..................................3
   3. Flag Bits: New Processing Rules .................................4
   4. RFC Updates .....................................................4
      4.1. Updates to RFC 3306 ........................................4
           4.1.1. Update #1 ...........................................4
           4.1.2. Update #2 ...........................................6
      4.2. Updates to RFC 3956 ........................................6
           4.2.1. Update #1 ...........................................6
           4.2.2. Update #2 ...........................................7
           4.2.3. Update #3 ...........................................8
           4.2.4. Update #4 ...........................................9
   5. Security Considerations .........................................9
   6. Acknowledgements ................................................9
   7. References ......................................................9
      7.1. Normative References .......................................9
      7.2. Informative References ....................................10

Boucadair & Venaas           Standards Track                    [Page 2]
RFC 7371                   Multicast Flag Bits            September 2014

1.  Introduction

   This document updates the IPv6 addressing architecture [RFC4291] by
   redefining reserved bits as generic flag bits (Section 2).  The
   document also provides some clarifications related to the use of
   these flag bits (Section 3).

   This document updates [RFC3956], [RFC3306], and [RFC4291].  These
   updates are logical consequences of the new processing rules in
   Section 3.

   Textual representation of IPv6 addresses included in the RFC updates
   follows the recommendation in [RFC5952].

1.1.  Requirements Language

   The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT",
   "SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and "OPTIONAL" in this