IPv6 Multicast Address Scopes

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Document Type Active Internet-Draft (6man WG)
Author Ralph Droms 
Last updated 2014-05-16 (latest revision 2014-03-27)
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Internet Engineering Task Force                                 R. Droms
Internet-Draft                                                     Cisco
Updates: 4007, 4291 (if approved)                         March 27, 2014
Intended status: Standards Track
Expires: September 28, 2014

                     IPv6 Multicast Address Scopes


   This document updates the definitions of IPv6 multicast scopes.  This
   document updates RFC 4007 and RFC 4291

Status of This Memo

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   This document may contain material from IETF Documents or IETF
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   10, 2008.  The person(s) controlling the copyright in some of this
   material may not have granted the IETF Trust the right to allow
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   it for publication as an RFC or to translate it into languages other
   than English.

1.  Introduction

   RFC 4291 [RFC4291] defines "scop is a 4-bit multicast scope value
   used to limit the scope of the multicast group." scop 3 is defined as
   "reserved" in RFC 4291.  The multicast protocol specification in
   draft-ietf-roll-trickle-mcast [I-D.ietf-roll-trickle-mcast] desires
   to use multicast scop 3 for transport of multicast traffic scoped to
   a network of nodes connected in a mesh.  The use of this scop value
   is to accommodate a multicast scope that is greater than Link-Local
   but is also automatically determined by the network architecture.

2.  Definition of IPv6 Multicast Address Scopes (Updates RFC 4291)

   The following table updates the definitions in RFC 4291:

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      | scop | NAME                     |
      |  0   | reserved                 |
      |  1   | Interface                |
      |  2   | Link-Local scope         |
      |  3   | Realm-Local scope        |
      |  4   | Admin-Local scope        |
      |  5   | Site-Local scope         |
      |  6   | (unassigned)             |
      |  7   | (unassigned)             |
      |  8   | Organization-Local scope |
      |  9   | (unassigned)             |
      |  A   | (unassigned)             |
      |  B   | (unassigned)             |
      |  C   | (unassigned)             |
      |  D   | (unassigned)             |
      |  E   | Global scope             |
      |  F   | reserved                 |

   The following change is applied to section 2.7 of RFC 4291:

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         Admin-Local scope is the smallest scope that must be
         administratively configured, i.e., not automatically derived
         from physical connectivity or other, non-multicast-related
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