Internet Engineering Task Force                                 R. Droms
Internet-Draft                                                     Cisco
Updates: RFC 4291 (if approved)                            July 30, 2013
Intended status: Standards Track
Expires: January 31, 2014


                     IPv6 Multicast Address Scopes
                draft-droms-6man-multicast-scopes-02.txt

Abstract

   This document updates the definitions of IPv6 multicast scopes.

Status of This Memo

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1.  Definition of IPv6 Multicast Address Scopes




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   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 RPL realm (or "domain") [RFC6550].  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; for
   example, all of the hosts and routers in a multi-link subnet RPL
   realm.

   The following table updates the definitions in RFC 4291:

   0  reserved

   1  Interface-Local scope

   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 paragraph is added as the third paragraph following the
   list of scop values in RFC 4291:




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         Realm-Local scope is the largest scope that is automatically
         configured, i.e., automatically derived from physical
         connectivity or other, non-multicast-related configuration.



2.  Definition of Realm-Local scopes

   The definition of any Realm-Local scope for a particular network
   technology should be published in an RFC.  For example, such a scope
   definition would be appropriate for publication in an "IPv6-over-foo"
   RFC.

   Any RFCs that include the definition of a Realm-Local scope will be
   listed in the IANA "IPv6 Multicast Address Scopes" registry.

3.  IANA Considerations

   IANA is asked to establish a sub-registry titled "IPv6 Multicast
   Address Scopes" in the existing "Internet Protocol version 6 (IPv6)
   Multicast Address Allocations" registry.  The "IPv6 Multicast Address
   Scopes" is to be populated with the scope values given in section 1,
   with a note associated with scope 3 listing all RFCs that define
   Realm-Local scoping rules that use scope 3.

4.  Security Considerations

   This document has no security considerations beyond those in RFC 4291
   [RFC4291].

5.  References

5.1.  Normative References

   [RFC4291]  Hinden, R. and S. Deering, "IP Version 6 Addressing
              Architecture", RFC 4291, February 2006.

5.2.  Informative References

   [I-D.ietf-roll-trickle-mcast]
              Hui, J. and R. Kelsey, "Multicast Protocol for Low power
              and Lossy Networks (MPL)", draft-ietf-roll-trickle-
              mcast-04 (work in progress), February 2013.

   [RFC6550]  Winter, T., Thubert, P., Brandt, A., Hui, J., Kelsey, R.,
              Levis, P., Pister, K., Struik, R., Vasseur, JP., and R.
              Alexander, "RPL: IPv6 Routing Protocol for Low-Power and
              Lossy Networks", RFC 6550, March 2012.



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Author's Address

   Ralph Droms
   Cisco
   1414 Massachusetts Avenue
   Boxborough, MA  01719
   US

   Phone: +1 978 936 1674
   Email: rdroms@cisco.com









































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