Internet Engineering Task Force R. Droms Internet-Draft Cisco Updates: 4007, 4291 (if approved) June 3, 2014 Intended status: Standards Track Expires: December 5, 2014 IPv6 Multicast Address Scopes draft-ietf-6man-multicast-scopes-06.txt Abstract This document updates the definitions of IPv6 multicast scopes. This document updates RFC 4007 and RFC 4291 Status of This Memo This Internet-Draft is submitted in full conformance with the provisions of BCP 78 and BCP 79. Internet-Drafts are working documents of the Internet Engineering Task Force (IETF). Note that other groups may also distribute working documents as Internet-Drafts. The list of current Internet- Drafts is at http://datatracker.ietf.org/drafts/current/. Internet-Drafts are draft documents valid for a maximum of six months and may be updated, replaced, or obsoleted by other documents at any time. It is inappropriate to use Internet-Drafts as reference material or to cite them other than as "work in progress." This Internet-Draft will expire on December 5, 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 Provisions Relating to IETF Documents (http://trustee.ietf.org/license-info) in effect on the date of publication of this document. Please review these documents carefully, as they describe your rights and restrictions with respect to this document. Code Components extracted from this document must include Simplified BSD License text as described in Section 4.e of the Trust Legal Provisions and are provided without warranty as described in the Simplified BSD License. Droms Expires December 5, 2014 [Page 1] Internet-Draft IPv6 Multicast Address Scopes June 2014 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 material may not have granted the IETF Trust the right to allow modifications of such material outside the IETF Standards Process. 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. 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: Droms Expires December 5, 2014 [Page 2] Internet-Draft IPv6 Multicast Address Scopes June 2014 +------+--------------------------+--------------------+ | scop | NAME | REFERENCE | +------+--------------------------+--------------------+ | 0 | Reserved | [ RFC-to-be ] | | 1 | Interface | [ RFC-to-be ] | | 2 | Link-Local scope | [ RFC-to-be ] | | 3 | Realm-Local scope | [ RFC-to-be ] | | 4 | Admin-Local scope | [ RFC-to-be ] | | 5 | Site-Local scope | [ RFC-to-be ] | | 6 | Unassigned | | | 7 | Unassigned | | | 8 | Organization-Local scope | [ RFC-to-be ] | | 9 | Unassigned | | | A | Unassigned | | | B | Unassigned | | | C | Unassigned | | | D | Unassigned | | | E | Global scope | [ RFC-to-be ] | | F | Reserved | [ RFC-to-be ] | +------+--------------------------+--------------------+ The following change is applied to section 2.7 of RFC 4291: Droms Expires December 5, 2014 [Page 3] Internet-Draft IPv6 Multicast Address Scopes June 2014 OLD: 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 configuration. NEW: Interface-Local, Link-Local, and Realm-Local scope boundaries are automatically derived from physical connectivity or other, non-multicast related configuration. Global scope has no boundary. The boundaries of all other non-reserved scopes of Admin-Local or larger are administratively configured. For reserved scopes, the way of configuring their boundaries will be defined when the semantics of the scope is defined. According to RFC 4007 [RFC4007], the zone of a Realm-Local scope must fall within zones of larger scope. Because the zone of a Realm-Local scope is configured automatically, while the zones of larger scopes are configured manually, care must be taken in the definition of those larger scopes to ensure that inclusion contraint is met. 3. 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 added to the IANA 'IPv6 Multicast Address Scopes' registry under the Realm-Local scope entry. Section 5 gives the definition of scop 3 for IEEE 802.15.4 [IEEE802.15.4] networks. 4. Definition of automatic and administratively configured scopes (updates RFC 4007) Section 5 of RFC 4007 [RFC4007] and section 2.7 of RFC 4291 disagree about the way in which multicast scope 3 is configured. To resolve that disagreement, change the last bullet in the list in section 5 of RFC 4007 as follows: Droms Expires December 5, 2014 [Page 4] Internet-Draft IPv6 Multicast Address Scopes June 2014 OLD: o The boundaries of zones of a scope other than interface-local, link-local, and global must be defined and configured by network administrators. NEW: o The boundaries of zones of a scope are defined by the IPv6 addressing architecture [RFC4291] and updated by this document. 5. Definition of Realm-Local Scope for IEEE 802.15.4 When used in an IP-over-IEEE802.15.4 network, "scop 3" is defined to include all interfaces sharing a PAN ID. 6. 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 new registry is to be populated with the scope values given in Section 2. New definitions for scop values will be made with "IETF Review" policy. IANA will add a note to the top of this registry: 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 this registry." 7. Acknowledgments Robert Cragie, Kerry Lynn, Jinmei Tatuya, Dave Thaler and Stig Venaas all contributed text and/or review to ensure that the updates to RFC 4007 and RFC 4291 are correct Droms Expires December 5, 2014 [Page 5] Internet-Draft IPv6 Multicast Address Scopes June 2014 8. Security Considerations This document has no security considerations beyond those in RFC 4007 [RFC4007] and RFC 4291 [RFC4291]. 9. References 9.1. Normative References [RFC4007] Deering, S., Haberman, B., Jinmei, T., Nordmark, E., and B. Zill, "IPv6 Scoped Address Architecture", RFC 4007, March 2005. [RFC4291] Hinden, R. and S. Deering, "IP Version 6 Addressing Architecture", RFC 4291, February 2006. 9.2. 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-09 (work in progress), April 2014. [IEEE802.15.4] IEEE Std 802.15.4-2006, "IEEE Standard for Information technology - Telecommunications and information exchange between systems - Local and metropolitan area networks - Specific requirements; Part 15.4: Wireless Medium Access Control (MAC) and Physical Layer (PHY) Specifications for Low-Rate Wireless Personal Area Networks (WPANs)", October 2006. Author's Address Ralph Droms Cisco 1414 Massachusetts Avenue Boxborough, MA 01719 US Phone: +1 978 936 1674 Email: rdroms.ietf@gmail.com Droms Expires December 5, 2014 [Page 6]