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Versions: 00 01                                                         
CDNI                                                               K. Ma
Internet-Draft                                                  Ericsson
Intended status: Informational                             July 29, 2015
Expires: January 30, 2016

                      CDNI Media Type Registration


   This document defines the standard media type used by the Content
   Delivery Network Interconnection (CDNI) protocol suite, including the
   registration procedure and recommended usage of the required payload-
   type parameter .

Requirements Language

   The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT",
   document are to be interpreted as described in RFC 2119 [RFC2119].

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
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   Drafts is at http://datatracker.ietf.org/drafts/current/.

   Internet-Drafts are draft documents valid for a maximum of six months
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   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 January 30, 2016.

Copyright Notice

   Copyright (c) 2015 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

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   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.

Table of Contents

   1.  Introduction and Scope  . . . . . . . . . . . . . . . . . . .   2
   2.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .   2
     2.1.  CDNI Media Type . . . . . . . . . . . . . . . . . . . . .   3
     2.2.  CDNI Payload Type Parameter Registry  . . . . . . . . . .   4
   3.  Normative References  . . . . . . . . . . . . . . . . . . . .   5
   Appendix A.  Acknowledgment . . . . . . . . . . . . . . . . . . .   6
   Author's Address  . . . . . . . . . . . . . . . . . . . . . . . .   6

1.  Introduction and Scope

   The CDNI working group is developing a set of protocols to enable the
   interconnection of multiple CDNs to a CDN federation, as discussed in
   [RFC6770].  The CDNI protocol suite consists of multiple HTTP-based
   interfaces, many of which transfer various json encoded payloads.
   The main interfaces (i.e., CDNI Control interface, CDNI Footprint &
   Capabilities Advertisement interface, CDNI Request Routing
   Redirection interface, CDNI Metadata interface, and CDNI Logging
   interface) are described in [RFC7336].  It is desirable to be able to
   indicate the type of object carried in the HTTP entity-body without
   having to register separate media types for each CDNI object.  To
   accomplish this aims, this document defines a single new media type
   for CDNI that includes a required payload-type parameter.  A separate
   registry of CDNI payload-type parameter values is also defined.  CDNI
   protocol specifications may register interface-specific payload-
   types, specifying the payload encoding and parsing semantics for that
   message (e.g., json serialization for a CDNI metadata object).  The
   same payload-type parameter names may also be used as references for
   other purposes (e.g., referencing CDNI metadata objects from CDNI
   capability advertisement objects).

2.  IANA Considerations

   This section contains the CDNI media type registration request for
   IANA, as well as the payload-type parameter registry definition for

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2.1.  CDNI Media Type

   Type name: application

   Subtype name: cdni

   Required parameters:


         The required parameter "ptype" describes the type of CDNI
         message contained in the message payload.  The ptype value must
         be a ptype value registered in CDNI Payload Type Parameter
         Registry (Section 2.2) defined below.

   Optional parameters: none

   Encoding considerations:

      The CDNI protocol suite includes interfaces with json encoded
      messages which may be 8bit or binary, as well as generic logging
      information which may be 7bit or binary.

   Security considerations:

      CDNI interfaces that return json encoded data may be
      (mis)interpreted if parsed by non-CDNI or non-compliant CDNI
      implementations.  In addition, CDNI logging information is likely
      to transfer large amounts of data which may overload unexpecting
      clients.  The individual CDNI interface specifications provide
      more detailed analysis of security and privacy concerns, and
      define the requirements for authentication, authorization,
      confidentiality, integrity, and privacy for each interface.

   Interoperability considerations:

      The required ptype field is intended to fully describe the
      structure and parsing of CDNI messages, as enforced by the ptype
      registry expert reviewer.

   Published specification: RFCthis

   Applications that use this media type:

      CDNI is intended for use between interconnected CDNs for sharing
      configuration and logging data, as well as for issuing content
      management and redirection requests.

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   Additional information: N/A

   Person & email address to contact for further information:

      Kevin Ma <kevin.j.ma@ericsson.com>

   Intended usage: LIMITED USE

   Restrictions on usage:

      This media type is intended only for use in CDNI protocol message

   Author: IETF CDNI working group

   Change controller: IETF CDNI working group

   Provisional registration: yes

2.2.  CDNI Payload Type Parameter Registry

   The IANA is requested to create a new "CDNI Payload Type" registry.
   The "CDNI Payload Type" namespace defines the valid values for the
   required "ptype" parameter of the "application/cdni" media type.  The
   CDNI Payload Type is an ASCII string value, consisting of only
   visible (printing) characters, but excluding equal signs (=), double
   quotes ("), and semicolons (;), and not exceeding 256 characters in

   Additions to the CDNI Payload Type namespace conform to the "Expert
   Review" policy as defined in [RFC5226].  The expert review should
   verify that new type definitions do not duplicate existing type
   definitions (in name or functionality), prevent gratuitous additions
   to the namespace, and prevent any additions to the namespace which
   would impair the interoperability of CDNI implementations.  The
   expert review must include review of a publicly available written
   specification (preferably an RFC, though an RFC is not required).
   The expert review should verify the following information is
   documented in the written specification:

   o  The specification must contain a reasonably defined purpose for
      the new payload type.  The purpose should be related to an
      existing or proposed CDNI interface and should not duplicate the
      functionality of any existing CDNI protocol feature without
      specifying a rational reason (e.g., updating an obsolete feature),
      a method for detecting and handling conflicts (e.g., a versioning
      system with prioritization matrix), and a suggested migration path

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      (e.g., deprecation of the overlapped feature, or justification for

   o  The specification must contain information as to which CDNI
      interface the new payload type pertains/affects.  The payload type
      may be applicable to multiple CDNI interfaces.  The justification
      for the new payload type must include a reasonable relationship to
      a standards track CDNI interface.

   o  The specification must contain sufficient detail about the data
      encoding (e.g., json serialization for new CDNI metadata or
      capability advertisement objects, or ABNF and description for new
      CDNI logging file formats) to allow senders and receivers of the
      new payload type to implement compliant and interoperable payload

   The registry contains the Payload Type value, and the specification
   describing the Payload Type.  The registry should initially be

                     | Payload Type | Specification |

3.  Normative References

   [RFC2119]  Bradner, S., "Key words for use in RFCs to Indicate
              Requirement Levels", BCP 14, RFC 2119,
              DOI 10.17487/RFC2119, March 1997,

   [RFC5226]  Narten, T. and H. Alvestrand, "Guidelines for Writing an
              IANA Considerations Section in RFCs", BCP 26, RFC 5226,
              DOI 10.17487/RFC5226, May 2008,

   [RFC6770]  Bertrand, G., Ed., Stephan, E., Burbridge, T., Eardley,
              P., Ma, K., and G. Watson, "Use Cases for Content Delivery
              Network Interconnection", RFC 6770, DOI 10.17487/RFC6770,
              November 2012, <http://www.rfc-editor.org/info/rfc6770>.

   [RFC7336]  Peterson, L., Davie, B., and R. van Brandenburg, Ed.,
              "Framework for Content Distribution Network
              Interconnection (CDNI)", RFC 7336, DOI 10.17487/RFC7336,
              August 2014, <http://www.rfc-editor.org/info/rfc7336>.

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Appendix A.  Acknowledgment

   This document is the culmination of the efforts of many in the CDNI
   working group, including (in alphabetical order): Francois Le
   Faucheur, Daryl Malas, Rob Murray, Ben Niven-Jenkins, Iuniana
   Oprescu, Jon Peterson, and Jan Seedorf.

Author's Address

   Kevin J. Ma
   43 Nagog Park
   Acton, MA  01720

   Phone: +1 978-844-5100
   Email: kevin.j.ma@ericsson.com

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