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Versions: 00 01 02 03 04 05 06 rfc7736                   Standards Track
CDNI                                                               K. Ma
Internet-Draft                                                  Ericsson
Intended status: Informational                           October 4, 2015
Expires: April 6, 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 .

Status of This Memo

   This Internet-Draft is submitted in full conformance with the
   provisions of BCP 78 and BCP 79.

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   This Internet-Draft will expire on April 6, 2016.

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   Copyright (c) 2015 IETF Trust and the persons identified as the
   document authors.  All rights reserved.

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Table of Contents

   1.  Introduction and Scope  . . . . . . . . . . . . . . . . . . .   2
   2.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .   2
     2.1.  CDNI Media Type . . . . . . . . . . . . . . . . . . . . .   2
     2.2.  CDNI Payload Type Parameter Registry  . . . . . . . . . .   4
   3.  References  . . . . . . . . . . . . . . . . . . . . . . . . .   5
     3.1.  Normative References  . . . . . . . . . . . . . . . . . .   5
     3.2.  Informative References  . . . . . . . . . . . . . . . . .   6
   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, as discussed in [RFC6770].  The
   CDNI protocol suite consists of multiple HTTP-based interfaces, many
   of which transfer various JSON encoded payloads [RFC7159].  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 parameters 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 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

2.1.  CDNI Media Type

   Type name: application

   Subtype name: cdni

   Required parameters:

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         The required parameter "ptype" describes the type of CDNI
         message contained in the message payload, as registered in the
         CDNI Payload Type Parameter Registry (Section 2.2) defined

   Optional parameters: none

   Encoding considerations:

      The CDNI protocol suite includes interfaces with 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 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 designated expert.

   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.

   Fragment identifier considerations: N/A

   Additional information: N/A

      Deprecated alias names for this type: N/A

      Magic number(s): N/A

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      File extension(s): N/A

      Macintosh file type code(s): 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: no

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

        ptype = 1*256(ptype-char)
        ptype-char = %x21 / %23-3A / %x3C / %x3E-7E
          ; Includes ALPHA, DIGIT, and other printables
          ; Excludes equal signs (=), double quotes ("), semicolons (;)

   Additions to the CDNI Payload Type namespace will conform to the
   "Specification Required" policy as defined in [RFC5226].  The
   designated expert will 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 designated expert will review the
   specification, even if it is a Standards Track RFC, to verify that it
   contains the following information:

   o  The review will verify that the specification contains a
      reasonably defined purpose for the new payload type, where the

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      purpose is related to an existing or proposed CDNI interface and
      does 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 (e.g., deprecation of the overlapped
      feature, or justification for co-existence).

   o  The review will verify that the specification contains information
      as to which CDNI interface the new payload type pertains/affects.
      The payload type may be applicable to multiple CDNI interfaces,
      but the justification for the new payload type will include a
      reasonable relationship to at least one standards track CDNI

   o  The review will verify that the specification contains 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 parsers.

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

                     | Payload Type | Specification |

3.  References

3.1.  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,

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3.2.  Informative References

   [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>.

   [RFC7159]  Bray, T., Ed., "The JavaScript Object Notation (JSON) Data
              Interchange Format", RFC 7159, DOI 10.17487/RFC7159, March
              2014, <http://www.rfc-editor.org/info/rfc7159>.

   [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>.

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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