Models for HTTP-Adaptive-Streaming-Aware Content Distribution Network Interconnection (CDNI)
RFC 6983

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Independent Submission                                R. van Brandenburg
Request for Comments: 6983                               O. van Deventer
Category: Informational                                              TNO
ISSN: 2070-1721                                           F. Le Faucheur
                                                                K. Leung
                                                           Cisco Systems
                                                               July 2013

                Models for HTTP-Adaptive-Streaming-Aware
          Content Distribution Network Interconnection (CDNI)

Abstract

   This document presents thoughts on the potential impact of supporting
   HTTP Adaptive Streaming (HAS) technologies in Content Distribution
   Network Interconnection (CDNI) scenarios.  The intent is to present
   the authors' analysis of the CDNI-HAS problem space and discuss
   different options put forward by the authors (and by others during
   informal discussions) on how to deal with HAS in the context of CDNI.
   This document has been used as input information during the CDNI
   working group process for making a decision regarding support for
   HAS.

Status of This Memo

   This document is not an Internet Standards Track specification; it is
   published for informational purposes.

   This is a contribution to the RFC Series, independently of any other
   RFC stream.  The RFC Editor has chosen to publish this document at
   its discretion and makes no statement about its value for
   implementation or deployment.  Documents approved for publication by
   the RFC Editor are not a candidate for any level of Internet
   Standard; see Section 2 of RFC 5741.

   Information about the current status of this document, any errata,
   and how to provide feedback on it may be obtained at
   http://www.rfc-editor.org/info/rfc6983.

van Brandenburg, et al.       Informational                     [Page 1]
RFC 6983            HTTP Adaptive Streaming and CDNI           July 2013

Copyright Notice

   Copyright (c) 2013 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.

Table of Contents

   1. Introduction ....................................................4
      1.1. Terminology ................................................5
   2. HTTP Adaptive Streaming Aspects Relevant to CDNI ................6
      2.1. Segmentation versus Fragmentation ..........................6
      2.2. Addressing Chunks ..........................................7
           2.2.1. Relative URLs .......................................8
           2.2.2. Absolute URLs with Redirection ......................9
           2.2.3. Absolute URLs without Redirection ..................10
      2.3. Live Content versus VoD Content ...........................11
      2.4. Stream Splicing ...........................................12
   3. Possible HAS Optimizations .....................................12
      3.1. File Management and Content Collections ...................13
           3.1.1. General Remarks ....................................13
           3.1.2. Candidate Approaches ...............................13
                  3.1.2.1. Option 1.1: Do Nothing ....................13
                  3.1.2.2. Option 1.2: Allow Single-File
                           Storage of Fragmented Content .............14
                  3.1.2.3. Option 1.3: Access Correlation Hint .......14
           3.1.3. Recommendations ....................................15
      3.2. Content Acquisition of Content Collections ................15
           3.2.1. General Remarks ....................................15
           3.2.2. Candidate Approaches ...............................16
                  3.2.2.1. Option 2.1: No HAS Awareness ..............16
                  3.2.2.2. Option 2.2: Allow Single-File
                           Acquisition of Fragmented Content .........17
           3.2.3. Recommendations ....................................17

van Brandenburg, et al.       Informational                     [Page 2]
RFC 6983            HTTP Adaptive Streaming and CDNI           July 2013

      3.3. Request Routing of HAS Content ............................17
           3.3.1. General Remarks ....................................17
           3.3.2. Candidate Approaches ...............................18
                  3.3.2.1. Option 3.1: No HAS Awareness ..............18
                  3.3.2.2. Option 3.2: Manifest File Rewriting
                           by uCDN ...................................20