Request Routing Redirection Interface for CDN Interconnection
draft-ietf-cdni-redirection-01

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Last updated 2013-10-21
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Network Working Group                                  Danhua. Wang, Ed.
Internet-Draft                                       Huawei Technologies
Intended status: Standards Track                   B. Niven-Jenkins, Ed.
Expires: April 24, 2014                         Velocix (Alcatel-Lucent)
                                                             Xiaoyan. He
                                                                  Huawei
                                                                Chen. Ge
                                                           China Telecom
                                                                 Wei. Ni
                                                            China Mobile
                                                        October 21, 2013

     Request Routing Redirection Interface for CDN Interconnection
                     draft-ietf-cdni-redirection-01

Abstract

   The Request Routing Interface comprises of (1) the asynchronous
   advertisement of footprint and capabilities by a downstream CDN that
   allows a upstream CDN to decide whether to redirect particular user
   requests to that downstream CDN; and (2) the synchronous operation of
   an upstream CDN requesting whether a downstream CDN is prepared to
   accept a user request and of a downstream CDN responding with how to
   actually redirect the user request.  This document describes an
   interface for the latter part, i.e. the CDNI request routing/
   Redirection Interface.

Status of This Memo

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   This Internet-Draft will expire on April 24, 2014.

Copyright Notice

Wang, et al.             Expires April 24, 2014                 [Page 1]
Internet-Draft         Request Routing Redirection          October 2013

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Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
   2.  Terminology . . . . . . . . . . . . . . . . . . . . . . . . .   3
   3.  Interface function and operation overview . . . . . . . . . .   4
   4.  HTTP based RESTful interface for the Redirection Interface  .   5
     4.1.  Information passed in RI requests & responses . . . . . .   7
     4.2.  JSON encoding of RI requests & responses  . . . . . . . .   9
     4.3.  MIME Media Types used by the RI interface . . . . . . . .  10
     4.4.  DNS redirection . . . . . . . . . . . . . . . . . . . . .  10
       4.4.1.  DNS Redirection requests  . . . . . . . . . . . . . .  10
       4.4.2.  DNS Redirection responses . . . . . . . . . . . . . .  12
     4.5.  HTTP Redirection  . . . . . . . . . . . . . . . . . . . .  13
       4.5.1.  HTTP Redirection requests . . . . . . . . . . . . . .  13
       4.5.2.  HTTP Redirection responses  . . . . . . . . . . . . .  15
     4.6.  Indicating the cacheability and scope of responses  . . .  16
     4.7.  Error responses . . . . . . . . . . . . . . . . . . . . .  18
     4.8.  Loop detection & prevention . . . . . . . . . . . . . . .  20
   5.  Security Considerations . . . . . . . . . . . . . . . . . . .  20
   6.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .  21
   7.  Acknowledgements  . . . . . . . . . . . . . . . . . . . . . .  21
   8.  Outstanding considerations  . . . . . . . . . . . . . . . . .  22
   9.  Contributing Authors  . . . . . . . . . . . . . . . . . . . .  22
   10. References  . . . . . . . . . . . . . . . . . . . . . . . . .  22
     10.1.  Normative References . . . . . . . . . . . . . . . . . .  22
     10.2.  Informative References . . . . . . . . . . . . . . . . .  23
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .  23

1.  Introduction

   A Content Delivery Network (CDN) is a system built on an existing IP
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