Multi-Cost ALTO
draft-ietf-alto-multi-cost-06

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Network Working Group                                     S. Randriamasy
Internet-Draft                                                  W. Roome
Intended status: Standards Track                         Nokia Bell Labs
Expires: September 11, 2017                                    N. Schwan
                                                      Thales Deutschland
                                                          March 10, 2017

                            Multi-Cost ALTO
                     draft-ietf-alto-multi-cost-06

Abstract

   The ALTO (Application Layer-Traffic Optimization) Protocol
   ([RFC7285]) defines several services that return various metrics
   describing the costs between network endpoints.  An ALTO Server may
   offer a variety of cost metrics, based on latency,bandwidth, hop
   count, jitter, or whatever else the ALTO Server deems useful.  For
   example, when downloading a file that is mirrored on several sites, a
   user application may consider more than one metric, perhaps trading
   bandwidth for latency to determine the most efficient mirror site.

   While the base ALTO Protocol allows an ALTO Client to use more than
   one cost metric, to do so, the Client must request each metric
   separately.  This document defines a new service that allows a Client
   to retrieve several cost metrics with one request, which is
   considerably more efficient.  In addition, this document extends the
   ALTO constraint tests to allow a user to specify an arbitrary logical
   combination of tests on several cost metrics.

Requirements Language

   The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT",
   "SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and "OPTIONAL" in this
   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
   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

Randriamasy, et al.    Expires September 11, 2017               [Page 1]
Internet-Draft               Multi-Cost ALTO                  March 2017

   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 September 11, 2017.

Copyright Notice

   Copyright (c) 2017 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.

Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   3
   2.  Terminology . . . . . . . . . . . . . . . . . . . . . . . . .   5
   3.  Overview Of Approach  . . . . . . . . . . . . . . . . . . . .   5
     3.1.  Multi-Cost Data Format  . . . . . . . . . . . . . . . . .   5
     3.2.  Compatibility With Legacy ALTO Clients  . . . . . . . . .   6
     3.3.  Filtered Multi Cost Map Resources . . . . . . . . . . . .   6
     3.4.  Endpoint Cost Service Resources . . . . . . . . . . . . .   7
     3.5.  Full Cost Map Resources . . . . . . . . . . . . . . . . .   7
     3.6.  Extended Constraint Tests . . . . . . . . . . . . . . . .   8
       3.6.1.  Extended constraint predicates  . . . . . . . . . . .   8
       3.6.2.  Extended logical combination of predicates  . . . . .   8
       3.6.3.  Testable Cost Types in constraints  . . . . . . . . .   9
       3.6.4.  Testable Cost Type Names in IRD capabilities  . . . .  10
       3.6.5.  Legacy ALTO Client issues . . . . . . . . . . . . . .  10
   4.  Protocol Extensions for Multi-Cost ALTO Transactions  . . . .  11
     4.1.  Filtered Cost Map Extensions  . . . . . . . . . . . . . .  11
       4.1.1.  Capabilities  . . . . . . . . . . . . . . . . . . . .  12
       4.1.2.  Accept Input Parameters . . . . . . . . . . . . . . .  13
       4.1.3.  Response  . . . . . . . . . . . . . . . . . . . . . .  16
     4.2.  Endpoint Cost Service Extensions  . . . . . . . . . . . .  16
       4.2.1.  Capabilities  . . . . . . . . . . . . . . . . . . . .  16
       4.2.2.  Accept Input Parameters . . . . . . . . . . . . . . .  16