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Application-Layer Traffic Optimization (ALTO) Protocol
RFC 7285

Internet Engineering Task Force (IETF)                     R. Alimi, Ed.
Request for Comments: 7285                                        Google
Category: Standards Track                                  R. Penno, Ed.
ISSN: 2070-1721                                      Cisco Systems, Inc.
                                                            Y. Yang, Ed.
                                                         Yale University
                                                               S. Kiesel
                                                 University of Stuttgart
                                                              S. Previdi
                                                     Cisco Systems, Inc.
                                                                W. Roome
                                                          Alcatel-Lucent
                                                             S. Shalunov
                                                             Open Garden
                                                               R. Woundy
                                                                 Comcast
                                                          September 2014

         Application-Layer Traffic Optimization (ALTO) Protocol

Abstract

   Applications using the Internet already have access to some topology
   information of Internet Service Provider (ISP) networks.  For
   example, views to Internet routing tables at Looking Glass servers
   are available and can be practically downloaded to many network
   application clients.  What is missing is knowledge of the underlying
   network topologies from the point of view of ISPs.  In other words,
   what an ISP prefers in terms of traffic optimization -- and a way to
   distribute it.

   The Application-Layer Traffic Optimization (ALTO) services defined in
   this document provide network information (e.g., basic network
   location structure and preferences of network paths) with the goal of
   modifying network resource consumption patterns while maintaining or
   improving application performance.  The basic information of ALTO is
   based on abstract maps of a network.  These maps provide a simplified
   view, yet enough information about a network for applications to
   effectively utilize them.  Additional services are built on top of
   the maps.

   This document describes a protocol implementing the ALTO services.
   Although the ALTO services would primarily be provided by ISPs, other
   entities, such as content service providers, could also provide ALTO
   services.  Applications that could use the ALTO services are those
   that have a choice to which end points to connect.  Examples of such
   applications are peer-to-peer (P2P) and content delivery networks.

Alimi, et al.                Standards Track                    [Page 1]
RFC 7285                      ALTO Protocol               September 2014

Status of This Memo

   This is an Internet Standards Track document.

   This document is a product of the Internet Engineering Task Force
   (IETF).  It represents the consensus of the IETF community.  It has
   received public review and has been approved for publication by the
   Internet Engineering Steering Group (IESG).  Further information on
   Internet Standards is available in 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/rfc7285.

Copyright Notice

   Copyright (c) 2014 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 ....................................................6
      1.1. Problem Statement ..........................................6
           1.1.1. Requirements Language ...............................7
      1.2. Design Overview ............................................7
   2. Terminology .....................................................7
      2.1. Endpoint ...................................................8
      2.2. Endpoint Address ...........................................8
      2.3. Network Location ...........................................8

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