ALTO Extension: Path Vector
draft-ietf-alto-path-vector-09

Document Type Active Internet-Draft (alto WG)
Last updated 2019-11-03
Replaces draft-yang-alto-path-vector
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ALTO WG                                                           K. Gao
Internet-Draft                                        Sichuan University
Intended status: Standards Track                                  Y. Lee
Expires: May 6, 2020                                              Huawei
                                                          S. Randriamasy
                                                         Nokia Bell Labs
                                                                 Y. Yang
                                                         Yale University
                                                                J. Zhang
                                                       Tongji University
                                                        November 3, 2019

                      ALTO Extension: Path Vector
                     draft-ietf-alto-path-vector-09

Abstract

   This document defines an ALTO extension that allows an ALTO
   information resource to provide not only preferences but also
   correlations of the paths between different PIDs or endpoints.  The
   extended information, including aggregations of network components on
   the paths and their properties, can be used to improve the robustness
   and performance for applications in some new usage scenarios, such as
   high-speed data transfers and traffic optimization using in-network
   storage and computation.

   This document reuses the mechanisms of the ALTO base protocol and the
   Unified Property extension, such as Information Resource Directory
   (IRD) capabilities and entity domains, to negotiate and exchange path
   correlation information.  Meanwhile, it uses an extended compound
   message to fully represent the path correlation information, for
   better server scalability and message modularity.  Specifically, the
   extension 1) introduces abstract network element (ANE) as an
   abstraction for an aggregation of network components and encodes a
   network path as a "path vector", i.e., an array of ANEs traversed
   from the source to the destination, 2) encodes properties of abstract
   network elements in a unified property map, and 3) encapsulates the
   two types of information in a multipart message.

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].

Gao, et al.                Expires May 6, 2020                  [Page 1]
Internet-Draft         ALTO Extension: Path Vector         November 2019

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
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   This Internet-Draft will expire on May 6, 2020.

Copyright Notice

   Copyright (c) 2019 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
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   described in the Simplified BSD License.

Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   4
   2.  Changes since -08 . . . . . . . . . . . . . . . . . . . . . .   5
   3.  Terminology . . . . . . . . . . . . . . . . . . . . . . . . .   5
   4.  Use Cases . . . . . . . . . . . . . . . . . . . . . . . . . .   6
     4.1.  Shared Risk Resource Group  . . . . . . . . . . . . . . .   6
     4.2.  Capacity Region . . . . . . . . . . . . . . . . . . . . .   8
     4.3.  In-Network Caching  . . . . . . . . . . . . . . . . . . .  10
   5.  Overview  . . . . . . . . . . . . . . . . . . . . . . . . . .  11
     5.1.  Workflow  . . . . . . . . . . . . . . . . . . . . . . . .  11
     5.2.  Abstract Network Element  . . . . . . . . . . . . . . . .  12
     5.3.  Protocol Extensions . . . . . . . . . . . . . . . . . . .  13
       5.3.1.  Path Vector Cost Type . . . . . . . . . . . . . . . .  13
       5.3.2.  Property Negotiation  . . . . . . . . . . . . . . . .  14
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