ALTO Extension: Flow-based Cost Query
draft-gao-alto-fcs-03

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ALTO WG                                                           K. Gao
Internet-Draft                                       Tsinghua University
Intended status: Standards Track                                J. Zhang
Expires: January 5, 2018                                         J. Wang
                                                       Tongji University
                                                                Q. Xiang
                                                  Tongji/Yale University
                                                                 Y. Yang
                                                         Yale University
                                                            July 4, 2017

                 ALTO Extension: Flow-based Cost Query
                       draft-gao-alto-fcs-03.txt

Abstract

   The Endpoint Cost Service maps a source-destination pair into a cost
   value, which provides an abstract network view based on a subset of
   the 2-dimension address space.  Given that the emergence of new
   networking datapath capabilities has substantially increased the
   routing flexibility, such a query space is not sufficient to uniquely
   identify a flow.  To address the limitations of the network
   information query space provided by the legacy ALTO protocol, this
   document takes two approaches: extending the existing ALTO cost query
   services with fine-grained semantics, and enabling a new flow-based
   query service named Flow Cost Service.  These extensions move ALTO to
   a more flexible and expressive network information query space.

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
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   and may be updated, replaced, or obsoleted by other documents at any

Gao, et al.              Expires January 5, 2018                [Page 1]
Internet-Draft              Flow Cost Service                  July 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 January 5, 2018.

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
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   described in the Simplified BSD License.

Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   3
   2.  Terminology . . . . . . . . . . . . . . . . . . . . . . . . .   4
   3.  Overview of Approaches  . . . . . . . . . . . . . . . . . . .   5
     3.1.  Backward Compatible Flow-based Filter . . . . . . . . . .   5
     3.2.  Extended Endpoint Address . . . . . . . . . . . . . . . .   5
     3.3.  Flow Cost Service for Advanced Query  . . . . . . . . . .   5
   4.  Changes Since Version -01 . . . . . . . . . . . . . . . . . .   6
   5.  ALTO Flow Cost Specification: Basic Flow-based Query  . . . .   6
     5.1.  Flow-based Filtered Cost Map  . . . . . . . . . . . . . .   6
       5.1.1.  Capabilities  . . . . . . . . . . . . . . . . . . . .   6
       5.1.2.  Accept Input Parameters . . . . . . . . . . . . . . .   7
       5.1.3.  Response  . . . . . . . . . . . . . . . . . . . . . .   8
     5.2.  Extended Endpoint Address Encoding  . . . . . . . . . . .   8
       5.2.1.  Address Type  . . . . . . . . . . . . . . . . . . . .   8
       5.2.2.  Endpoint Address  . . . . . . . . . . . . . . . . . .   8
       5.2.3.  Extended Endpoint Address Examples  . . . . . . . . .   9
     5.3.  Flow-based Endpoint Cost Service  . . . . . . . . . . . .   9
       5.3.1.  Capabilities  . . . . . . . . . . . . . . . . . . . .   9
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