ALTO Extension: Unified Resource Representation
draft-xiang-alto-unified-representation-00

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ALTO WG                                                         Q. Xiang
Internet-Draft                                    Tongji/Yale University
Intended status: Standards Track                                   F. Le
Expires: January 2, 2019                                             IBM
                                                                 Y. Yang
                                                  Tongji/Yale University
                                                            July 1, 2018

            ALTO Extension: Unified Resource Representation
             draft-xiang-alto-unified-representation-00.txt

Abstract

   The ALTO protocol [RFC7285] provides network information to
   applications so that applications can make network informed decisions
   to improve the performance.  However, the base ALTO protocol only
   provides coarse-grained end-to-end metrics, which are insufficient to
   satisfy the demands of applications to solve more complex network
   optimization problems.  The ALTO Path Vector extension [DRAFT-PV] has
   been introduced to allow ALTO clients to query information such as
   capacity regions for a given set of flows.  However, the current
   design of this extension has a limited expressiveness.  The goal of
   this document is to introduce a unified resource representation
   service as an extension of ALTO (ALTO-UR), which allows the ALTO
   clients to query and get the capacity regions of more complex
   resource information, such as Shared-Risk-Link-Group (SRLG), multi-
   path routing, multicast and on-demand routing, for a given set of
   flows.

Status of This Memo

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   This Internet-Draft will expire on January 2, 2019.

Xiang, et al.            Expires January 2, 2019                [Page 1]
Internet-Draft           Unified Representation                July 2018

Copyright Notice

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   document authors.  All rights reserved.

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Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
   2.  Requirements Language . . . . . . . . . . . . . . . . . . . .   3
   3.  Limitations of the ALTO Path Vector Extension . . . . . . . .   3
   4.  Overview of the Unified Representation Extension  . . . . . .   5
     4.1.  Basic idea  . . . . . . . . . . . . . . . . . . . . . . .   5
     4.2.  New Cost Type to Encode Mathematical Programming
           Variables . . . . . . . . . . . . . . . . . . . . . . . .   6
       4.2.1.  Cost Mode: array  . . . . . . . . . . . . . . . . . .   6
       4.2.2.  Cost Metric: variable-list  . . . . . . . . . . . . .   6
     4.3.  New Entity Domain to Provide Mathematical Programming
           Constraints . . . . . . . . . . . . . . . . . . . . . . .   7
     4.4.  Multipart Response to Provide the Unified Representation    7
   5.  Example . . . . . . . . . . . . . . . . . . . . . . . . . . .   7
     5.1.  Protocol Extension  . . . . . . . . . . . . . . . . . . .   7
     5.2.  Workflow  . . . . . . . . . . . . . . . . . . . . . . . .   7
     5.3.  Information Resource Directory Example  . . . . . . . . .   8
     5.4.  Cost Map Service Example  . . . . . . . . . . . . . . . .   9
   6.  Security and Privacy Considerations . . . . . . . . . . . . .  11
   7.  References  . . . . . . . . . . . . . . . . . . . . . . . . .  11
     7.1.  Normative References  . . . . . . . . . . . . . . . . . .  11
     7.2.  Informative References  . . . . . . . . . . . . . . . . .  11
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .  12

1.  Introduction

   As discussed in [DRAFT-PV], the "one-big-switch" abstraction used in
   the ALTO base protocol lacks the ability to support emerging use
   cases, such as inter-datacenter data transfers, because this
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