ALTO Extension: Unified Resource Representation
draft-xiang-alto-unified-representation-01

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ALTO WG                                                         Q. Xiang
Internet-Draft                                           Yale University
Intended status: Standards Track                                   F. Le
Expires: September 12, 2019                                          IBM
                                                                 Y. Yang
                                                         Yale University
                                                          March 11, 2019

            ALTO Extension: Unified Resource Representation
             draft-xiang-alto-unified-representation-01.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 September 12, 2019.

Xiang, et al.          Expires September 12, 2019               [Page 1]
Internet-Draft           Unified Representation               March 2019

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   document authors.  All rights reserved.

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Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
   2.  Requirements Language . . . . . . . . . . . . . . . . . . . .   3
   3.  Changes Since Version -00 . . . . . . . . . . . . . . . . . .   3
   4.  Limitations of the ALTO Path Vector Extension . . . . . . . .   3
   5.  Overview of the Unified Representation Extension  . . . . . .   5
     5.1.  Basic idea  . . . . . . . . . . . . . . . . . . . . . . .   5
     5.2.  New Cost Type to Encode Mathematical Programming
           Variables . . . . . . . . . . . . . . . . . . . . . . . .   6
       5.2.1.  Cost Mode: array  . . . . . . . . . . . . . . . . . .   6
       5.2.2.  Cost Metric: variable-list  . . . . . . . . . . . . .   6
     5.3.  New Entity Domain to Provide Mathematical Programming
           Constraints . . . . . . . . . . . . . . . . . . . . . . .   7
     5.4.  Multipart Response to Provide the Unified Representation    7
     5.5.  Designing New Interfaces for More Flexible Queries  . . .   7
   6.  Example . . . . . . . . . . . . . . . . . . . . . . . . . . .   8
     6.1.  Protocol Extension  . . . . . . . . . . . . . . . . . . .   8
     6.2.  Workflow  . . . . . . . . . . . . . . . . . . . . . . . .   9
     6.3.  Information Resource Directory Example  . . . . . . . . .   9
     6.4.  Cost Map Service Example  . . . . . . . . . . . . . . . .  10
   7.  Security and Privacy Considerations . . . . . . . . . . . . .  12
   8.  References  . . . . . . . . . . . . . . . . . . . . . . . . .  12
     8.1.  Normative References  . . . . . . . . . . . . . . . . . .  12
     8.2.  Informative References  . . . . . . . . . . . . . . . . .  12
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .  13

1.  Introduction

   As discussed in [DRAFT-PV], the "one-big-switch" abstraction used in
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