ALTO Performance Cost Metrics

Document Type Active Internet-Draft (alto WG)
Last updated 2020-07-13
Replaces draft-wu-alto-te-metrics
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ALTO Working Group                                                 Q. Wu
Internet-Draft                                                    Huawei
Intended status: Standards Track                                 Y. Yang
Expires: January 13, 2021                                Yale University
                                                                  Y. Lee
                                                                D. Dhody
                                                          S. Randriamasy
                                                         Nokia Bell Labs
                                                            L. Contreras
                                                           July 12, 2020

                     ALTO Performance Cost Metrics


   Cost metric is a basic concept in Application-Layer Traffic
   Optimization (ALTO), and is used in basic ALTO services including
   both the cost map service and the endpoint cost service.

   Different applications may use different cost metrics, but the ALTO
   base protocol [RFC7285] defines only a single cost metric, i.e., the
   generic "routingcost" metric; see Sec. 14.2 of [RFC7285].  Hence, if
   the ALTO client of an application wants to issue a cost map or an
   endpoint cost request to determine the resource provider that offers
   better delay performance (i.e., low-delay) to a resource consumer,
   the base protocol does not define the cost metric to be used.

   This document addresses the issue by introducing network performance
   metrics, including network delay, jitter, packet loss rate, hop
   count, and bandwidth.  The ALTO server may derive and aggregate such
   performance metrics from routing protocols such as BGP-LS, OSPF-TE
   and ISIS-TE, or from end-to-end traffic management tools, and then
   expose the information to allow applications to determine "where" to
   connect based on network performance criteria.

   There are multiple sources to derive the performance metrics.  For
   example, whether the metric reported is an estimation based on
   measurements or it is a service-level agreement (SLA) can define the
   meaning of the performance metric.  Hence, an application may need
   additional contextual information beyond the metric value.  This
   document introduces an additional "cost-context" field to the ALTO
   "cost-type" field to convey such information.

Wu, et al.              Expires January 13, 2021                [Page 1]
Internet-Draft        ALTO Performance Cost Metrics            July 2020

   Requirements Language The key words "MUST", "MUST NOT", "REQUIRED",
   and "OPTIONAL" in this document are to be interpreted as described in

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Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   4
   2.  Performance Metric Attributes . . . . . . . . . . . . . . . .   5
     2.1.  Performance Metric Context: cost-context  . . . . . . . .   6
     2.2.  Performance Metric Statistics . . . . . . . . . . . . . .   8
   3.  Packet Performance Metrics  . . . . . . . . . . . . . . . . .   9
     3.1.  Cost Metric: One-Way Delay (delay-ow) . . . . . . . . . .   9
       3.1.1.  Base Identifier . . . . . . . . . . . . . . . . . . .  10
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