ALTO Performance Cost Metrics
draft-ietf-alto-performance-metrics-03
ALTO Working Group Q. Wu
Internet-Draft Huawei
Intended status: Standards Track Y. Yang
Expires: June 25, 2018 Yale University
Y. Lee
D. Dhody
Huawei
S. Randriamasy
Nokia Bell Labs
December 22, 2017
ALTO Performance Cost Metrics
draft-ietf-alto-performance-metrics-03
Abstract
Cost Metric is a basic concept in Application-Layer Traffic
Optimization (ALTO). It is used in both the Cost Map Service and the
Endpoint Cost Service.
Different applications may benefit from different Cost Metrics. For
example, a Resource Consumer may prefer Resource Providers that offer
a low delay delivery to the Resource Consumer. However the base ALTO
protocol [ALTO] has documented only one single cost metric, i.e., the
generic "routingcost" metric (Sec. 14.2 of ALTO base specification
[ALTO]).
This document, proposes a set of Cost Metrics, derived and aggregated
from routing protocols with different granularity and scope, such as
BGP-LS,OSPF-TE and ISIS-TE, or from end-to-end traffic management
tools. It currently documents Network Performance Cost Metrics
reporting on network delay, jitter, packet loss, hop count, and
bandwidth. These metrics may be exposed by an ALTO Server to allow
applications to determine "where" to connect based on network
performance criteria. Additional Cost Metrics involving ISP specific
considerations or other network technologies may be documented in
further versions of this draft.
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].
Wu, et al. Expires June 25, 2018 [Page 1]
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Status of This Memo
This Internet-Draft is submitted in full conformance with the
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This Internet-Draft will expire on June 25, 2018.
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Table of Contents
1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . 3
2. Challenges on data sources and computation of ALTO
performance metrics . . . . . . . . . . . . . . . . . . . . . 5
2.1. Data sources Challenge . . . . . . . . . . . . . . . . . 5
2.2. ALTO performance metrics Computation Challenges . . . . . 5
2.2.1. Configuration Parameters Challenge . . . . . . . . . 5
2.2.2. Availability of end to end path values Challenge . . 6
3. Cost Metric: POWDelay . . . . . . . . . . . . . . . . . . . . 6
4. Cost Metric: RTT . . . . . . . . . . . . . . . . . . . . . . 8
5. Cost Metric: PDV . . . . . . . . . . . . . . . . . . . . . . 10
6. Cost Metric: Hop Count . . . . . . . . . . . . . . . . . . . 12
7. Cost Metric: Packet Loss . . . . . . . . . . . . . . . . . . 14
8. Traffic Engineering Performance Cost Metrics . . . . . . . . 16
8.1. Cost Metric: Link Maximum Reservable Bandwidth . . . . . 17
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