ALTO Performance Cost Metrics
draft-ietf-alto-performance-metrics-15
ALTO Working Group Q. Wu
Internet-Draft Huawei
Intended status: Standards Track Y. Yang
Expires: August 7, 2021 Yale University
Y. Lee
Samsung
D. Dhody
Huawei
S. Randriamasy
Nokia Bell Labs
L. Contreras
Telefonica
February 3, 2021
ALTO Performance Cost Metrics
draft-ietf-alto-performance-metrics-15
Abstract
Cost metric is a basic concept in Application-Layer Traffic
Optimization (ALTO), and different applications may use different
cost metrics. Since the ALTO base protocol (RFC 7285) defines only a
single cost metric (i.e., the generic "routingcost" metric), if an
application wants to issue a cost map or an endpoint cost request to
determine the resource provider that offers better delay performance,
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.
There are multiple sources (e.g., estimation based on measurements or
service-level agreement) to derive a performance metric. This
document introduces an additional "cost-context" field to the ALTO
"cost-type" field to convey the source of a performance metric.
Requirements Language
The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT",
"SHOULD", "SHOULD NOT", "RECOMMENDED", "NOT RECOMMENDED", "MAY", and
"OPTIONAL" in this document are to be interpreted as described in BCP
14 [RFC2119][RFC8174] when, and only when, they appear in all
capitals, as shown here.
Wu, et al. Expires August 7, 2021 [Page 1]
Internet-Draft ALTO Performance Cost Metrics February 2021
Status of This Memo
This Internet-Draft is submitted in full conformance with the
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This Internet-Draft will expire on August 7, 2021.
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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) . . . . . . . . . . 10
3.1.1. Base Identifier . . . . . . . . . . . . . . . . . . . 10
3.1.2. Value Representation . . . . . . . . . . . . . . . . 10
3.1.3. Intended Semantics and Use . . . . . . . . . . . . . 10
3.1.4. Cost-Context Specification Considerations . . . . . . 12
3.2. Cost Metric: Round-trip Delay (delay-rt) . . . . . . . . 12
3.2.1. Base Identifier . . . . . . . . . . . . . . . . . . . 12
3.2.2. Value Representation . . . . . . . . . . . . . . . . 12
3.2.3. Intended Semantics and Use . . . . . . . . . . . . . 12
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