Application-Layer Traffic Optimization (ALTO) Cost Calendar
RFC 8896
Internet Engineering Task Force (IETF) S. Randriamasy
Request for Comments: 8896 Nokia Bell Labs
Category: Standards Track Y. Yang
ISSN: 2070-1721 Yale University
Q. Wu
Huawei
L. Deng
China Mobile
N. Schwan
Thales Deutschland
November 2020
Application-Layer Traffic Optimization (ALTO) Cost Calendar
Abstract
This document is an extension to the base Application-Layer Traffic
Optimization (ALTO) protocol. It extends the ALTO cost information
service so that applications decide not only 'where' to connect but
also 'when'. This is useful for applications that need to perform
bulk data transfer and would like to schedule these transfers during
an off-peak hour, for example. This extension introduces the ALTO
Cost Calendar with which an ALTO Server exposes ALTO cost values in
JSON arrays where each value corresponds to a given time interval.
The time intervals, as well as other Calendar attributes, are
specified in the Information Resources Directory and ALTO Server
responses.
Status of This Memo
This is an Internet Standards Track document.
This document is a product of the Internet Engineering Task Force
(IETF). It represents the consensus of the IETF community. It has
received public review and has been approved for publication by the
Internet Engineering Steering Group (IESG). Further information on
Internet Standards is available in Section 2 of RFC 7841.
Information about the current status of this document, any errata,
and how to provide feedback on it may be obtained at
https://www.rfc-editor.org/info/rfc8896.
Copyright Notice
Copyright (c) 2020 IETF Trust and the persons identified as the
document authors. All rights reserved.
This document is subject to BCP 78 and the IETF Trust's Legal
Provisions Relating to IETF Documents
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described in the Simplified BSD License.
Table of Contents
1. Introduction
1.1. Some Recent Known Uses
1.2. Terminology
2. Requirements Language
3. Overview of ALTO Cost Calendars and Terminology
3.1. ALTO Cost Calendar Overview
3.2. ALTO Cost Calendar Information Features
3.3. ALTO Calendar Design Characteristics
3.3.1. ALTO Cost Calendar for All Cost Modes
3.3.2. Compatibility with Legacy ALTO Clients
4. ALTO Calendar Specification: IRD Extensions
4.1. Calendar Attributes in the IRD Resource Capabilities
4.2. Calendars in a Delegate IRD
4.3. Example IRD with ALTO Cost Calendars
5. ALTO Calendar Specification: Service Information Resources
5.1. Calendar Extensions for Filtered Cost Maps (FCM)
5.1.1. Calendar Extensions in Filtered Cost Map Requests
5.1.2. Calendar Extensions in Filtered Cost Map Responses
5.1.3. Use Case and Example: FCM with a Bandwidth Calendar
5.2. Calendar Extensions in the Endpoint Cost Service
5.2.1. Calendar-Specific Input in Endpoint Cost Requests
5.2.2. Calendar Attributes in the Endpoint Cost Response
5.2.3. Use Case and Example: ECS with a routingcost Calendar
5.2.4. Use Case and Example: ECS with a Multi-cost Calendar
for routingcost and owdelay
6. IANA Considerations
7. Security Considerations
8. Operational Considerations
9. References
9.1. Normative References
9.2. Informative References
Acknowledgments
Authors' Addresses
1. Introduction
The base Application-Layer Traffic Optimization (ALTO) protocol
specified in [RFC7285] provides guidance to overlay applications that
need to select one or several hosts from a set of candidates able to
provide a desired resource. This guidance is based on parameters
that affect performance and efficiency of the data transmission
between the hosts, such as the topological distance. The goal of
ALTO is to improve the Quality of Experience (QoE) in the application
while optimizing resource usage in the underlying network
infrastructure.
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