ALTO Cost Calendar
Network Working Group S. Randriamasy
Internet-Draft Nokia Bell Labs
Intended status: Standards Track R. Yang
Expires: January 4, 2018 Yale University
July 3, 2017
ALTO Cost Calendar
The goal of Application-Layer Traffic Optimization (ALTO) is to
bridge the gap between network and applications by provisioning
network related information in order to allow applications to make
network informed decisions. The present draft extends the ALTO cost
information so as to broaden the decision possibilities of
applications to not only decide 'where' to connect to, but also
'when'. This is useful to applications that need to schedule their
data transfers and connections and have a degree of freedom to do so.
ALTO guidance to schedule application traffic can also efficiently
help for load balancing and resources efficiency. Besides, the ALTO
Cost Calendar allows to schedule the ALTO requests themselves and
thus to save a number of ALTO transactions.
This draft proposes new capabilities and attributes on filtered cost
maps and endpoint costs enabling an ALTO Server to provide "Cost
Calendars". These capabilities are applicable to time-sensitive ALTO
metrics. With ALTO Cost Calendars, 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 IRD and ALTO Server responses.
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].
Randriamasy, et al. Expires January 4, 2018 [Page 1]
Internet-Draft ALTO Cost Calendar July 2017
Status of This Memo
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Table of Contents
1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . 3
2. Overview of ALTO Cost Calendars . . . . . . . . . . . . . . . 4
2.1. ALTO Cost Calendar information features . . . . . . . . . 5
2.2. ALTO Calendar design characteristics . . . . . . . . . . 6
2.2.1. ALTO Cost Calendar for all cost modes . . . . . . . . 6
2.2.2. Compatibility with legacy ALTO Clients . . . . . . . 7
3. ALTO Calendar specification: IRD extensions . . . . . . . . . 7
3.1. Calendar attributes in the IRD resources capabilities . . 7
3.2. Calendars in a delegate IRD . . . . . . . . . . . . . . . 9
3.3. Example IRD with ALTO Cost Calendars . . . . . . . . . . 9
4. ALTO Calendar specification: Service Information Resources . 12
4.1. Calendar extensions for Filtered Cost Maps . . . . . . . 12
4.1.1. Calendar extensions in Filtered cost map requests . . 13
4.1.2. Calendar extensions in Filtered Cost map responses . 13
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