[rfc-dist] RFC 9439 on Application-Layer Traffic Optimization (ALTO) Performance Cost Metrics

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        RFC 9439

        Title:      Application-Layer Traffic Optimization (ALTO) 
                    Performance Cost Metrics 
        Author:     Q. Wu,
                    Y. Yang,
                    Y. Lee,
                    D. Dhody,
                    S. Randriamasy,
                    L. Contreras
        Status:     Standards Track
        Stream:     IETF
        Date:       August 2023
        Mailbox:    bill.wu@huawei.com,
                    yry@cs.yale.edu,
                    younglee.tx@gmail.com,
                    dhruv.ietf@gmail.com,
                    sabine.randriamasy@nokia-bell-labs.com,
                    luismiguel.contrerasmurillo@telefonica.com
        Pages:      35
        Updates/Obsoletes/SeeAlso:   None

        I-D Tag:    draft-ietf-alto-performance-metrics-28.txt

        URL:        https://www.rfc-editor.org/info/rfc9439

        DOI:        10.17487/RFC9439

The cost metric is a basic concept in Application-Layer Traffic
Optimization (ALTO), and different applications may use different
types of cost metrics. Since the ALTO base protocol (RFC 7285)
defines only a single cost metric (namely, the generic "routingcost"
metric), if an application wants to issue a cost map or an endpoint
cost request in order to identify a resource provider that offers
better performance metrics (e.g., lower delay or loss rate), the base
protocol does not define the cost metric to be used.

This document addresses this issue by extending the specification to
provide a variety of network performance metrics, including network
delay, delay variation (a.k.a. jitter), packet loss rate, hop count,
and bandwidth.

There are multiple sources (e.g., estimations based on measurements
or a Service Level Agreement) available for deriving 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.

This document is a product of the Application-Layer Traffic Optimization Working Group of the IETF.

This is now a Proposed Standard.

STANDARDS TRACK: This document specifies an Internet Standards Track
protocol for the Internet community, and requests discussion and suggestions
for improvements.  Please refer to the current edition of the Official
Internet Protocol Standards (https://www.rfc-editor.org/standards) for the 
standardization state and status of this protocol.  Distribution of this 
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