Application-Layer Traffic Optimization (ALTO) Performance Cost Metrics

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Publisher: IETF
Doc Type: Standard
Pages: 35
Abstract: 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.
Publication Date: 2023-08-01
Status Note: Proposed Standard
DOI: 10.17487/RFC9439
Link: https://doi.org/10.17487/RFC9439
Author(s): Qin Wu
Y. Richard Yang
Young Lee
Dhruv Dhody
Sabine Randriamasy
Luis M. Contreras
Keyword(s): JSON, ALTO

Latest version of IETF RFC 9439

Document Versions — IETF RFC 9439

▶ IETF RFC 9439 (2023-08-01)

THIS DOC [ACTIVE] [LATEST VERSION]

Normative Reference(s)

IANA, "Performance Metrics", <https://www.iana.org/assignments/performance-metrics/>. EXTERNAL
IETF RFC 2119 [Active*]
IETF RFC 3630 [Active*]
IETF RFC 5305 [Active*]
IETF RFC 6390 [Active*]
IETF RFC 7285 [Active*]
IETF RFC 7471 [Active*]
IETF RFC 8126 [Active*]
IETF RFC 8174 [Active*]
IETF RFC 8259 [Active*]
IETF RFC 8446 [Superseded*]
IETF RFC 8570 [Active*]
IETF RFC 8571 [Active*]
RFC8895 — RFC8895 EXTERNAL
IETF RFC 9110 [Active*]
IETF RFC 9438 [Active*]

Bibliographic Reference(s)

10.1109-TNET.2020.3016838 — Prophet EXTERNAL
10.1145-3366707 — G2 EXTERNAL
IETF.draft-corre-quic-throughput-testing-00 — I-D.corre-quic-throughput-testing EXTERNAL
Volz, J. and B. Rabenstein, "Prometheus: A Next-Generation Monitoring System (Talk)", SREcon15 Europe, May 2015. EXTERNAL
Pujol, E., Poese, I., Zerwas, J., Smaragdakis, G., and A. Feldmann, "Steering Hyper-Giants' Traffic at Scale", ACM CoNEXT '19, December 2019. EXTERNAL
IETF RFC 2330 [Active*]
IETF RFC 2681 [Active*]
IETF RFC 3393 [Active*]
IETF RFC 5357 [Active*]
IETF RFC 7679 [Active*]
RFC7971 — RFC7971 EXTERNAL
IETF RFC 9000 [Active*]

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Referenced By

IETF RFC 9522 [Active*]