RFC 9240

An Extension for Application-Layer Traffic Optimization (ALTO): Entity Property Maps, July 2022

File formats:

icon for HTML icon for text file icon for v3pdf icon for XML
Also available: XML file for editing
W. Roome
S. Randriamasy
Y. Yang
J. Zhang
K. Gao
alto (ops)

Cite this RFC: TXT  |  XML  |   BibTeX

DOI:  https://doi.org/10.17487/RFC9240

Discuss this RFC: Send questions or comments to the mailing list alto@ietf.org

Other actions: Submit Errata  |  Find IPR Disclosures from the IETF  |  View History of RFC 9240


This document specifies an extension to the base Application-Layer Traffic Optimization (ALTO) Protocol that generalizes the concept of "endpoint properties", which have been tied to IP addresses so far, to entities defined by a wide set of objects. Further, these properties are presented as maps, similar to the network and cost maps in the base ALTO Protocol. While supporting the endpoints and related Endpoint Property Service defined in RFC 7285, the ALTO Protocol is extended in two major directions. First, from endpoints restricted to IP addresses to entities covering a wider and extensible set of objects; second, from properties for specific endpoints to entire entity property maps. These extensions introduce additional features that allow entities and property values to be specific to a given information resource. This is made possible by a generic and flexible design of entity and property types.

For the definition of Status, see RFC 2026.

For the definition of Stream, see RFC 8729.

Advanced Search