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RFC 9388
Title: Content Delivery Network Interconnection (CDNI)
Footprint Types: Country Subdivision Code and
Footprint Union
Author: N. Sopher,
S. Mishra
Status: Standards Track
Stream: IETF
Date: July 2023
Mailbox: [email protected],
[email protected]
Pages: 11
Updates: RFC 8008
I-D Tag: draft-ietf-cdni-additional-footprint-types-12.txt
URL: https://www.rfc-editor.org/info/rfc9388
DOI: 10.17487/RFC9388
Open Caching architecture is a use case of Content Delivery Network
Interconnection (CDNI) in which the commercial Content Delivery
Network (CDN) is the upstream CDN (uCDN) and the ISP caching layer
serves as the downstream CDN (dCDN). RFC 8006 defines footprint types
that are used for footprint objects as part of the Metadata interface
(MI). The footprint types are also used for the Footprint &
Capabilities Advertisement interface (FCI) as defined in RFC 8008.
This document defines two new footprint types. The first footprint
type defined is an ISO 3166-2 country subdivision code. Defining this
country subdivision code improves granularity for delegation as
compared to the ISO 3166-1 country code footprint type defined in RFC
8006. The ISO 3166-2 country subdivision code is also added as a new
entity domain type in the "ALTO Entity Domain Types" registry defined
in Section 7.4 of RFC 9241. The second footprint type defines a
footprint union to aggregate footprint objects. This allows for
additive semantics over the narrowing semantics defined in Appendix B
of RFC 8008 and therefore updates RFC 8008. The two new footprint
types are based on the requirements raised by Open Caching but are
also applicable to CDNI use cases in general.
This document is a product of the Content Delivery Networks Interconnection
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
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