Architecture and Requirements for Transport Services
RFC 9621, “Architecture and Requirements for Transport Services”, is a Proposed Standard document published in January 2025 by T. Pauly, B. Trammell, A. Brunstrom, G. Fairhurst, C. S. Perkins. The canonical text is published by the RFC Editor.
Abstract
This document describes an architecture that exposes transport protocol features to applications for network communication. The Transport Services Application Programming Interface (API) is based on an asynchronous, event-driven interaction pattern. This API uses Messages for representing data transfer to applications and describes how a Transport Services Implementation can use multiple IP addresses, multiple protocols, and multiple paths and can provide multiple application streams. This document provides the architecture and requirements. It defines common terminology and concepts to be used in definitions of a Transport Services API and a Transport Services Implementation.
What “Proposed Standard” means
An entry-level standards-track specification: stable, peer-reviewed and a solid basis for implementation, though it may still evolve before becoming an Internet Standard.
The canonical text of RFC 9621 is hosted at rfc-editor.org. Available in HTML,TXT,PDF,XML.
- RFC 9622 An Abstract Application Programming Interface for Transport Services
- RFC 9623 Implementing Interfaces to Transport Services
- RFC 9626 Video Frame Marking RTP Header Extension
- RFC 9627 The Layer Refresh Request RTCP Feedback Message
- RFC 9628 RTP Payload Format for VP9 Video
- RFC 9609 Initializing a DNS Resolver with Priming Queries
- RFC 9664 An EDNS Option to Negotiate Leases on DNS Updates
- RFC 9665 Service Registration Protocol for DNS-Based Service Discovery