OSI connectionless transport services on top of UDP: Version 1 (RFC1240)
Original Publication Date: 1991-Jun-01
Included in the Prior Art Database: 2019-Feb-11
Internet Society Requests For Comment (RFCs)
C. Shue: AUTHOR [+2]
This document describes a protocol for running OSI Connectionless service on UDP. [STANDARDS-TRACK]
Network Working Group C. Shue Request for Comments: 1240 Open Software Foundation W. Haggerty Wang Laboratories, Inc. K. Dobbins Cabletron Systems, Inc. June 1991
OSI Connectionless Transport Services on top of UDP Version: 1
Status of this Memo
This document describes a protocol for running OSI Connectionless service on UDP. This RFC specifies an IAB standards track protocol for the Internet community, and requests discussion and suggestions for improvements. Please refer to the current edition of the "IAB Official Protocol Standards" for the standardization state and status of this protocol. Distribution of this memo is unlimited.
1. Introduction and Philosophy
The Internet community has a well-developed, mature set of layered transport and network protocols, which are quite successful in offering both connection-oriented (TCP) and connectionless (UDP) transport services over connectionless network services (IP) to end- users. Many popular network applications have been built directly on top of the TCP and UDP over the past decade. These have helped the Internet services and protocols to become widely-spread de facto standards. In the past few years, the ISO and CCITT have defined a well-architected set of upper layer standards which include connection-oriented and connectionless session, presentation, and application layer services and protocols. These OSI upper layer standards offer valuable services to application developers (e.g., dialogue control, transfer syntax, peer authentication, directory services, etc.) which are not currently offered by the TCP/IP standards.
As indicated in RFC 1006, it is desirable to offer the OSI upper layer services directly in the Internet without disrupting existing facilities. This permits a more graceful convergence and transition strategy from IP-based networks to OSI-based networks in the future. Using the approach of RFC 1006, this memo specifies how to offer OSI connectionless transport service using the User Datagram Protocol (UDP) [RFC768] of the TCP/IP suite.
We will define a Transport Service Access Point (TSAP) which appears
Shue, Haggerty & Dobbins [Page 1]
RFC 1240 OSI on top of UDP June 1991
to be identical to the services and interfaces defined in ISO 8072 and its Addendum 1, but we will in fact implement the ISO T-UNIT-DATA protocol on top of UDP. By this means, OSI TPDU’s can be delivered across the Internet network, and OSI connectionless upper layers can operate fully without knowledge of the fact that they are running on top of UDP/IP. In essence, the OSI T-UNIT-DATA service will use UDP as its connectionless network service provider.
The primary motivation for the standard described in this memo is to facilitate the process of gaining experience with OSI connectionless upper layers protocols, i.e., S-UNIT-DATA [ISO9548], P-UNIT-DATA [ISO9576] and A-UNIT-DATA [ISO10035], and connectionless transport protocol T-UNIT-DATA [ISO8602].
Though many OSI standard applications suc...