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ENTERPRISE Nelworking with SNA TYPE 2.1 NODES ENTERPRISE NElWORKING WITH SNA TYPE 2.1 NODES GG24-3433-00 Enterprise Networking with SNA Type 2.1 Nodes Document Number GG24-3433 November 1989 International Technical Support Center Raleigh, North Carolina FIRST EDmON, November 1989. This is the first edition of GG24-3433. References in this publication to IBM products, programs, or services do not imply that IBM intends to make these available in all countries in which IBM operates. Any reference to an IBM program product in this document is not intended to state or imply that only IBM's program product may be used. Any func­ tionally equivalent program may be used instead. The information contained in this document has not been submitted to any formal IBM test and is distrib­ uted on an 'As Is' basis without any warranty either express or implied. The use of this information or the implementation of any of these techniques is a customer responsibility and depends on the customer's ability to evaluate and integrate them into the customer's operational environment. While each item may have been reviewed by IBM for accuracy in a specific situation, there is no guarantee that the same or similar results will be obtained elsewhere. Customers attempting to adapt these techniques to their own environ­ ments do so at their own risk. Publications are not stocked at the address given below. Requests for IBM publications should be made to the IBM branch office serving your locality. A form for reader's comments is provided at the back of this publication. If the form has been removed, comments may be addressed to IBM Corporation, International Technical Support Center, Dept. 985, B657, P. O. Box 12195, Research Triangle Park, NC 27709. IBM may use or distribute whatever information you supply in any way it believes appropriate without incurring any obligation to you. Application System/400, AS/400, ES/3090, 3090, ES/9370, System/360, System/370, MVS/SP, MVS/XA, NCP, APPN, NetView, NetView/PC, Operating System/2, OS/2, Operating System/400, OS/400, Personal Computer XT, PC/XT, System/36, System/38 are trademarks of the International Business Machines Cor­ poration. IBM, Personal Computer AT, AT, Personal System/2, PS/2, RT Personal Computer, RT PC, RT are regis­ tered trademarks of the International Business Machines Corporation. Ethernet is a trademark of the Xerox Corporation. © Copyright International Business Machines Corporation 1989 Abstract This publication presents a broad tutorial on the new "any-to-any" networking capability of SNA. Named "SNA Type 2.1 node support," this is a key new function of SNA. "SNA Type 2.1 node support" also provides for the integration of small ("Low Entry Networking" and "APPN" networks) into the SNA wide area network and for the full support of the new function provided by "APPC" (or LU6.2) protocols. Primarily intended for technical planners, this book is written at a "technical understanding" (or conceptual) level. It discusses in some detail the technical characteristics of the new function and some of the new application possibilities that have become available. A focus of the book is the newly announced SNA Type 2.1 node support for VM/VTAM on the IBM ES/9370 system although the discussion also applies to the similar function already available for the larger /370 systems through the "SNA Type 2.1 node support" feature of NCP. CSYS (195 pages) Abstract iii iv T 2.1 Enterprise Networking Acknowledgements The author of this document is: • Harry J.R. Dutton, IBM Australia Limited Project Advisor: • Roland Peschke, IBM International Technical Support Center, Raleigh This publication is the product of a residency conducted at the International Technical Support Center, Raleigh. Thanks are due to the following people. • Gerard Joseph, IBM Australia Limited for permission to reproduce the Appendix "SNA Type 2.1 Node Overview" from An Introduction to Advanced Program-to-Program Communication (APPC), (GG24-1584-1). • Hans H. pfeiffer, IBM International Technical Support Center, Rochester for permission to include material from IBM AS/400 Advanced Peer To Peer Networking (APPN) (GG 24-3287-0). • Bob Gibbs, IBM Communications Systems Division, Raleigh for technical consultation and advice. • Jeff Mason, IBM Communications Systems Division, Raleigh for assistance with the Bibliography and the Glossary. • Gail Wojton, IBM International Technical Support Center, Raleigh for editorial assistance and review. Acknowledgements V vi T 2.1 Enterprise Networking Preface This publication is a systems engineering technical paper, NOT a product manual. Its purpose is to assist the reader in understanding the wider issues relating to the interconnection of IBM products. It should be regarded by the reader in the same way as a paper published in a professional journal or read at a technical conference. The perspective and orientation reflect the professional opinion of the author and not necessarily the policy or intent of IBM. Detailed information about IBM products is given here incidental to objectives of the document and while every effort has been made to ensure accuracy, such information should not be considered authoritative. Authoritative information about IBM products is contained in the official product manuals. A bibliography of some of these publications may be found in "Bibliography" on page 177. Purpose and Scope Over the past few years, IBM has introduced major new networking function into Systems Network Architecture (SNA). This function provides the user with a significantly wider range of interconnection possibilities and hence a much richer variety of application alternatives. There have been many individual enhancements which despite their "jargon" names have added important functions to SNA. These enhancements are a little like a jigsaw. Taken individually, each is significant in and of itself. But taken together, they form a total capability which as a whole is substantially greater than the sum of its individual parts. The most recent enhancement is called "SNA Type 2.1 node support". This was announced for large systems in 1987 and delivered in 1988. In 1989, IBM is extending this support to smaller IBM ES/9370 systems. T2.l node support means that an SNA network is now able to provide direct communication between any two "boxes" attached to the SNA network provided that each "box" uses the T2.l node attachment protocol. It also means that SNA networks and networks of small systems (called APPN networks) can be interconnected in a natural and convenient way. Further, T2.1 node support enables another new feature, called LV 6.2,1 to be used to its fullest potential. This book is about any-to-any connectivity in SNA networks. It is intended that the reader gain an understanding of the function provided, its advantages and limitations and, most important, the kinds of new application possibilities that are now open to the system designer. Audience This document is intended for persons wishing to gain an understanding of the new SNA functions and their use. Systems designers wishing to implement applications solutions incorporating distributed processing will find that the discussion in Chapter 3 will suggest a new range of options. 1 Also called APPC or Advanced Program-to-Program Communication Preface vii Network planners will fmd that Chapters 2 and 5 will convey an understanding of the new function and will provide the necessary understanding for network planning. Systems programmers will fmd a useful background to the product details to be found in other documents. IBM systems engineers should fmd information to suggest new problem solutions and application possibilities. Chapter 3, "Systems Examples" on page 21 deals with the additional function available to SNA users as a result of SNA Type 2.1 node support. As such it is the most important part of the document. Other chapters serve either to introduce and provide background to the subject for the generalist reader or to provide some detail for the technically inquisitive. Organization This publication is divided seven chapters and four appendices: Chapter 1, "Introduction" on page 3 Introduces the concept of the S NA Type 2.1 node and places it in the context of Enterprise Networking. Chapter 2, "Overview of New Functions" on page 7 This chapter spells out the functions of VTAM V3 R3 and NCP V5 R3 as they relate to the T2.1 node connection support. Chapter 3, "Systems Examples" on page 21 This is perhaps the most important section in the document. Addressed to network planners and IBM systems engineers, it contains a discussion of system design possibilities in relation to other IBM networking products. It is intended to suggest how the T2.1 node support can be used to solve some common systems design problems. Chapter 4, "Technical Background" on page 45 This chapter contains a "technical conceptual" discussion of the developments in SNA that led up to the "T2.1 node support" and of its objectives. Chapter 5, "Principles of Operation" on page 65 A more detailed technical description (again at a conceptual level) is presented in this chapter. It is intended to introduce a reader who has some prior SNA knowledge to the concepts relevant to T2.1 node connection. Chapter 6, "Token-Ring (TRN) Connection" on page 83 Token Ring "gateways" are very necessary to the enterprise network. However, TRN gateways offer different levels of T2.1 node capability. This chapter discusses the issues relating to use of TRN gateways. Chapter 7, "Technical Details" on page 89 This chapter is not for the faint-hearted. It contains a sometimes detailed discussion of individual characteristics of SNA as they relate to the T2.1 node attachment. Readers of this chapter are expected to have considerable prior SNA knowledge (albeit at the conceptual level). Chapter 8, "VTAM V3.3 Installation Planning" on page 119 This chapter discusses the T2.1 node implementation in ES/9370 VM/VTAM.
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