CAN CSA-ISO IEC 8473-1-2001 Information Technology - Protocol for Providing the Connectionless-Mode Network Service Protocol Specification.pdf

1、 National Standard of CanadaCAN/CSA-ISO/IEC 8473-1-01(ISO/IEC 8473-1:1998)International Standard ISO/IEC 8473-1:1998 (second edition, 1998-11-01), has been adopted withoutmodification (IDT) as CSA Standard CAN/CSA-ISO/IEC 8473-1-01, which has been approved as a NationalStandard of Canada by the Stan

2、dards Council of Canada.ISBN 1-55324-428-1 December 2001Reference numberISO/IEC 8473-1:1998(E)The Canadian Standards Association (CSA), The Standards Council of Canada is theunder whose auspices this National Standard has been coordinating body of the National Standards system, produced, was charter

3、ed in 1919 and accredited by a federation of independent, autonomousthe Standards Council of Canada to the National organizations working towards the furtherStandards system in 1973. It is a not-for-profit, development and improvement of voluntarynonstatutory, voluntary membership association standa

4、rdization in the national interest.engaged in standards development and certification The principal objects of the Council are to foster activities. and promote voluntary standardization as a means CSA standards reflect a national consensus of of advancing the national economy, benefiting theproduce

5、rs and users including manufacturers, health, safety, and welfare of the public, assisting consumers, retailers, unions and professional and protecting the consumer, facilitating domestic organizations, and governmental agencies. The and international trade, and furthering internationalstandards are

6、 used widely by industry and commerce cooperation in the field of standards.and often adopted by municipal, provincial, and A National Standard of Canada is a standard whichfederal governments in their regulations, particularly in has been approved by the Standards Council ofthe fields of health, sa

7、fety, building and construction, Canada and one which reflects a reasonableand the environment. agreement among the views of a number of capableIndividuals, companies, and associations across individuals whose collective interests provide to theCanada indicate their support for CSAs standards greate

8、st practicable extent a balance ofdevelopment by volunteering their time and skills to representation of producers, users, consumers, andCSA Committee work and supporting the Associations others with relevant interests, as may be appropriateobjectives through sustaining memberships. The more to the

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15、goods and services through the use of Ottawa, Ontario, K1P 6N7standards, certification and related services to meet Canadanational and international needs.For further information on CSA services, write toCanadian Standards Association178 Rexdale BoulevardToronto, Ontario, M9W 1R3CanadaLes normes nat

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17、adian Standards AssociationInformation technology Protocol for providing theCAN/CSA-ISO/IEC 8473-1-01 connectionless-mode network service: Protocol specificationDecember 2001 Canadian Standards Association CSA/1CAN/CSA-ISO/IEC 8473-1-01Information technology Protocolfor providing the connectionless-

18、mode network service: ProtocolspecificationCSA PrefaceStandards development within the Information Technology sector is harmonized with internationalstandards development. Through the CSA Technical Committee on Information Technology (TCIT),Canadians serve as the Canadian Advisory Committee (CAC) on

19、 ISO/IEC Joint Technical Committee 1 onInformation Technology (ISO/IEC JTC1) for the Standards Council of Canada (SCC), the ISO memberbody for Canada and sponsor of the Canadian National Committee of the IEC. Also, as a member of theInternational Telecommunication Union (ITU), Canada participates in

20、 the International Telegraph andTelephone Consultative Committee (ITU-T).This Standard supersedes CAN/CSA-ISO/IEC 8473-1-95 (adoption of ISO/IEC 8473-1:1994).This International Standard was reviewed by the CSA TCIT under the jurisdiction of the StrategicSteering Committee on Information Technology a

21、nd deemed acceptable for use in Canada. (Acommittee membership list is available on request from the CSA Project Manager.) From time to time,ISO/IEC may publish addenda, corrigenda, etc. The CSA TCIT will review these documents for approvaland publication. For a listing, refer to the CSA Information

22、 Products catalogue or CSA Info Update orcontact a CSA Sales representative. This Standard has been formally approved, without modification, bythese Committees and has been approved as a National Standard of Canada by the Standards Council ofCanada.December 2001 Canadian Standards Association 2001Al

23、l rights reserved. No part of this publication may be reproduced in any form whatsoever without the prior permissionof the publisher. ISO/IEC material is reprinted with permission. Where the words “this International Standard” appearin the text, they should be interpreted as “this National Standard

24、of Canada”. Inquiries regarding this National Standard of Canada should be addressed to Canadian Standards Association 178 Rexdale Boulevard, Toronto, Ontario, Canada M9W 1R31-800-463-6727 416-747-4044www.csa.caB CReference numberISO/IEC 8473-1:1998(E)INTERNATIONALSTANDARDISO/IEC8473-1Second edition

25、1998-11-01Information technology Protocol forproviding the connectionless-modenetwork service: Protocol specificationTechnologies de linformation Protocole assurant le service rseau enmode sans connexion: Spcification du protocoleISO/IEC 8473-1 : 1998 (E) ISO/IEC 1998All rights reserved. Unless othe

26、rwise specified, no part of this publication may be reproduced orutilized in any form or by any means, electronic or mechanical, including photocopying and micro-film, without permission in writing from the publisher.ISO/IEC Copyright Office Case postale 56 CH-1211 Genve 20 SwitzerlandiiContentsPage

27、1 Scope 12 Normative references 12.1 Identical Recommendations | International Standards . 12.2 Paired Recommendations | International Standards equivalent in technical content . 22.3 Additional references. 23 Definitions 23.1 Reference model definitions 23.2 Service conventions definitions. 33.3 Ne

28、twork layer architecture definitions. 33.4 Network layer addressing definitions 33.5 Local area network definitions 33.6 PICS definitions 33.7 Additional definitions 34 Abbreviations 44.1 Data units. 44.2 Protocol data units. 44.3 Protocol data unit fields. 44.4 Parameters . 44.5 Miscellaneous 45 Ov

29、erview of the protocol 55.1 Internal organization of the Network layer 55.2 Subsets of the protocol 55.3 Addresses and titles . 55.4 Service provided by the protocol. 65.5 Underlying service assumed by the protocol . 66 Protocol functions. 76.1 PDU composition function 76.2 PDU decomposition functio

30、n 76.3 Header format analysis function 86.4 PDU lifetime control function . 86.5 Route PDU function 86.6 Forward PDU function 96.7 Segmentation function. 96.8 Reassembly function 106.9 Discard PDU function . 106.10 Error reporting function. 116.11 PDU header error detection function. 126.12 Padding

31、function 136.13 Security function 136.14 Source routeing function . 136.15 Record route function 14ISO/IEC ISO/IEC 8473-1 : 1998 (E)iii6.16 Quality of service maintenance function 156.17 Priority function. 156.18 Congestion notification function . 156.19 Echo request function 156.20 Echo response fu

32、nction 166.21 Scope control function. 176.22 Classification of functions . 177 Structure and encoding of PDUs. 187.1 Structure 187.2 Fixed part. 197.3 Address part. 217.4 Segmentation part 227.5 Options part. 237.6 Data part 297.7 Data PDU 297.8 Inactive Network layer protocol 307.9 Error Report PDU

33、 307.10 Echo Request PDU 327.11 Echo Response PDU . 337.12 Multicast Data PDU 338 Provision of the underlying service. 338.1 Subnetwork points of attachment. 338.2 Subnetwork quality of service . 338.3 Subnetwork user data. 348.4 Subnetwork dependent convergence functions 359 Conformance. 359.1 Stat

34、ic conformance 359.2 Dynamic conformance. 379.3 PICS proforma. 37Annex A PICS proforma. 38A.1 Introduction . 38A.2 Abbreviations and special symbols 38A.3 Instructions for completing the PICS proforma. 38A.4 Identification . 40A.5 Major capabilities 41A.6 End systems. 41A.7 Intermediate systems . 47

35、Annex B Supporting technical material 52B.1 Data unit lifetime. 52B.2 Reassembly lifetime control 53B.3 The power of the header error detection function 54Annex C Algorithms for PDU header error detection function. 56C.1 Symbols used in algorithms. 56C.2 Arithmetic conventions 56C.3 Algorithm for ge

36、nerating checksum parameters 56C.4 Algorithm for checking checksum parameters. 56C.5 Algorithm to adjust the checksum parameter when an octet is altered 57ISO/IEC 8473-1 : 1998 (E)ISO/IECivForewordISO (the International Organization for Standardization) and IEC (the International Electrotechnical Co

37、mmission) formthe specialized system for worldwide standardization. National bodies that are members of ISO or IEC participate in thedevelopment of International Standards through technical committees established by the respective organization to dealwith particular fields of technical activity. ISO

38、 and IEC technical committees collaborate in fields of mutual interest.Other international organizations, governmental and non-governmental, in liaison with ISO and IEC, also take part in thework.In the field of information technology, ISO and IEC have established a joint technical committee, ISO/IE

39、C JTC 1. DraftInternational Standards adopted by the joint technical committee are circulated to national bodies for voting. Publicationas an International Standard requires approval by at least 75 % of the national bodies casting a vote.International Standard ISO/IEC 8473-1 was prepared by Joint Te

40、chnical Committee ISO/IEC JTC 1, Informationtechnology, Subcommittee SC 6, Telecommunications and information exchange between systems, in collaboration withITU-T. The identical text is published as ITU-T Recommendation X.233.This second edition cancels and replaces the first edition (ISO/IEC 8473-1

41、:1994), which has been technically revised. Italso incorporates Amendment 1:1995, Amendment 2:1996 and Amendment 3:1996.ISO/IEC 8473 consists of the following parts, under the general title Information technology Protocol for providingthe connectionless-mode network service: Part 1: Protocol specifi

42、cation Part 2: Provision of the underlying service by an ISO/IEC 8802 subnetwork Part 3: Provision of the underlying service by an X.25 subnetwork Part 4: Provision of the underlying service by a subnetwork that provides the OSI data link service Part 5: Provision of the underlying service by ISDN c

43、ircuit-switched B-channels Part 6: Provision of the underlying service assumed by ISO/IEC 8473 by subnetworks employing ISO/IEC 10028CONS relay Part 7: Provision of the underlying service assumed by ISO/IEC 8473 by frame relay subnetworksAnnex A forms an integral part of this part of ISO/IEC 8473. A

44、nnexes B and C are for information only.ISO/IEC ISO/IEC 8473-1 : 1998 (E)vIntroductionThis is one of a set of Recommendations and International Standards produced to facilitate the interconnection of opensystems. The set covers the services and protocols required to achieve such interconnection.This

45、 Recommendation | International Standard is positioned with respect to other related Recommendations andInternational Standards by the layers defined in ITU-T Rec. X.200 | ISO/IEC 7498-1. In particular, it is a protocol of theNetwork layer. The protocol specified by this Recommendation | Internation

46、al Standard may be used between Networkentities in end systems, between Network entities in intermediate systems, or between a Network entity in an end systemand a Network entity in an intermediate system. In an end system, it provides the connectionless-mode Network servicedefined in ITU-T Rec. X.2

47、13 | ISO/IEC 8348.The interrelationship of the protocol specification and the related service definitions is illustrated in Figure Intro.1.T0718880-93/d01OSI Network serviceProtocolspecificationUnderlying serviceReference to aimsReference to assumptionsFigure Intro. 1 Interrelationship of protocol a

48、nd servicesFIGURE 1/X.233.D01 = 4 CMIn order to evaluate the conformance of a particular implementation of this protocol, it is necessary to have a statement ofwhich of the protocols capabilities and options have been implemented. Such a statement is called a ProtocolImplementation Conformance State

49、ment (PICS), as defined in ITU-T Rec. X.296 | ISO/IEC 9646-7. A PICS proforma,from which a PICS may be prepared for a specific implementation, is included in this Recommendation | InternationalStandard as normative Annex A.ISO/IEC 8473-1 : 1998 (E)ITU-T Rec. X.233 (1997 E) 1INTERNATIONAL STANDARDISO/IEC 8473-1 : 1998 (E)ITU-T Rec. X.233 (1997 E)ITU-T RECOMMENDATIONINFORMATION TECHNOLOGY PROTOCOL FOR PROVIDINGTHE CONNECTIONLESS-MODE NETWORK SERVICE:PROTOCOL SPECIFICATION1 ScopeThis Recommendation | International Standard specifies