1、I NTERNATIONAL STANDARD ISOJIEC 10030 Second edition 1995-04-1 5 Information technology - Tel eco m mu n kat io ns and inform at i o n exchange between systems - End System Routeing Information Exchange Protocol for use in conjunction with 1SO/IEC 8878 Technoiogies de 1 information - Teiecornmunicat
2、ions et echange din formation entre sysfemes - Prutocoie dechange dinformatm pour le routage dun systeme dextremite a utiliser conjointement avec IISO/CEI 8878 National Stand a rd of Canada CA N/CSA -ISO/IEC-lOO30-96 International Standard ISO/IEC 10030:1995 has been adopted, without modification, a
3、s CAN/CSA-ISO/IEC-10030-96, which has been approved as a National Standard of Canada by the Standards Council of Canada. This new edition replaces CANJ/CSA- 2243.137-92 (adopted ISO/IEC 10030:1990). December 1996 ISSN 031 7-5669 Reference number ISO/IEC 10030:1995(E) ISO/IEC 10030:1995(E) Contents 1
4、 2 3 4 5 6 7 8 9 10 11 12 Scope Normative references Def i nitio n s . Abbreviations Overview of the Protocol . Conformance SNARE Subnetwork Address . Configuration I nf ormat io n Subset . System Redirection Information Subset Address and SNPA Masks SNARE Procedures Structure and Encoding of PDUs A
5、nnex A Annex 8 Annex C Page 1 1 2 3 3 5 5 5 9 11 11 13 19 21 32 C IS3/1EC 1995 All rights reserved Unless otherwise specified. no part of this publication may be reproduced or utilized in any form 07 by any means . electronic or mechanical. including photocopying and microfilm without permission in
6、writing from ;he publisher IS3/1EC Copyrigit Office Case Postale 56 CH-1211 Geneve 20 Switzerland o ISO/IEC ISO/IEC 10030: 1995( E) Foreword IS0 (the International Organization for Standardization) and IEC (the inter- national Electrotechnical Commission) form the specialized system for worldwide st
7、andardization. National bodies that are members of IS0 or IEC participate in the development of International Standards through technical committees established by the respective organization to deal with particular fields of technical activity. IS0 and IEC technical corn- mittees collaborate in fie
8、lds of mutual interest. Other international organ- izations, governmental and non-governmental, in liaison with IS0 and IEC, also take part in the work. In the field of information technology, IS0 and IEC have established a joint technical committee, ISO/IEC JTC 1. Draft International Standards adop
9、ted by the joint technical committee are circulated to national bodies for vot- ing. Publication as an International Standard requires approval by at least 75% of the national bodies casting a vote. International Standard ISO/IEC 10030 was prepared by Joint Technical Committee ISO/IEC JTC 1, Informa
10、tion technology, Subcommittee SC 6, Telecommunications and information exchange between systems. This second edition cancels and replaces the first edition (IS0 10030:1990), which has been technically revised. It is a consolidation of Amendments 2 and 3 as well as Technical Corrigenda 1 and 2. Annex
11、es A and B form an integral part of this International Standard. An- nex C is for information only. iii ISO/IEC 10030: 1995( E) Introduction o ISO/IEC This International Standard is one of a number of standards concerned with Network Layer Routsing Protocols. An overall framework for routeing is des
12、cribed in ISO/IEC TR 9575. This International Standard specifically relates to that part of the framework which deals with Single Subnetwork Routeing. This International Standard is related to ISOAEC 8878 which specifies the use of X.25 to provide the IS0 connection-mode Network Service. This Protoc
13、ol provides solutions for the following practical problems: a) How do End Systems discover the reachability of Intermediate Systems that can route NPDUs to destinations on subnetworks other than the one(s) to which the End System is directly connected? b) How do End Systems discover the reachability
14、 of other End Systems on the same subnetwork (when direct examination of the destination NSAP address does not provide information about the destination subnetwork address)? c) How does a Subnetwork Address Resolution Entity discover the reachability of End Systems on the subnetwork to which it is d
15、irectly connected? d) How does an end System, which has not been preconfigured with its own Network Address, request the temporary assignment of a Network Entity Title (NET) and thus, derive the necessary Network Address(es), from a SNARE located on a mmmon subnetwork? e) How do Intermediate systems
16、 discover the reachability of End Systems on the same subnetwork (when direct examination of the NSAP destinafion address does not provide information about the destination subnetwork address)? The Protocol assumes that: a) Routeing to a specified subnetwork point of attachment (SNPA) address on the
17、 same subnetwork is carried out satisfactorily by the subnetwork itSGtf. b) The subnetwork is not, however, capable of routeing on a global basis using the NSAP address alone to achieve communication with a requested destination. c) End Systems and Intermediate Systems using this protocol require to
18、 know at least one SNPA address that can be used to access a SNARE. The protocol is designed to: a) minimize the amount of a priori state information needed by End Systems before they can begin to communicate with other End Systems; iv 0 ISO/IEC ISO/IEC 10030:1995(E) b) minimize the amount of memory
19、 needed to store routeing information in End Systems; and c) minimize the computational complexity of End Systems routeing algorithms. This Protocol performs similar functions to the ones specified in IS0 9542. However, the characteristics of environments operating ISO/IEC 8208 (X.25/PLP) and the ac
20、tual functionality of ISOAEC 8208 (X.25PLP) in itself invalidate the operation of IS0 9542 as follows: a) In general non-broadcast environments, the Configuration subset of IS0 9542 is inadequate. b) In broadcast environments operating ISOAEC 8208 (X.25/PLP), the Redirection subset of IS0 9542 is in
21、validated. Therefore, this Protocol is developed to perform all the aforementioned functions in harmony with the operation of ISOAEC 8208 (X.25IPLP). V INTERNATlONAL STANDARD ISO/IEC 10030:1995(E) nformation technology - Telecommunications and nformation exchange between systems - End System qoutein
22、g Information Exchange Protocol for use in :onjunction with ISO/IEC 8878 1 Scope This International Standard defines a protocol for the exchange of routeing information between an End System and a Subnetwork Address Resolution Entity, and between an Intermediate System and a Subnetwork Address Resol
23、ution Entity. This International Standard is applicable to: a) End Systems which operate according to the main body of ISOAEC 8878 to provide and support !he OS1 Connection-mode Network Service using ISO/IEC 8208. b) Subnetwork Address Resolution Entities which operate ISO/IEC 8208. NOTE - The Subne
24、twork Address Resolution Entity defined in this International Standard may be associated with relay functions as defined in ISOAEC 10028 and ISOA EC 101 77. c) Intermediate systems which ISO/IEC 8208. operate End Systems which provide and support the OS1 CONS using the fast select 1980 procedures or
25、 the alternative 1980 procedures in annex A of ISOAEC 8878 are outside the scope of this International Standard. This International Standard does not specify any protocol elements nor algorithms for facilitating routeing and relaying among SNARES. Such functions are intentionally outside the scope o
26、f this International Standard. To evaluate conformance of a particular implementation, it is necessary ta have a statement of which capabilities and options have been implemented. Such a statement is called Protocol Implementation Conformance Statement (PICS), as defined in ISO/IEC 9646-1. This Inte
27、rnational Standard provides the PlCS proforma in compliance with the relevant requirements, and in accordance with the relevant guidance, given in IS0 9646-7. 2 Normative references The fallowing standards contain provisions which, through reference in the text, constitute provisions of this Interna
28、tional Standard. At the time of publication, the editions indicated were valid. All standards are subject to revision, and parties to agreements based on this International Standard are encouraged to investigate the possibility of applying the most recent editions of the standards indicated below. M
29、embers of IEC and IS0 maintain registers of currently valid International Standards. ISO/IEC 7498-1 : 1994, information technology - Open Systems Interconnection - Basic Reference Model - Pad I: The Basic Model. ISO/IEC 8208 : 1990, lnformation technobgy - Data communications - X.25 Packet Layer Pro
30、tocol for Data Terminal Equipment. ISO/IEC 8208 : 199O/Amd. 3 : 1991 lnformatbn technology - Data communications - X.25 Packet Layer Protocol for Data Terminal Equbment - Amendment 3: Conformance requirements. ISO/IEC 8348 : 1993, lnformation technology - Open Systems lnferconnection - Network Servi
31、ce Definition. IS0 8648 : 1988, Information processing systems - Open Systems Interconnection - lntsrnal organization of the Network Layer. 1 ISO/iEC 10030:1995( E) 0 ISO/IEC IS0 8802-2 : 1989, Information processing systems - Local area networks - Part 2: bgkal link control. ISOAEC 8878 : 1992, Inf
32、ormation technology - Telecommunkatbns and inforrnatbn exchange between systems - Use of X.25 to provide the OS1 Connectbn-mode Network Service. ISOIIEC 8880-1 : 1990, Information technology - Telecommunications and information exchange between systems - Protocol combinations to provide and support
33、the OS1 Network Service - Part I: General princifles. ISOAEC 8880-2 : 1992, Information technology - Telecommunications and information exchange between systems - Protocol combinations to provr;de and support the US/ Nefwork Service - Part 2: Provision and support of the connection-mode Network SeMi
34、Zt3. ISOAEC 8881 : 1989, lnformation processing systems - Data communications - Use of the X.25 packet level protocol in local area networks. ISOAEC 8886 : 1992, Information technology - Teiecomrnunicatbns and information exchange between systems - Data link service definition fur en Systems Interco
35、nnection. IS0 9542 : 1988, lnformafbn processing systems - Telecommunications and information exchange between systems - End system tu Intermediate system routeing exchange protocol fur use in conjunction with the Prutocul for providing the wnnecfkanless-mode network service (IS0 8473). ISOAEC TR 95
36、75 : 1990, lnformatbn technology - Telecommunications and information exchange between systems - OS1 Routeing Framework. ISO/IEC lR 9577 : 1993, Information technology - Telecvrnmunications and information exchange between systems - Protocol identification in the network layer- ISO/IEC 9646-1 : 1994
37、, Information technology - Opsn Systems Interaonnectiun - Conformance testing methodology and framework - Part I: General CUnCePtS. ISOIIEC 9646-7 : +-I, lnfurmatiun technology - Open Systems Interconnection - Conformance testing methodology and framework - Part 7: Implementatiun confumance statemen
38、ts. ISOIIEC 10028 : 1993, Information technology - Telecommunicatbns and information exchange between systems - Definitrbn of the relaying functbns of a Network layer intermediate system. ISOAEC 10039 : 1991. lnformation technology - Open Systems Interconnection - Local area networks - Medium Aocess
39、 Controi (MAC) senke definition. ISOAEC 10177 : 1993, hformation technology - Telecommunications and information exchange between systems - Provision of the connection-mode Network internal layer service by intermediate systems using ISO/IEC 8208, the X.25 Packet Layer Protocol. ISOAEC TR 10178 : 19
40、92, Information technology - Telecommunications and infomatbn exchange between sysfems - The structure and coding of Logical Link Control addresses in Local Area Networks. 3 Definitions 3.1 Reference Model Definitions This International Standard makes use of the following terms defined in ISOAEC 749
41、8-1 : a) Network Layer b) Network Service Access Point c) Network Service Access Point address d) Network Entity e) Routeing f) Network Protocol g) Network Relay h) Network Protocol Data Unit 3.2 Network Layer Architecture Definitions This International Standard makes use of the following terms defi
42、ned in IS0 8648: a) Subnetwork b) End System c) Intermediate System d) Subnetwork Service e) Subnetwork Access Protocol 3.3 Network Layer Addressing Definitions This International Standard makes use of the following terms defined in ISOAEC 8348: a) Network Entity Titles b) Subnetwork address c) Subn
43、etwork Point of Attachment 3.4 Local Area Network Definitions This international Standard makes use of the following terms defined in IS0 8802-2: a) Multicast address b) Broadcast address 3.5 Additional Definitions For the purposes of the International Standard, the following definitions appiy: 3.5.
44、1 configuration information: Information about the collection of End Systems and Intermediate Systems attached to a subnetwork defined in 1. To be published. 2 o ISO/IEC ISO/IEC 10030: 1995(E) terms of the system types, Network Addresses present, Network Entity Titles present, and the correspondence
45、 between systems, SNPA addresses, and potential routss. 3.5.2 redirection Information: Information supplied when a Call Request fails to achieve establishment of a Network Connection, indicating an SNPA which could be used to establish such a connection. 3.5.3 subnetwork address resolution entity: S
46、upplier of information concerning routeing within a single subnetwork. 3.6 PlCS Definttions This International Standard makes use of the following terms defined in ISOAEC 9646-7. a) Protocol Implementation Conformance Statement b) PlCS proforma (PICS) 4 Ab breviatlons 4.1 Systems DTE Data Terminal E
47、quipment ES End System IS Intermediate System SNARE Subnetwork Address Resolution Entity 4.2 Protocol Data Units ECQ PDU ENC PDU ERA PDU ESC PDU ESH PDU RD PDU SAA PDU SCC PDU SCR PDU SHL PDU SNC PDU SRH PDU SRN PDU End/lnterrnediate System Configuration Query Protocol Data Unit Endhtermediate Syste
48、m Notification Complete Protocol Data Unit End System Request Address Protocol Data Unit EndAntermediate System Connect Protocol Data Unit Endhtermediate System Hello Protocol Data Unit Redirect Protocol Data Unit SNARE Assign Address Protocol Data Unit SNARE Cor.!iguration Complete Protocol Data Un
49、it SNARE Configuration Response Protocol Data Unit SNARE Hello Protocol Data Unit SNARE Notification Complete Protocol Data Unit SNARE Request Hello Protocol Data Unit SNARE Received Notification Protocot Data Unit NOTE - The name of the PDU should not be construed as implying a definition of the PDUs function. For example an ECQ PDU can be transmitted by an IS. 4.3 Miscellaneous BCD Binary Coded Decimal LLC Logical Link Control MAC Medium Access Control NA Network Address NPDU Network Protocol Data Unit QOS Quality of Service SNPA Subnetwork Point of Attachment 5 Overview of the Pr
