ITU-T X 263-1998 Information Technology - Protocol Identification in the Network Layer - Series X Data Networks and Open System Communications Open Systems Interconnection - Protoc.pdf

1、INTERNATIONAL TELECOMMUNICATION UNION ITU-T TELECOMMUNICATION STANDARDIZATION SECTOR OF ITU X.263 (09/98) SERIES X: DATA NETWORKS AND OPEN SYSTEM COMMUNICATIONS Open Systems Interconnection - Protocol Identification Information technology - Protocol identification in the Network Layer ITU-T Recommen

2、dation X.263 (Previously CCIlT Recommendation) STD-ITU-T RECMN X.Zb3-ENGL 1998 48b2571 Oh60822 764 m ITU-T X-SERIES RECOMMENDATIONS DATA NETWORKS AND OPEN SYSTEM COMMUNICATIONS UBLIC DATA NETWORKS Services and facilities Interfaces Transmission, signalling and switching Network aspects Maintenance A

3、dministrative arrangements )PEN SYSTEMS INTERCONNECTION Model and notation Service definitions Connection-mode protocol specifications Connectionless-mode protocol specifications x. l-x. 19 X.20-X.49 X.50-X.89 X.90-X.149 X. 150-X. 179 X. 1 80-X. 199 X.200-X.209 X.210-X.219 X.220-X.229 X.230-X.239 PI

4、CS Drofoxmas X.240-X.259 and b) It pennits an entity to discriminate among a number of different protocols (both OS1 and non-OSI) that might co-exist in a common environment. This Recommendation I Technical Report contains a description of the means used to identify protocols and where that informat

5、ion is located in a protocol, together with a record of those values of protocol identifiers which have been used by ITU-T and ISO/IEC, and by other authorities. This Recommendation I Technical Report does not attempt to provide any general architectural principles for the functions of protocol iden

6、tification, nor does it attempt to provide judgements as to whether a protocol might have more than one value of protocol identifier. By reference to this Recommendation I Technical Report, future protocols can be developed to include a protocol identifier and the values of such protocol identifiers

7、 can be chosen on a knowledgeable basis. iv ITU-T Rec X.263 (1998 E) STD-ITU-T RECMN X-2b3-ENGL 1998 4862571 ObbOCJ27 246 W ISOAEC TR 9577 : 1999 (E) TECHNICAL REPORT ITU-T RECOMMENDATION INFORMATION TECHNOLOGY - PROTOCOL IDENTIFICATION IN THE NETWORK LAYER 1 Scope This Recommendation I Technical Re

8、port provides: a) the description of a means to permit a protocol to be identified; b) a record of the structure and allowable ranges of protocol identifer(s) which can be assigned by ITU-T, ISO/IEC and other authorities; c) a record of the values of protocol identifiers used by OS1 Network layer pr

9、otocols and non-OS1 protocols occupying a similar position: in particular, protocols with protocol control information commencing in octet 1 of the protocol data unit (header-oriented protocols), and protocols with protocol control information commencing in the final octet of the protocol data unit

10、(trailer-oriented protocols), are covered; and d) a record of the values that are in use as protocol control information in non-Network layer protocols where they impact on Network layer protocol identification. The application of this Recommendation I Technical Report is: a) in the identification o

11、f internationally standardized Network layer protocols operating directly above the Data Link service; b) in the identification of protocols used in conjunction with internationally standardized Network layer protocols that operate directly above the Data Link service; and to distinguish between Int

12、ernationally standardized Network layer protocols, and other internationally standardized protocols used in conjunction with internationally standardized Network layer protocols. c) This Recommendation I Technical Report is for use by ITU-T Study Groups, LSOAEC Technical Committees and other authori

13、ties in applying the principles contained in clause 4, and in selecting an unused value or values from the range of brought to the attention of IT-T Study Group 7 or ISOLEC JTC 1 SC6 so that this Recommendation I Technical Report can be amended. I values permitted in clauses 5 or 6, as appropriate.

14、When a new value is selected, that value and its usage should be 2 References The following Recommendations and International Standards contain provisions which, through reference in this text, constitute provisions of this Recommendation I Technical Report. At the time of publication, the editions

15、indicated were valid. All Recommendations and Standards are subject to revision, and parties to agreements based on this Recommendation I Technical Report are encouraged to investigate the possibility of applying the most recent edition of the Recommendations and Standards listed below. Members of I

16、EC and IS0 maintain registers of currently valid International Standards. The Telecommunication Standardization Bureau of the IT maintains a list of currently valid IT-T Recommendations. ITU-T Rec. X.263 (1998 E) 1 STD-ITU-T RECMN X.263-ENGL 1998 4862591 0660826 182 ISO/IEC TR 9577 : 1999 (E) 2.1 Id

17、entical Recommendations I International Standards - IT-T Recommendation X.200 (1994) I ISO/IEC 7498-1: 1994, Information technology - Open Systems Interconnection - Basic Reference hodl: The-Basic Model. - ITU-T Recommendation X.224 (1995) I ISOAEC 8073:1997, Information technology - Open Systems In

18、terconnection - Protocol for providing the connection-mode transport service. - ITU-T Recommendation X.233 (1993) I ISO/IEC 8473-1:1994, Information technology - Protocol for providing the connectionless-mode network service: Protocol specification. - -T Recommendation X.260 (1996) I ISO/IEC 14765:1

19、997, Information technology - Framework for protocol identification and encapsulation. - ITU-T Recommendation X.273 (1994) I ISOAEC 11577:1995, Information technology - Open Systems Interconnection - Network layer security protocol. - ITU-T Recommendation X.633 (1996) I ISO/IEC 14700: 1997, Informat

20、ion technology - Open Systems Interconnection - Nework Fast Byte Protocol. - -T Recommendation X.634 (1996) I ISO/IEC 14699:1997, Information technology - Open Systems Interconnection - Transport Fast Byte Protocol. 2.2 Paired Recommendations I International Standards equivalent in technical content

21、 - ITU-T Recommendation X.223 (1993), Use of X.25 to provide the OS1 connection-mode network service for ITU-T applications. ISO/IEC 8878: 1992, Information technology - Telecommunications and information exchange between systems - Use of X.25 to provide the OS1 Connection-mode Network Service. - -T

22、 Recommendation X.264 (1993), Transport protocol identification mechanism. ISO/IEC 1 1570: 1992, Information technology - Telecommunications and information exchange between systems - Open Systems Interconnection - Transport protocol identification mechanism. 2.3 Additional references - CCITT Recomm

23、endation G.764 (1990), Voice packetization - Packetized voice protocols. - ITU-T Recommendation 1.365.2 (1993, B-ISDN ATM adaptation layer sublayers: Service specific coordination function to provide the connection-oriented network service. - ITU-T Recommendation 1.365.3 (1995), B-ZSDN ATM adaptatio

24、n layq- sublayers: Service specific coordination function to provide the connection-oriented transport service. - ITU-T Recommendation 4.931 (1993), ISDN user-network interface layer 3 speci$cation for basic call control. - ITU-T Recommendation Q.932 (1993), Generic procedures for the control of ISD

25、N supplementary services. - ITU-T Recommendation 4.933 (1995), Signalling specifications for frame mode switched and permanent virtual connection control and status monotonng. - ITU-T Recommendation 4.21 19 (1996), B-ISDN ATM adaptation layer - Convergence function for SSCOP above the frame relay co

26、re service. 2 ITU-T Rec. X.263 (1998 E) STD-ITU-T RECMN XmZb3-ENGL 3998 Y8b2591 ObbO829 O19 ISO/IEC TR 9577 : 1999 (E) IT-T Recommendation Q.2931 (1993, Digital Subscriber Signalling System No. 2 - User-Network Intelface (UNI layer 3 specification for basic calllconnection control. IT-T Recommendati

27、on T.70 (1 993), Network-independent basic transport service for the telematic services. -T Recommendation X.25 (1996), Interface between Data Terminal Equipment (DTE and Data Circuit-terminating Equipment (DCE for terminals operating in the packet mode and connected to public data networks by dedic

28、ated circuit. -T Recommendation X.29 (1993), Procedures for the exchange of control information and user data between a Packet AssemblyDisassembly (PAD facility and a packet mode DTE or another PAD. ITU-T Recommendation X.36 (1993, Interface between Data Terminal Equipment (DTE) and Data Circuit-ter

29、minating Equipment (DCE for public data networks providing frame relay data transmission service by dedicated circuit. ITU-T Recommendation X.37 (1993, Encapsulation in X.25 packets of various protocols including frame relay. ITU-T Recommendation X.39 (1996), Procedures for the exchange of control i

30、nformation and user data between a Facsimile Packet AssemblyDisassembly (FPAD faciliry and a packet mode Data Terminal Equipment (DTE or another FPAD. IT-T Recommendation X.45 (1996), Interface between Data Terminal Equipment (DTE and Data Circuit-terminating Equipment (DCE) for terminals operating

31、in the packet mode and connected to public data networks, designed for efficiency at higher speeds. ITU-T Recommendation X.48 (1996), Procedures for the provision of a basic multicast service for Data Terminal Equipments (DTEs using Recommendation X.25. ITU-T Recommendation X.49 (1996), Procedures f

32、or the provision of an extended multicast service for Data Terminal Equipments (DTEs using Recommendation X.25. CCITT Recommendation X.610 (1992), Provision and support of the OSI connection-mode network service. ISOAEC 8208: 1995, Information technology - Data communications - X.25 Packet Layer Pro

33、tocol for Data Terminal Equipment. ISOAEC 8802 (All parts), Information technology - Telecommunications and information exchange between systems - Local and metropolitan area networks. IS0 9542: 1988), Information processing systems - Telecommunications and information exchange between systems - End

34、 system to Intermediate system routeing exchange protocol for use in conjunction with the Protocol for providing the connectionless-mode network service (IS0 8473). ISO/IEC 10030: 1995, Information technology - Telecommunications and information exchange between systems - End System Routeing Informa

35、tion Exchange Protocol for use in conjunction with ISO/IEC 8878. ISO/IEC 16589: 1992, Information technology - Telecommunications and information exchange between systems - Intermediate system to Intermediate system intra-domain routeing information exchange protocol for use in eonjunction with the

36、protocol for providing the connectionless-mode Network Service (IS0 8473). ISO/IEC 10747: 1994, Information technology - Telecommunications and information exchange between systems - Protocol for exchange of inter-domain routeing information among intermediate systems to ISOIIEC 1 1572: 1997, Inform

37、ation technology - Telecommunications and information exchange between systems - Private Integrated Services Network - Circuit mode bearer services - Inter-exchange signalling procedures and protocol. ISOAEC 1 1582: 1995, Information technology - Telecommunications and information exchange between s

38、ystems - Private Integrated Services Network - Generic functional protocol for the support of supplementary services - Inter-exchange signalling procedures and protocol. support forwarding of IS0 8473 PDUs. -. ) Currently under revision. ITU-T Rec. X.263 (1998 E) 3 STDmITU-T RECMN X.Zb3-ENGL 3998 48

39、62543 ObbO930*830 ISODEC TR 9577 : 1999 (E) - ISOAEC TR 13532: 1995, Information technology - Telecommunications and information exchange between systems - Protocol combinations to provide and support the OS1 Network Service. - RFC 791, Internet Protocol. J. Pode1 (September 1981). - RFC 1548, The P

40、oint-to-Point Protocol (PPP). W. Simpson (December 1993). - RFC 2460, Internet Protocol, Version 6 (IPv6) Specijication (December 1998). - FRF.9 (Frame Relay Forum), Data Compression over Frame Relay Implementation Agreement (January 1996). - FRF. 12 (Frame Relay Forum), Fragmentation over Frame Rel

41、ay Implementation Agreement mecember 1997). - FRF.priv (Frame Relay Forum), Frame Relay Privacy Implementation Agreement. - FRF.OA this is depicted in Figure 1. The value of the PI unambiguously identifies the initial protocol within the set of header-oriented protocols. Data Link service data unit

42、Octet 1 Network layer protocol control information Location of the IPI Figure 1 - Location of the IPI The location of the IPI for a trailer-oriented protocol is the final octet of the protocol control information; this is depicted in Figure 2. The value of the IPI unambiguously identifies the initia

43、l protocol within the set of trailer-oriented protocols. It is not possible in general to mix header-oriented and trailer-oriented protocols on the same data link: a priori knowledge is needed of the nature of the protocols to be received at a particular Data Link service access point. Data Link ser

44、vice data unit .K Gx - - - - - - - - - Last octet Network layer protocol control infomation Location of the IPI Figure 2 - Location of the IPI for trailer-oriented protocols ITU-T Rec. X.263 (1998 E) 5 STD=ITU-T RECMN X.263-ENGL 1998 4862591 0660832 603 m ISO/IEC TR 9577 : 1999 (E) 5.2 Assignment st

45、ructure for header-oriented protocols The structure applied to the values of the WI for header-oriented protocols is depicted in Table 1. With the exception of protocol identifiers used by IT-T Rec. X.25 and ISOEC 8208, bits 8, 7, 6, and 5 of the IPI indicate the administrative authority which is re

46、sponsible for assigning a combination of the associated bits 4, 3,2 and 1 to an initial protocol. Table 1 - Structure of the PI octet for header-oriented protocols Bit pattern 87654321 O O 000000 000000 through to and including 000111 XOlXXX XlOXXX Ollxxx 1oooox 100010 100010 through to and includin

47、g 100111 lllxxx oooxxx Ollxxx 1 o o x x-x 111000 through to and including 111111 11 11 1.1 O 1 c 1 Allocation category Allocation by ISOAEC Allocation by IT-T ITU-T Rec. X.25 and ISOIIEC 8208 IT-T Rec. X.25 and ISOIIEC 8208 IT-T Rec. X.25 and ISO/IEC 8208 Allocation by ISOAEC Allocation by IT-T Allo

48、cation by ISOflEC Joint allocation by IT-T and ISOIIEC Allocation by ISOAEC Allocation by ITU-T Not categorized by this Recommendation I Technical Report (Note) Joint Allocation by ITU-T and ISOIIEC Reserved for extension, see Table 2 - - NOTE - Although not categorized by this Recommendation I Tech

49、nical Report, the codepoints 1 100 1 100 and 1 100 11 11 are in widespread use (see Table 2 and Annex C). 5.3 Values assigned to the PI for header-oriented protocols Table 2 records the values that have been assigned to specific protocols. Values not recorded are reserved and available for allocation by the administrative authorities specified by the structure depicted in 5.2. I A specific value is reserved to indicate the null Network layer. One value is reserved for future extension to this Recommendation I Technical Report. 6