信息技术.网络层中协议标识

[中文适用范围]： 此建议|技术报告提供： a) 允许识别协议的方法的描述； b) 可由 ITU-T、ISO/IEC 和其他机构分配的协议标识符的结构和允许范围的记录； c) OSI网络层协议和占据相似位置的非OSI协议使用的协议标识符值的记录：特别是具有从协议数据单元的八位字节1开始的协议控制信息的协议（面向报头的协议），涵盖了从协议数据单元的最后八位字节开始的协议控制信息的协议（面向尾部的协议）； d) 在非网络层协议中用作协议控制信息的值的记录，这些值影响网络层协议的识别。 本建议书的应用|技术报告是： a) 直接在数据链路服务之上运行的国际标准化网络层协议的标识； b) 识别与直接在数据链路服务之上运行的国际标准化网络层协议结合使用的协议； c) 区分国际标准化网络层协议和与国际标准化网络层协议结合使用的其他国际标准化协议。 此建议|技术报告供 ITU-T 研究组、ISO/IEC 技术委员会和其他机构在应用第 4 条中包含的原则时使用，并从第 5 条或第 6 条允许的值范围中选择一个或多个未使用的值，如合适的。 当选择新值时，应提请 ITU-T 第 7 研究组或 ISO/IEC JTC 1 SC6 注意该值及其用途，以便本建议书 |技术报告可以修改。 [外文原描述]： This Recommendation | Technical Report 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 identifier(s) which can be assigned by ITU-T, ISO/IEC and other authorities; c) a record of the values of protocol identifiers used by OSI Network layer protocols and non-OSI 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 (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 | Technical Report is: a) in the identification of 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 c) to distinguish between Internationally standardized Network layer protocols, and other internationally standardized protocols used in conjunction with internationally standardized Network layer protocols. This Recommendation | Technical Report is for use by ITU-T Study Groups, ISO/IEC Technical Committees and other authorities in applying the principles contained in clause 4, and in selecting an unused value or values from the range of values permitted in clauses 5 or 6, as appropriate. When a new value is selected, that value and its usage should be brought to the attention of ITU-T Study Group 7 or ISO/IEC JTC 1 SC6 so that this Recommendation | Technical Report can be amended.