信息技术 系统间远程通信和信息交换 网络层中间系统中继功能的定义

[中文适用范围]： 旨在用于指导支持 OSI 网络服务的实际互通单元和实际子网（例如局域网和专用分组交换网络）的设计和应用。 作为表达该定义的主要手段，使用网络内层服务的概念。 该定义包括调用网络路由功能作为网络中继功能的必要元素。 网络中继功能的定义既适用于支持网络服务所有元素的子网，也适用于互连两个子网的网络中继系统。 [外文原描述]： Is intended for use in guiding the design and application of real interworking units and real subnetworks (e.g. local area networks and private packet switched networks) which are to support the OSI network service. As the principal means for expressing the definition, the concept of the network internal layer service is used. The definition includes the invocation of network routing functions as a necessary element of the network relaying functions. The definition of network relaying functions applies both to a subnetwork supporting all elements of the network service and to a network relay system interconnecting two subnetworks.