Research On Software Design And Extension Of Internet Routing Protocols IS-IS

When it comes to the 90's of the twentieth century, by the development of computer technology and communication technology, the computer network goes through a great transform that has never happened. The network undergoes a far advancement in the scale, performance and service. But at the same time, the user's demand on the network grows even faster, which puts more and more pressure upon the network. The requirement on routers, the core device of network, is continuously developing.The function of router is to send the packets exactly from the source host to the destination host with the methods such as flow classification, congestion control and so on to keep the transmission fast and efficient. In this process the routing protocols play an important role. Due to distributed characteristics of routing protocols, their structure is much more complex than the traditional end-to-end protocols. The thesis analyzes the characteristics in function and structure of IS-IS. We present a software architecture based on the implicit invocation, suitable for the implementation of the routing protocols. The structure and the scheme of the IS-IS implementation are given based on the architecture.With the development of CNGI project as IPv6 backbones come forth. and there are no suitable transition mechanisms available to satisfy this demand of complex routing and packets propagation at present. We not only propose a kind of mechanism which is a kind of automatic-tunnel mechanism orient to routing protocols but work out a design of an extension for IS-IS protocol Finally according to the extension mechanism, this paper discusses topics of future works and summaries the analysis and design of IS-IS protocol.