Research And Implementation Of Automatic Generation Of Configuration Information Of IPv6Based Campus Network

Network management system is an indispensable facility of moderncomplex network infrastructure, and configuration management as one of thefive management function areas is the foundation component of networkmanagement. Currently, configuration management is mostly achieved manuallyby network operators through command line interface (CLI), due to thecomplexity of network, the diversity of functions and services supported bynetwork devices, as well as the complex dependencies among functions andservices，the mis-configuration happens frequently. The mis-configuration maylead to network failures, or even lead to security holes. These security holesmay exist for a long time, and become the hidden trouble of network operation.With the adoption of IPv6protocol, the campus network requires a lot ofupgrade operations for devices and significant human involvement forconfiguration. Due to the complexity of IPv6protocol, network managers needto learn many new configuration commands. On the other hand, to leverage thesecurity of IPv6protocol, new security improvements, such as SAVI, areinstrumented to the campus network devices, which further add complexity toconfiguration tasks. The configuration method at such a low and manual levelinevitably leads to more network failures and more serious security problems.In the thesis, we first summarize the design principles of automaticconfiguration system for campus network based on the survey of networkautomatic configuration domain. Based on the principles, we propose thearchitecture of an automatic configuration system for campus network. Then westudy on the automatic configuration strategy about SAVI switch network,dynamic configuration method about VLAN, and adaptive tuning of operationparameters for automatically learned filter table respectively. We use alloylanguage to realize the formal description about the configuration strategy ofSAVI switch network, and use a general rule resolver to find a configuration solution intelligently. The unambiguous feature of the configuration descriptionusing alloy can avoid the mis-understanding of network administrators onconfiguration rules, which lays the foundation of the automatic resolution of theconfiguration rules. With the continuous richness of the configuration rule base,the functionalities of the automatic configuration system will be enhancedcontinuously. Our dynamic configuration method about VLAN applies thebroadcast cost model to divide the network users into different VLANs. Themethod has a good adaptability against the network failure and the change of themanagement strategy, and can reduce the management load of switchessignificantly. So the method can overcome some weakness when enabling STPprotocol under multi-VLAN situation. Through the study on the adaptive tuningof lifetime parameters for the filter table of the SAVI switch, we propose adynamic configuration algorithm to reduce the duplicate confirmation times foritems in the filter table as soon as possible to reduce the management overheadof the SAVI switch, while ensure that the filter table is not full at any time.Through this method, we demonstrate the importance of the combination ofnetwork configuration and monitoring, and validate the effectiveness ofdynamic adjustment method based on feedback mechanism.