Researches On Management Information Model, SMI And MIB In Network Management

A network management system has four main components: management application, management architecture, management information base, and the protocols delivering the management information. MIBs are specifications containing definitions of management information so that the network can be remotely monitored, configured, and controlled. Moreover, to guarantee our military communication network free from being subject to other countries and being destroyed by the enemy, it is very important to develop our network management platform. In this dissertation, an implementation of TMN-MIB translator and a constructing method to store TMN-MIB are presented firstly. Then, a proxy technique for the interworking between CMIP and SNMP is given. Finally, the dissertation discusses the application of CORBA technology in TMN framework and the algorithm, which is used to map the information defined by ASN.l/GDMO into those defined by IDL. The main work and innovation points of this dissertation include:1. A TMN-MIB translator, i.e., a method of translating the MIB structures into C++ codes is designed and implemented. In the method, The Contain Class used to describe the complex data types is firstly defined, then the various types of ASN.l and templates of GDMO are realized, consequently, the procedure of MIB compiler processes ASN.l modules and GDMO modules is described in detail. The Application Program Interfaces (APIs) of compiler output are also given.2. A constructing method to store TMN-MIB is proposed and realized. Here, the managed objects are classified into four types: M-Based (storing all resource information in memory), MD-Based (storing the base managed object in memory and the list of attribute in persistent storage), MR-Based (storing the base managed object in memory and accessing the resource directly) and D-Based (storing all resource information in a database). To achieve those, a generic class is designed for the need of the basic managed object; as a result, the managed object class abstracted from the managed objects mentioned above can be derived from this generic class when corresponding attributes and methods are added. Finally, A MIB storage structure of a real application inherited from its super classes can be constructed.3. The translation mechanism of MIB from SNMP to TMN is proposed and implemented with C++ method, and as an example, a proxy that allows a TMN-based manager to manage an SNMP-based agent via CMIP is presented.4. The application of CORBA technology in TMN framework is discussed. Traditional TMN technology has difficulty in meeting telecommunication management technologies towards the opening, distributed and interoperating. CORBA can compensate for these shortcomings. Above all, a concise introduction of TMN and CORBA technologies and the basic problems to tackle in integrating CORBA and TMN are presented. Then, some current related researches are introduced, and the generic integration architecture isalso discussed.5. An algorithm used to map the management information defined by ASN.l/GDMO into those defined by IDL is proposed and implemented. The mapping procedure includes the definition of the interface inheritance relationship, error correcting mechanism required by CORBA and TMN objects, translation of the TMN notification and the multi-response of action into OMG event. The method to avoid the inheritance conflict is adopted. The translation process from basic and complex ASN.l modules into IDL that includes DEFAULT clause, OPTIONAL clause and ASN.l recursive definition is also shown.The implementation of the MIB structure presented in the dissertation plays an important role in developing the platform of military network management. Besides, the application of CORBA technology in TMN framework and the corresponding mapping algorithm of management information, provide efficient tools to develop the distributed network management in future.