Research And Implementation Of WAN Based Distributed Network Management System

Network management system(NMS) is a significant part of networks. As a major direction of computer science field, network management has attracted a large number of scholars and experts to make intensive studies of it. CWMP protocol, a management protocol over wide area network(WAN), has the features of high safety, strong reliabitity and wide applicability.This paper firstly introduced the CWMP protocol in detail and made a comparison with SNMP protocol. After illustrating the five basic tasks of NMS, this paper indictated an architecture of distributed CWMP networks manament, and divided the ACS into four modules:data model proceeding, network management task scheduling, distributed server communicating and CWMP message parsing and disposing; and also illustrated operational principle and workflow of every module. The essence of data model proceeding module is to transform the data model from hierarchical model to object-oriented model. It is feasible to utilize XML to build up mapping between each pair of node and make use of Java Reflect in transforming. The module of network management task scheduling is the core of ACS while working. It builds up task queue of every device; and creates new tasks for management operation then inserts them into the corresponding queue; and finishes each task by priorities. The module of parsing and disposing of CWMP message is to transform SOAP message which is of linear structure into specific CWMP object for the convience of manipulating.Secondly, this paper has made a study of communication model on distributed processes, which is also a module in ACS, and propose the multi-broker-nodes model after analyzing merits and drawbacks of present models. Moreover, the component named ReplicatedHashMap in JGroups is used to increase the efficiency in communication. Afterward, the paper put forward a plan for application of Broker model in NMS, which will further increase the system efficiency.Finally, based on the requirements of NMS basic tasks, this paper has given an implementation plan of CWMP based NMS which includes fault management, configuration management and security management, and has made and verified a prototype of system which implements the management of network devices. Afterwards, this fully designed NMS is also shown with figures of screen shot in system running.