Chapter 2 Introduction to Management Approach In this chapter, we introduce the main functions that should be included in a network management system and give a brief introduction to popular and well-known network management and system management approaches including Simple Network Management Protocol and new approaches Policy-based Network Management and Web-based Enterprise Management approaches. 2.1 Network management system At the earliest, the network is used to printer sharing, so the scale of network is not very large. The main work of network management is connection and configuration between hardware. But the evolution of computer network, network management not only being the monitoring facilities, it needs more efficient monitor and network status control methods to maintain system for daily operation and make a network have its maximum efficiency. For example, if a network is separate to several areas or sub networks, the operator must start up related link by configure routing table according to IP, sub network and subnet mask. The goal of network management is detect potential problems. Network management must correct problems before system breakdown, reduce the complexity of network management and ensure the maximum rate of packet transmission. http://140.134.26.20/wbem/img/fig2-1.JPG Fig. 2.1 Typical Network Management System Functionality There are five functions of network management were defined by the ISO (The International Organization for Standardization) in the document of ISO 7498-4, it shows in Fig. 2.1:
In this session, we discuss a common architecture of network management. Figure 2.2 depicts the basic network management architecture. The management station is mainly consisted of display and network management application components. Display displays the information to the operators and get control from operators, whereas the network management application communicates with the agent to get information from the managed devices. Agent serves as the broker between the management station and managed device, which implements a specific protocol for communication, for example, SNMP. This architecture simplies the management application design by separating the design of "managed-device part" and the "managing part". http://140.134.26.20/wbem/img/fig2-2.gif Fig. 2.2 Typical two tier structure for network management We can get specifically understand from Fig. 2.3 to know a client-server model that provides stack of communication protocol and interface between networks. When the Network Management Program send a request, Network Management Protocol encapsulate the request and through encapsulation in each layer. The request will be arrived in managed device and unpacked in each layer and agent can know what data the Network Management Program wants to know. Agent encapsulates the data into a packet by the same method and sends the packet to the Network Management Program. http://140.134.26.20/wbem/img/fig2-3.JPG Fig. 2.3 Relation to the stack of communication protocol and network |
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