Siemens OSM User Manual download pdf (Page 14)

Introduction

1-2

Industrial Ethernet OSM/ESM Network Management

C79000-G8976-C137-08

1.1 Network Management with SNMP

The Industrial Ethernet OSMs (Optical Switch Modules) and Industrial Ethernet

ESMs (Electrical Switch Modules) have SNMP and Web Based Management. This

chapter briefly explains the basics of network management with SNMP and

Web-Based Management.

In the past, homogeneous office networks installed with components from one

manufacturer could also be maintained and administered with the proprietary

management systems provided by the manufacturer. Due to the constant increase

in the size of networks and internetworking involving the widest variety of different

network types (for example an intranet), these proprietary management systems

often reach their limits.

The problem was solved in the eighties with the introduction of the Simple Network

Management Protocol (SNMP) by the Internet Activities Board (IAB). This standard

was readily accepted by the network industry and solves the essential tasks of a

network management system.

1.1.1 Function

Client/Server Model

A network management system that uses SNMP works according to the

client/server model. The management station or simply manager (client) can query

status information from the components it is responsible for controlling. These

components can be widely differing devices within the network system, such as

network components, switches, hubs or DTEs such as workstations, PCs or

network printers.

Agent

An agent (server) is installed on all of these devices. This agent that is normally

implemented on the components as software functionality provides the

management system with station-specific data or receives configuration data.

Access to the components by the management station (both reading and writing) is

cyclic and uses the network management protocol (SNMP).

The station data provided by the agent is stored in structured form in the MIB

(Management Information Base, see below).

The agent not only has the task of providing data when requested by the

management station, but can also react event-driven by sending a message known

as a trap to the management station.

Communication between the management station and agents involves only an

insignificant increase in overheads on the network during operation.

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Siemens OSM User Manual Page 14