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61200176L1-1 Express 6100/6120 User Manual C-1

Appendix C

SNMP

UNDERSTANDING SNMP

As Local Area Network (LAN) environments became standardized

over the past ten years, multi-vendor equipment grew with competi-

tion. It became necessary to manage the various vendor equipment

fromasinglecontrolconsole. Thus,theSimpleNetworkManagement

Protocol (SNMP) emerged as the de facto standard for managing com-

mercial Transmission Control Protocol/Internet Protocol (TCP/IP)

networks.

The term SNMP broadly refers to the message protocols used to ex-

changeinformationbetweenthenetworkandthemanageddevices,as

wellastothestructureofnetworkmanagementdatabases. SNMPhas

three basic components:

• Network Manager: This is a control program that collects,

controls, and presents data pertinent to the operation of the

network devices. It resides on a network management station.

• Agent: This is a control program that responds to queries and

commands from the network manager and returns requested

information or invokes configuration changes initiated by the

manager. It resides in each networkdevice connected.

• MIB: This is an index to the organized data within a network

device. It defines the operating parameters that can be controlled

or monitored.

When requesting the network manager to retrieve or modify a partic-

ularpiece ofinformation about anetwork device,the networkmanag-

er transmits the request to that network device. The agent in that

device interprets the incoming request, performs the requested task,

and sends its responseto the networkmanager. The network manag-

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ADTRAN Express 6120 Bedienerhandbuch Seite 127