Qtech QSW-3900-48-SFP-DC [33/245] Brief introduction of snmp
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Qtech QSW-3900-48-SFP-DC [33/245] Brief introduction of snmp

Qtech QSW-3900-48-SFP-DC [33/245] Brief introduction of snmp
QTECH Software Configuration Manual
2-32
2.8 Monitor system by SNMP
2.8.1 Brief introduction of SNMP
SNMP(Simple Network Management Protocol)is an important network management protocol in TCP/IP
network. It realizes network management by exchanging information packets. SNMP protocol provides possibility of
concentrated management to large sized network. Its aim is guaranteeing packet transmission between any two points
to be convenient for network administrator to search information, modify and search fault, finish fault diagnosising,
capacity planning and creation reporting at any network node. It consists of NMS and Agent. NMS (Network
Management Station), is the working station of client program running, and Agent is server software running in
network devices. NMS can send GetRequest, GetNextRequest and SetRequest packet to Agent. After receiving
requirement packet of NMS, Agent will Read or Write management variable according to packet type and create
Response packet, and return it to NMS. On the other hand, the Trap packet of abnormity of cold boot or hot boot of
devices will send to NMS.
QTECH company is present it own QTECH NMS and Agent server. Please refer to the http :
//www.QTECH.ru/support/software.htm
System supports SNMP version of v1, v2c and v3. v1 provides simple authentication mechanism which does
not support the communication between administrator to administrator and v1 Trap does not possess authentication
mechanism. V2c strengthens management model (security), manages information structure, protocol operation, the
communications between managers, and it can create and delete table, and strengthen communication capacity of
managers, and reduce the storage operation of agency. V3 realizes user distinguishing mechanism and packet
encryption mechanism, and greatly improves security of SNMP protocol.
Simple Network Management Protocol (SNMP) offers a framework to monitor network devices through
TCP/IP protocol suite. It provides a set of basic operations in monitoring and maintaining the Internet and has the
following characteristics :
· Automatic network management : SNMP enables network administrators to search information, modify
information, find and diagnose network problems, plan for network growth, and generate reports on network
nodes.
· SNMP shields the physical differences between various devices and thus realizes automatic management of
products from different manufacturers. Offering only the basic set of functions, SNMP makes the
management tasks independent of both the physical features of the managed devices and the underlying
networking technology. Thus, SNMP achieves effective management of devices from different manufactures,
especially so in small, fast and low cost network environments.
2.9 SNMP Mechanism
An SNMP enabled network is comprised of network management station (NMS) and Agent.
NMS is a station that runs the SNMP client software. It offers a user friendly human computer interface,
making it easier for network administrators to perform most network management tasks. Currently, the most
commonly used NMSs include Quidview, Sun NetManager, and IBM NetView.
Agent is a program on the device. It receives and handles requests sent from the NMS. Only under certain
circumstances, such as interface state change, will the Agent inform the NMS.
NMS manages an SNMP enabled network, whereas Agent is the managed network device. They exchange
management information through the SNMP protocol.
SNMP provides the following four basic operations :
Get operation : NMS gets the value of a certain variable of Agent through this operation.
Set operation : NMS can reconfigure certain values in the Agent MIB (Management Information Base) to
make the Agent perform certain tasks by means of this operation.
Trap operation : Agent sends Trap information to the NMS through this operation.

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