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Chapter 15
SNMP
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SNMP Overview
SNMP (Simple Network Management Protocol) has gained the most extensive application on
the UDP/IP networks. SNMP provides a management frame to monitor and maintain the
network devices. It is used for automatically managing the various network devices no matter
the physical differences of the devices. Currently, the most network management systems are
based on SNMP.
SNMP is simply designed and convenient for use with no need of complex fulfillment
procedures and too much network resources. With SNMP function enabled, network
administrators can easily monitor the network performance, detect the malfunctions and
configure the network devices. In the meantime, they can locate faults promptly and implement
the fault diagnosis, capacity planning and report generating.

SNMP Management Frame
SNMP management frame includes three network elements: SNMP Management Station,
SNMP Agent and MIB (Management Information Base).
SNMP Management Station: SNMP Management Station is the workstation for running the
SNMP client program, providing a friendly management interface for the administrator to
manage the most network devices conveniently.
SNMP Agent: Agent is the server software operated on network devices with the responsibility
of receiving and processing the request packets from SNMP Management Station. In the
meanwhile, Agent will inform the SNMP Management Station of the events whenever the
device status changes or the device encounters any abnormalities such as device reboot.
MIB: MIB is the set of the managed objects. MIB defines a few attributes of the managed
objects, including the names, the access rights, and the data types. Every SNMP Agent has its
own MIB. The SNMP Management station can read/write the MIB objects basing on its
management right.
SNMP Management Station is the manager of SNMP network while SNMP Agent is the
managed object. The information between SNMP Management Station and SNMP Agent are
exchanged through SNMP (Simple Network Management Protocol). The relationship among
SNMP Management Station, SNMP Agent and MIB is illustrated in the following figure.
Figure15-1 Relationship among SNMP Network Elements
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