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User Manual
9-1
Chapter 9 SNMP Management
UNDERSTANDING SNMP
As local area network (LAN) environments became standardized over the past
ten years, multi-vendor equipment grew with competition. It became necessary
to manage the various vendor equipment from a single control console. Thus,
SNMP emerged as the standard for managing commercial TCP/IP networks.
The term SNMP broadly refers to the message protocols used to exchange infor-
mation between the network management station and the managed devices, as
well as to the structure of network management databases.
Basic Components
SNMP has three basic components: Network Manager, Agent, and MIB (Manage-
ment Information Base).
Network Manager
The network manager 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
The agent 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 network device.
MIB
The MIB 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 particular piece of information about a
network device, the network manager transmits the request to that network
device. The agent in that device interprets the incoming request, performs the
requested task, and sends its response to the network manager. The network
manager collects all the data from the various network devices and presents it in a
consistent form.