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TCP/IP SNMP Operational Model, Components and Terminology.
(Page 2 of 3)
Each device that participates in
network management using SNMP runs a piece of software, generically
called an SNMP entity. The SNMP entity is responsible for implementing
all of the various functions of the SNMP protocol. Each entity consists
of two primary software components. Which components comprise the SNMP
entity on a device depends of course on whether the device is a managed
node or a network management station.
Managed Node Entities
An SNMP managed node can be pretty
much any network device that can communicate using TCP/IP, as long as
it is programmed with the proper SNMP entity software. SNMP is designed
to allow regular hosts to be managed, as well as intelligent network
interconnection devices such as routers, bridges, hubs and switches.
Other unconventional devices can likewise be managed, as
long as they connect to a TCP/IP internetwork: printers, scanners, consumer
electronic devices, even specialty medical devices and more.
The SNMP entity on a managed node
consists of the following software elements and constructs:
Network Management Station Entities
- SNMP Agent: A software program that implements
the SNMP protocol and allows a managed node to provide information to
an NMS and accept instructions from it.
- SNMP Management Information Base (MIB):
Defines the types of information stored about the node that can be collected
and used to control the managed node. Information exchanged using SNMP
takes the form of objects from the MIB.
On a larger network, a network management
station may be a separate, high-powered TCP/IP computer dedicated to
network management. However, it is really software that makes a device
into an NMS, so the NMS may not be a separate hardware device. It may
act as an NMS and also perform other functions on the network.
The SNMP entity on a network management
station consists of:
- SNMP Manager: A software program that
implements the SNMP protocol, allowing the NMS to collect information
from managed nodes and to send instructions to them.
- SNMP Applications: One or more software
applications that allow a human network administrator to use SNMP to
manage a network.
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Version 3.0 - Version Date: September 20, 2005
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