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Network management models
Issue 6 January 2008 261
● Monitors any SNMP variable that you choose. You can even use an external program to
gather the data that MRTG should monitor, for example:
- System load
- Login sessions
- Modem availability
For more MRTG information, see:
● http://www.mrtg.org for the main MRTG Web site. Their product is available free of charge
under the terms of the GPL.
● http://www.ee.ethz.ch/stats/mrtg/ for an example.
HP OpenView Network Node Manager
HP OpenView Network Node Manager (NNM) and Network Node Manager Extended Topology
together provide your management team with the capabilities that you need to address your key
business and network challenges:
● A new approach to root-cause analysis that includes a set of easy-to-use tools to help you
identify and resolve conditions before they become problems.
● ID for Networks delivers advanced capabilities for network event reduction, root-cause
analysis and a new management concept called State Analysis, which actively determines
the health of network protocols and complex network configurations.
● Includes out-of-the-box correlators for enhanced root-cause analysis and the new
Correlation Composer to easily tailor the out-of-the-box correlators that are shipped with
Network Node Manager to fit your particular needs.
● The NNM serves as a SNMP manager, trap collector, and connectivity tester. It also acts
as a framework for the attachment of other programs, such as Avaya Network
Management Console with VoIP SystemView.
● Topology discovery visually shows the interconnection of routers, switches, and endpoints.
Network management models
There are two basic network management models:
● Distributed — specialized, nonintegrated tools, and sometimes organizations, to manage
discrete components.
● Centralized — integrated network management tools and organizations for a more
coherent management strategy.