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In general, the Net-SNMP suite consists of relatively low-level tools, and there is nothing included that is designed for high-level, long-term monitoring of trends in network traffic, disk or memory usage, etc.

There are a number of packages available that are designed for this purpose. Two of the most widely used are MRTG (http://www.mrtg.org/) and RRDtool (http://oss.oetiker.ch/rrdtool/). There are also several frontends built on top of RRDtool, including Cacti (http://www.cacti.net/) and Cricket (http://cricket.sourceforge.net/). There are details of how to set up Cricket to monitor some of the UCD extensions at http://www.afn.org/~jam/software/cricket/

We have also set up a page that describes in detail how MRTG can be set up to monitor disk, memory and cpu activity at http://www.net-snmp.org/tutorial-5/mrtg/index.html

There is also a web-based network configuration system "Net-Policy", based upon SNMP. This is not strictly connected to the Net-SNMP project, but a number of the core developers are also involved with that system. See http://net-policy.sourceforge.net for more details.