SNMP Traps in Nagios

[Travis]

Hello all -
     I have a question regarding SNMP traps in Nagios. From my
understanding, this can be done differently depending on what you need and
how things are configured on your network. At this point, I am currently
using Nagios with Active Service/Host checks only. I'm monitoring Internet
accessible services such as status of POP/SMTP/Web/SSh/DNS etc.. and I'm
monitoring local services such as partition usage/load average/processes
etc.. via the NRPE daemon/client application. However, all these checks are
using the plugins that were provided with the Nagios installation and some
of my own small scripts.

    Currently on our Cisco routers, we are able to monitor whether or not
the interface link is up or down, we can also be notified if a link load
passes a certain threshold, say 80%. Again, these are just using the plugins
available either from the Nagios installation or from Nagios exchange. But
what I want to be able to do, is configure traps so that Nagios can be
notified when other things occur such as: power supply failure, input queue
reaching a certain level, latency if possible and many other things that are
defined in the default MIB of our Cisco routers.

   So my question is, what is the best way to monitor these things? What are
all my options? My understanding is that I would have to configure the traps
on the Cisco device to send event information to a central snmptrapd, then
that info is passed on to the Nagios host which is listening for Passive
Checks which will then alert us via pager/email etc..

   But my question is, how is all this done? How do I configure the
Monitored host to send these events to snmptrapd? How do I configure the
snmptrapd? How do I configure snmptrapd to pass this info onto Nagios?  Do I
need to use SNMPTT as an event correlator or not?  If so, how is that
configured? What all has to be defined in Nagios for the paging to happen
once it sees the passive check result in the external command file?

   Anyway, I am open for suggestions. Examples of how things are configured
would be great. Try to break it down so that I can understand what's doing
what and how.

   All suggestions / information is greatly appreciated. Even if it's just
pointing me to the right documentation. Thanks a bunch !!!
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