Snmpstatus/aggregate bandwidth

[Tedman Eng]

> -----Original Message-----
> From: John C. Welch [mailto:johnwelch at kclife.com]
> > 
> > You are not using the right tool.
> > Nagios is not the tool for concatenating these things.

> No, for this, Nagios is perfect. I need one graph. Not one 
> per port. Nagios
> is really quite perfect for monitoring single things.

> There is a single SNMP command that will give me this. 
> snmpstatus. It does the aggregation for you. Read the man page, it's
really quite 
> handy. All I wanted to know is if someone had a plugin for it, or knew of 
> a plugin that did this.
> 
> Again, I need Nagios to monitor the results of an existing 
> SNMP command.
> Seems that's Nagios' sweet spot.
> 

snmpstatus reads and displays system counters which are point-in-time
values, not deltas or rates (which is what bandwidth is).

The difference between what you're looking for and a stock Nagios
installation is that Nagios is (in a simplified sense) completely stateless.
It does not remember what the last output value was. (it remembers only what
the last problem state was)

A trending application like RRDtool does however calculate rates, it does so
by comparing counter values against timestamps. 
ie (283443 bytes - 212874 bytes / 500 sec) = XXX bytes/second = bandwidth

So, how do you monitor bandwidth in Nagios?
Perhaps you're looking for the check_traffic plugin:
http://nagios.sourceforge.net/download/contrib/misc/check_traffic/
The plugin records values and timestamps to a file (/tmp/traffic) and
calculates the difference in value from the previous invocation, resulting
in a traffic rate.  It can optionally use RRDtool.

Monitoring and trending are two separate but complimentary applications,
which is probably why Cacti and Nagios are used side-by-side in many shops.



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