[mrtg] Threshold monitoring

[Keith McCallion]

Has anyone hacked the threshold monitoring to catch large changes in
values? For instance, I use maximum threshold monitoring to catch when
my circuits are above 80% utilization. I would also like to see when my
circuits have large swings in utilization, which usually indicates
something weird going on (DoS, another circuit failure, bad BGP
announcements, device going down, etc).

This is especially useful for those of us with huge traffic variances
between peak and trough. A have interfaces that might be 75% utilized in
the evening and only 5% utilized at 3am. I need something to catch large
drops (or spikes) in traffic at peak without sending out false alerts
every night.

Has anyone written such a monitor, or is this something I need to put
together on my own?


Keith

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