Monitoring temperatures on Cisco equipment

[Jeffrey Watts]

I'm looking to monitor temperature on some various Cisco equipment (2821,
3750, 4948, 6509, etc).  I've looked at the check_catalyst_temp.pl and
check_env_stats.py plugins, which both look in .1.3.6.1.4.1.9.9.13.1.  I see
and understand the basic mechanisms of these checks.

What I don't understand is why both require warning and critical thresholds.
 From what I can tell, both walk ciscoEnvMonTemperatureStatusDescr, check
ciscoEnvMonTemperatureState (and alert accordingly) AND also check
ciscoEnvMonTemperatureStatusValue
to see if it's out of the warning and critical thresholds specified on the
command line.  I understand why one would want to be able to set custom
thresholds (that would override "normal" and "warning" states).  What I
don't understand is why are they required?  Is there a reason, or is it just
an oversight?  I don't have much experience monitoring network equipment, so
I'm wondering if there's a reason for it.

On that same note, does anyone know where those thresholds are stored?  I
see in the same OID that there is ciscoEnvMonTemperatureThreshold, but
that's an absolute upper bound before a forced shutdown occurs.  I'm
assuming that the thresholds for "warning" and "critical"
ciscoEnvMonTemperatureState
must be stored somewhere else.  Does anyone know where that is?

Unless there's a good reason for requiring -w and -c, I'll probably change
one of the plugins to not require them.

Thanks in advance,
Jeffrey.
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