Thorsten,
Not quite sure what are you trying to do, and I am afraid you MIB RegExpr
means nothing.
First, you are right, no "less them" for snmpCollect on Unix, and I must say
that is very weird. I was wondering, what would IBM say about that.
I looks like you have your IPs "inUse" and "free" mibs, and it looks like
you have no choice but to monitor your "inUse" values, and decide what you
maximum limit is and set the snmpCollect to trigger the trap if "inUse" goes
above the specified numbers of IP assigned to DHCP clients.
I usually do simple ratios in %. This is a formula:
"inUse" "inUse"
-------- * 100 or ----------------- * 100
"Total_IP" "inUse + free"
You total is well known number, or just a MIB,.. If you don't have that then
do this:
"inUse"
"inUse"
"free" +/ 100 *
Dejan
> -----Original Message-----
> From: Mildeberger, Thorsten [mailto:thorsten.mildeberger AT eds DOT com]
> Sent: Friday, January 03, 2003 11:25 AM
> To: nv-l AT lists.tivoli DOT com
> Subject: [nv-l] MIB expression does not work correctly
>
>
> Hi all,
> sorry for stressing you all up again, but these are really my
> first attempts
> in the "snmpCollect / mibExpr.conf" area.
>
> I´m working on DHCP monitoring. Therefore I loaded the DHCP.mib and looked
> for a way to monitor the amount of "free DHCP addresses". The MIB
> variable,
> that has to be used here best, is named "noAddFree" (number of free
> addresses).
>
> problem 1:
> is there really no way to use a "less than" operator for specifying
> thresholds? I´m lost. All I can see in Netview is this hardcoded "greater
> than" symbol. It would be quite easy to compare MIB variable "noAddFree"
> against a threshold using a "less than" operator.
>
> problem 2:
> I made some testing with a self-made MIB expression. In theory it returns
> the amount of DHCP addresses, that are still free. To be able to use the
> hardcoded "greater than" operator, the value of this expression is always
> negative.
>
> That is the expression:
>
> DhcpStillFree \
> "noAddinUse - (noAddFree + noAddinUse)" \
> .1.3.6.1.4.1.311.1.3.2.1.1.2. \
> .1.3.6.1.4.1.311.1.3.2.1.1.3. \
> .1.3.6.1.4.1.311.1.3.2.1.1.2. + -
>
> snmpCollect is gathering data, but for some reason the values shown are
> always equal to "0". On the other hand the MIB browser is showing the
> correct values for MIB variables "noAddinUse" and "noAddFree", so I´m
> wondering a little. Is it also not allowed to use and display negative
> thresholds? Hopefully not!
>
> Who can shine some light on me please. Thanks a lot for all your
> great help
> and support!!! I won´t forget it :o)
>
> We are going with Netview 7.1.2.
>
> best regards,
> > Thorsten Mildeberger
> >
> > EMS Solutions - SMC Tools & Automation
> > GOSD - Central Region
> > EDS Deutschland GmbH
> > Eisenstr. 43
> > 65428 Rüsselsheim
> > Tel.: +49 (0) 6142 80-3706
> > Fax.: +49 (0) 6142 80-3030
> > mailto:thorsten.mildeberger AT eds DOT com
> >
>
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