From: Anthony Sequeira (terry.francona@gmail.com)
Date: Fri Sep 09 2005 - 12:03:31 GMT-3
Since, in the lab, you would lack the full Internet access you would need to
research the MIB variable - I would go to the proctor for guidance.
I would make it clear to the proctor that I fully understand the difference
between using ABSOLUTE and DELTA and then ask for any guidance they can
provide on the particular MIB variable.
By the way - I am guessing Cisco does not want to potentially fail you
based on some obscure MIB variable, so hopefully this is a proctor
discussion that will never need to take place.
Also, notice that vendor practice labs tend to stick to the areas of
Interface Counters (DELTA) versus CPU utilization (ABSOLUTE) - I think these
are the hot buttons!
On 9/9/05, Ralph <Mandela@myrealbox.com> wrote:
>
> Good point, Anthony.
>
> But what if the MIB given is not a familiar type, that is, I do not know
> its characteristics - I'm not sure if this MIB always increase or it
> actually fluctuates - how does someone know whether to use delta or absolute
> values?
>
> Regards
> Ralph
>
> -----Original Message-----
> From: Anthony Sequeira <terry.francona@gmail.com>
> To: Wireman <int_s0@earthlink.net>
> Date: Fri, 9 Sep 2005 10:30:16 -0400
> Subject: Re: RMON Alarms- Delta and Absolute
>
> I think the better way to go is to look at the counter that you are
> examining - not what information you are trying to gain.
> Here is a quote from Brian Dennis of InternetworkExpert on this matter
> that
> totally cleared it up for me. This quote is from their excellent Support
> Forum that you get access to when you purchase the R/S Workbook.
> Be sure to start using this forum if you are not already!
> "Values that only increase (i.e. input packets) should use delta. These
> values will never decrease and only increase so you to know the rate of
> change (delta).
>
> Values that increase and decrease (i.e. CPU utilization) should use
> absolute. You want to know what absolute value is (i.e. 35% CPU
> utilization,
> 80% memory utilization, etc) and not the rate of change in these values.
> Normally you don't really care if the CPU utilization increase 10% in 5
> minutes because if may have jumped up from 10% to 90% and back down to 20%
> in the 5 minutes. If is more important normally to know what the current
> CPU
> utilzation is. "
>
>
> On 9/8/05, Wireman <int_s0@earthlink.net> wrote:
> >
> > Searching through the archives I see this has been talked about, but I
> > have read a few examples that have confused me.
> >
> > Here is what I get from it please let me know if this is the correct
> > understanding :)
> >
> >
> > Absolute=
> > This is for things that I'm interested in knowing what the value is
> > currently.
> > For example - I want to know when my memory is 80% utilized, and I will
> > check for it every 2 minutes.
> >
> > And Absolute can also be used to monitor something like, I want to know
> > when I have processed 1,000,000 incoming packets. Something that has
> been
> > counting up since my last reload.
> >
> >
> > Delta=
> > This is when I want to look at averages/rate of change.
> > For example- This would be if I wanted to know in the last 5 minutes
> have
> > I used 40% more of my memory.
> >
> > This could be useful in this situation- I have a virus that is creating
> > thousands more NAT translations in just moments, and my memory went from
> 40%
> > to 95% in 5 minutes.
> >
> >
> > Is this right?
> >
> > Thanks,
> >
> > J Wireman
> >
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