From: Darby Weaver (ccie.weaver@gmail.com)
Date: Sat Sep 20 2008 - 17:12:27 ART
Correct.
I did not mean to imply that this would influence MRTG, since it only uses 5
minute intervals. I was referring to the bits versus the bytes and how it
appears on graphs created by some of the programs like MRTG (out of the
context). Not meaning to imply it has any effect on MRTG graphs, sorry for
the mixup.
Usage Guidelines
If you want load computations to be more reactive to short bursts of
traffic, rather than averaged over 5-minute periods, you can shorten the
length of time over which load averages are computed.
If the load interval is set to 30 seconds, new data is used for load
calculations over a 30-second period. This data is used to compute load
statistics, including input rate in bits and packets per second, output rate
in bits and packets per second, load, and reliability.
Load data is gathered every 5 seconds. This data is used for a weighted
average calculation in which more-recent load data has more weight in the
computation than older load data. If the load interval is set to 30 seconds,
the average is computed for the last 30 seconds of load data.
The *load-interval* command allows you to change the default interval of 5
minutes to a shorter or longer period of time. If you change it to a shorter
period of time, the input and output statistics that are displayed when you
use the* **show interface* command will be more current, and based on more
instantaneous data, rather than reflecting a more average load over a longer
period of time.
This command is often used for dial backup purposes, to increase or decrease
the likelihood of a backup interface being implemented, but it can be used
on any interface.
Examples
In the following example, the default 5-minute average is set it to a
30-second average. A burst in traffic that would not trigger a dial backup
for an interface configured with the default 5-minute interval might trigger
a dial backup for this interface that is set for a shorter, 30-second
interval.
interface serial 0
load-interval 30
On Sat, Sep 20, 2008 at 3:31 PM, Shawn Zandi <szmetal@gmail.com> wrote:
> Load-interval?!
> Load data is gathered every 5 seconds, and u can't change it as u can see
> in output of show interface (it changes every 5 seconds),
> "Load-interval 30" makes router to calculate average rate based on "each 30
> seconds" instead of 5 minutes, its not related to data gathered by snmp, if
> u use MRTG it calculates (by Default) your bandwidth consumption based on
> Bytes instead of bits for each 5 minutes.
>
> Shawn Zandi,
> Routing, Switching & Security Consultant
> CCIE (Routing & Switching) - MCSE
>
>
>
> On Sat, Sep 20, 2008 at 10:49 PM, Darby Weaver <ccie.weaver@gmail.com>wrote:
>
>> And then we still have to take those Kbits and divide them by 8 to get the
>> bytes. Seems most non-engineer types have a hard time reading graphs from
>> outlike MRTG/PRTG and wonder why their input/output is not quite what they
>> expected.
>>
>> I suppose the truth is if everyone really understood how little traffic in
>> terms of megabytes actually crossed the network in many under One-Billion
>> dollar companies, then many of these companies accounting department might
>> ask themselves what they are really paying for.
>>
>> In the meantime, bits look like impressively large numbers to the layman.
>>
>> I agree with victor on using the load-interval command to help get a more
>> granular view on the bps crossing the interface.
>>
>>
>>
>>
>> On Sat, Sep 20, 2008 at 4:45 AM, Victor Cappuccio <vcappuccio@gmail.com
>> >wrote:
>>
>> > That would be great to do as well, but I think that you can just tune is
>> > the
>> > time of the load interval
>> >
>> > Router(config)#int s0/0
>> > Router(config-if)#load-interval ?
>> > <30-600> Load interval delay in seconds
>> >
>> > I always try to change those values in real production network, because
>> you
>> > can now in 30 sec how much bps is crossing over that interface in
>> > particular
>> > but anyways, The notation you see at the show policy-map or the output
>> > rate
>> > from the show interface is based on my opinion in the SI prefixes for
>> > decimal multiples http://members.optus.net/alexey/prefSI.xhtml, now you
>> > can
>> > just in your mind divide by 1000 and you get the kbits/sec you are
>> asking
>> > for.
>> >
>> > My 2 Cents
>> > Victor.-
>> >
>> >
>> > On Fri, Sep 19, 2008 at 5:42 PM, vignesh sethuraman <
>> > sethuvignesh@yahoo.co.in> wrote:
>> >
>> > > Hello Experts,
>> > >
>> > > I have a question regarding the 5 minute input/output rate.
>> > >
>> > > In the output of show interface <int number>, we will be seeing 5
>> minute
>> > > input rate/output rate in bits/sec. Is it possible to make the device
>> > show
>> > > it
>> > > in kbits/sec.
>> > >
>> > > Thanks,
>> > > Vignesh
>> > >
>> > >
>> > >
>> > > Connect with friends all over the world. Get Yahoo! India
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>> > >
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>> > >
>> > >
>> >
>> >
>> > --
>> > Victor Cappuccio
>> > CCIE R/S# 20657
>> > CCSI# 30452
>> > www.anetworkerblog.com
>> >
>> >
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