[c-nsp] 100 meg throughput

[barney gumbo]

>From what I understand, "show interface summ" present the exact same data
that is presented by the rfc1213 MIB, which is what MRTG/RTG/Cacti etc uses
by default for tracking interface in/out bw utilization.  The data that show
int summ presents (if I recall correctly) is updated within 5 seconds and is
not the same as the load 30 or default 5 minute averages.

RTG is a great program for polling at 1 minute intervals, and it doesn't age
out data like MRTG.  This means it has a more complicated config and admin
requirements then MRTG, however it does work well.  It's amazing the traffic
utilization you can see with 1 min avg's as opposed to 5 min avgs.


On 12/15/05, Paul Stewart <pstewart at nexicomgroup.net> wrote:
>
> Thanks again to everyone to have replied to my original question..
> Hopefully I'm not starting a debate on this ;)
>
> I'm just looking for a "suggested utilization over 5 minute average" to
> exceed before adding an additional 100FE connection and with everyone's
> input I believe we'll be adding another 100FE shortly.
>
> Thanks again.
>
>
> Paul Stewart
> IP Routing/Switching
> Nexicom Inc.
> http://www.nexicom.net
>
>
> -----Original Message-----
> From: Jared Mauch [mailto:jared at puck.nether.net]
> Sent: Wednesday, December 14, 2005 9:57 PM
> To: David J. Hughes
> Cc: Paul Stewart; cisco-nsp at puck.nether.net
> Subject: Re: [c-nsp] 100 meg throughput
>
>        You may want to look at SNMP polling your router to get a higher
> level of interface utilization accuracy.  Find some package that will
> poll and show you data at a higher level of granularity than you will
> see with MRTG.
>
>        On 100m and slower links you'll start to see all the mini-spikes
> in traffic that are happening all the time.. This is why people have
> upgrade thresholds around 50%.  If you're seeing 80m, you're likely
> seeing bursts higher (as others have suggested).
>
>        I would try to upgrade your link to a second FE as soon as you
> can.
>
>        I really wish Cisco would make better counters available on this
> (like you can see on a Juniper, the stats are not weighted over 300
> seconds).
>
>        - jared
>
> On Thu, Dec 15, 2005 at 12:28:31PM +1000, David J. Hughes wrote:
> >
> > Just to state the obvious, but you could always set a 30 second
> > load-interval on the interface and have a closer look at the average
> > traffic load.
> >
> >
> > David
> > ...
> >
> >
> > On 15/12/2005, at 12:27 PM, Paul Stewart wrote:
> >
> > > Thanks for all the responses....
> > >
> > > When it gets over 80 meg it doesn't make it much further... Haven't
> > > been sure yet whether the traffic just isn't there, or if it's
> > > flatlining the connection... Either way, I'm making the assumption
> > > that 80 is the max on a 100 meg connection **based** on 5 minute
> > > averages... It seems like a safe bet in my opinion...
> > >
> > > Paul
> > >
> > >
> > > -----Original Message-----
> > > From: Chris Cappuccio [mailto:chris at nmedia.net]
> > > Sent: Wednesday, December 14, 2005 7:43 PM
> > > To: Eric Andrews
> > > Cc: Paul Stewart; cisco-nsp at puck.nether.net
> > > Subject: Re: [c-nsp] 100 meg throughput
> > >
> > > Eric Andrews [eric.m.andrews at gmail.com] wrote:
> > >>
> > >> it depends on the configuration of the interface, the packet size,
> > >> and
> > >
> > >> what it's connected to. what happens after 80Mbps?
> > >>
> > >
> > > If your 5 minute average shows that your pipe is at 80% utilization,
>
> > > then it's likely that you are actually spiking at 100% at which
> > > times you are dropping packets and providing a lower quality
> service.
> > >
> > > _______________________________________________
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> > >
> >
> > _______________________________________________
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>
> --
> Jared Mauch  | pgp key available via finger from jared at puck.nether.net
> clue++;      | http://puck.nether.net/~jared/  My statements are only
> mine.
>
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