[rrd-users] Re: Oddly excessive bandwidth reports coming from a T1, read on for details

Matus Telgarsky mit at juilliard.edu
Tue Apr 23 05:38:26 MEST 2002

On Mon, 22 Apr 2002 13:26:19 +0200 (CEST)
Alex van den Bogaerdt <alex at slot.hollandcasino.nl> wrote:


> The average shown is 3.480605e+05bps; this is 348060.5 which is
> well within the limits.

that average is for a large chunk of time, so it doesn't mean anything.
the point is that at any one given moment we aren't supposed to be able to
exceed 1.54.

for example, if for 1% of the time I'm 2x the maximum, and for the rest of
the time I'm at 0, the average will be 2% of the maximum, even though
I exceeded the top

> Before we go any further I want you to make sure you don't:
> 1) add up ifInOctets and ifOutOctets and compare that to 1.544 Mbps

well.. there's a line going through the graph at that peak value, and
the in and out are clearly stacked.

what seems odd is that we seem to get 1.54 max in and 1.54 max out on
_each_ T1, rather than 1.54 aggregate.  it makes no sense (this is really
clear on some of the graphs.

cheers, and thanks.


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