[mrtg] Re: Strange spikes with summer (router0 + router1) traffic
lsheldon at creighton.edu
Mon May 21 18:42:27 MEST 2001
I actually have no clue as to what the problem is, but I did have the
following off-the wall conjecture while reading this . . . .
> I'm seeing these strange spikes in some summed graphs (two routers added
> together with the + in the config). The usual traffic is in the several
> hundred k range on each router, but occasionally there will be huge spikes
> to 48 Mb and other very high numbers even though the graphs of the two
> routers seperatly do not show this much traffic when added together by
> hand. I have another summed graph of a router port and an SNMPd port on a
> UNIX box that behaves in a similar way, but the spikes do not line up
> time-wise between the router+router and router+server graphs.
> Most of the time the graphs show the correct traffic amounts, but it looks
> like occasionally there will be a single sample to many megabits and then
> it goes back to normal. This is on MRTG 2.9.10 running on a Redhat Linux
> 7.0 box (with some of their patches installed). Does anyone have any idea
> what might be causing these spikes and any suggestions for a possible fix?
What if the summing happens at a place that the ability to detect a counter
roll-over is lost? (Counter roll-over handled in the individual graphs,
but not on the summed graph?)
- L. F. (Larry) Sheldon, Jr. -
. Unix Systems and Network Administration .
- Creighton University Computer Center-Old Gym -
. 2500 California Plaza .
- Omaha, Nebraska, U.S.A. 68178 Two identifying characteristics -
. lsheldon at creighton.edu of System Administrators: .
- 402 280-2254 (work) Infallibility, and the ability to -
. 402 681-4726 (cellular) learn from their mistakes. .
- 402 332-4622 (residence) -
. http://www.creighton.edu/~lsheldon Adapted from Stephen Pinker .
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