[mrtg] Re: Link Errors on Router

[Larry Sheldon]

> Cant seem to get this to work..
> 
> This is the config. Its Port 1 on the Router
> (Serial Link) and it runs errors.
> 
> 
> Config :
> 
> Target[router.1err]: ifInErrors.1&ifOutErrors.1:public at router
> MaxBytes[router.1err]: 9900000
> Options[router.1err]: Growright, nopercent, integer
> YLegend[router.1err]: Errors
> ShortLegend[router.1err]: &nbsp
> Title[router.1err]: Router Link Errors
> PageTop[router.1err]: <H1>Error Analysis for Link</H1>
> 
> 
> snmpwalk 
> 
> (mrtg)[/usr/local/mrtg] root#snmpwalk router public ifInErrors
> interfaces.ifTable.ifEntry.ifInErrors.1 = 3757288
> 
> (mrtg)[/usr/local/mrtg] root#snmpwalk router public ifInErrors
> interfaces.ifTable.ifEntry.ifInErrors.1 = 3757289
> 
> ie they increase, but the mrtg graph is not changing.
> 
> Log Files..
> 
> 985751326 3757286 0
> 985751326 0 0 0 0
> 
> And the lines following are all "0 0 0 0 "
> 
> What have I done wrong or might be wrong ?

Here is my take.....

Unless the link is really seriously broken, the error rate is going to
be much less than 1 a second, which is going to (with integer aritmetic)
slide-rule out (that is a metaphor for realy old times, isn't it?) to
right around zero.

I don't have the arithmetic at hand an I'm too lazy to go dig it out
but the approach I use is to do the arithmetic necessary to get from
the "bytes per second" kind of thinking that MRTG does when unmolested
to "errors per hour" which I then graph.

> 
> Any help appreciated.

If that doesn't do it, I'll no doubt be on the machine where MRTG lives
here later today--I'll try to remember to fetch the actual arithmetic I use,
but you can see an example of the product at:
http://hummingbird.creighton.edu/mrtg/creighton-internet-serial.errors.html

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.                                                                       .
- L. F. (Larry) Sheldon, Jr.                                            -
. Unix Systems and Network Administration                               .
- Creighton University Computer Center-Old Gym                          -
. 2500 California Plaza                                                 .
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- 402 332-4622 (residence)                                              -
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