[rrd-users] Re: clearing of counters on Cisco switches

[Stephan Harren]

Surely it will help to set a max, but btw, sometimes cisco counters jump above 
the interface capacity. For example, they show up that you transfer an 
average of 224 MBit/s over a FastEthernet-Interface. For this kind of stuff 
you really need to set a max of 100 MBit. 

Best regards,

Stephan

Am Dienstag, 28. Januar 2003 10:02 schrieb Serge Maandag:
> I regularly clear the interface counters, I do it on the command line
> though.
> That also clears the in- and outoctets. It never caused peaks in my
> graph.
>
> Do you have a max set for the ds's in your rrd? try rrdtool info to
> check.
>
> Serge
>
> -----Original Message-----
> From: Scott P. Daffron [mailto:scott at cs.odu.edu]
> Sent: Monday, January 27, 2003 6:37 PM
> To: rrd-users at list.ee.ethz.ch
> Subject: [rrd-users] clearing of counters on Cisco switches
>
>
>
>
> RRDTOOL gurus,
>
> We have noticed that our installation of MRTG+RRDTOOL+14all.cgi shows a
> huge spike on our Cisco interface graphs whenever a "clear counters" is
> done on the device.  This is becoming a big problem for us, as we have
> just implemented a new NMS which clears all counters once per day.  We
> run
> MRTG with RRDTOOL and 14all.cgi, and this problem is seen in the latest
> versions of each.  MRTG alone does NOT exhibit this behavior.
>
> I know this is an issue of the OID counter wrapping, but why is it that
> MRTG alone handles this and the RRDTOOL implementation does not.  Is
> there
> a way to tweak RRDTOOL or 14all.cgi to better handle this wrapping
> situation?
>
> More info on my setup:
> - Switches are Cisco Cat 4006 and 5XXX
> - Our NMS is resetting all port counters by doing an snmpset on
>   private.1.9.5.1.1.13.0.  Most people do not believe me, but this DOES
>   reset the ifOctets value to 0, by design.
>
>
> Thanks in advance...
>
>
> Scott Daffron
> Network Engineer
> Sentara Health Care

-- 
Stephan Harren
Manager Site Operations
MFN-IS
-------------------------------
Phone +49 69 90554 153
Fax +49 69 90554 111
Cell +49 173 7011126

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