[mrtg] Re: Counter Wrap adding multiple interfaces

[Tobias Oetiker]

Today Steve Rogers wrote:

> Using mrtg 2.9.17 with RRDTool to get in/out on 6 FastEthernet interfaces on
> 6 different cisco boxes.
> The Target looks like this:
>
> Target[xxx-total-band-all]:
> ifHCInOctets.1&ifHCOutOctets.1:community at 10.X.X.X:::::2 +
> ifHCInOctets.1&ifHCOutOctets.1:community at 10.X.X.X:::::2 +
>  #Fa4/0/1:community at 10.X.X.X + #Fa4/0/1:community at 10.X.X.X +
> #Fa4/0/1:community at 10.X.X.X + #Fa4/0/1:community at 10.X.X.X
>
> This is collected every 5 minutes and when the in octets rate hits around
> 115Mbps the graph drops to about 20Mbps. I thought that mrtg handles counter
> wraps? Any ideas on why this should happen? Does mrtg handle counter wrap if
> the target is an external script?


not with math in the target ... for fast interfaces the date you
get tends to be totally erratic ... use snmp v2

cheers
tobi
>
> Thanks
> Steve
>
>
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