[mrtg] False Graph

[Jan Ferré]

Hi Pyae - or Wai :)

As I can't see your graph, I can't be all sure - but I expect you're
facing the  problem of counter overflow, which is really common on fast
links.

Be sure to read the long integer counters in SNMPv2 instead of the short
integer counters in SNMPv1:

ifHCInUcastPkts.<ifindex>&ifHCOutUcastPkts.<ifindex>:<community>@<A.B.C.D>:::::2

The overflow generates a graph which typically increases from 'night'
until a certain level (around the 200 M) then drops to zero and
continues the 'normal' trace during 'day' - and then back.

Best regards

Jan Ferré


Pyae Phyo Wai wrote:
> On 2/1/10, Pyae Phyo Wai <pyaephyowai at gmail.com> wrote:
>   
>> Dear ALL
>> I'm also facing terrible problem with mrtg false graph. I hv attached
>> WAN gigabit interface of cisco router. When bandwidth over 200 Mbits/s
>> , graph goes false. When i monitor real time, it show nearly
>> 300Mbits/s in router. I use SNMP version 1 for mrtg as well as my
>> router , also use-default 16 bits option for mrtg. other interfaces on
>> switch isn't much differ with real time traffic. but cisco router
>> I attach graph and cfg reference. Please take a look.
>>
>> Target[x.x.x.x]: 9:monitor at x.x.x.x:::::1
>> SetEnv[x.x.x.x]: MRTG_INT_IP="x.x.x.x"
>>  MRTG_INT_DESCR="GigabitEthernet11/0/0"
>> MaxBytes[x.x.x.x]: 125000000
>> Title[x.x.x.x]: *** WAN interface***
>> PageTop[x.x.x.x]: <h1>*** WAN interface***</h1>
>>
>>
>> Any idea ?
>>
>> Hope for advice from you soon.
>>
>> With Regards
>> JLP
>>
>>     
>
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-- 
Jan Ferré - UNI-C Netdrift - DTU Bygning 304, DK-2800 Lyngby
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