[mrtg] help:strange graphics

[Hui Zhang(PSO)]

> hello everyone!
> I am very glad MRTG can monitor Cisco 6xxx Switch.It seem no problem to
> monitor single port of the switch. but in the project 
> we need combine more than two port as a virtual port. in the MRTG.cfg, it
> is as this :
> (1)11:public at 202.97.10.253
>      MaxBytes:125000000
> (2)11:publilc at 202.97.10.254
>      MaxBytes:125000000
> (3)11:public at 202.97.10.253 +11:public at 202.97.10.254
>     MaxBytes:2500000000,
> I think the (3) should be  the result of (1) + (2).	but the result has a
> little strange.the trend of graphic in (3) is almost same as (1) +(2), but
> in many collect point the value is very low.It is not equal the plus of
> (1) and (2).In theory, the traffic of the port should be the minus of the
> current value and the last value in the Octets object.It maybe a negative
> when the last value close to the counter. I consider MRTG has some process
> when this situation happens.so the result of (1) and (2) seem very good.
> but to (3)((1)+(2)), Is there some other consideration? the (3) result is
> :|(1)|+ |(2)| or |(1)+(2)| or overflow?Due to emergence, I can't find the
> detail of the MRTG, would you help me? 
> thanks a lot!!!
> (the attach was the result html)  <<switchA11+switchB11-day.png>>  
> <<switchA11-day.png>>  <<tSwitchB11-day.png>> 
> Sunny Zhang
> Tel: 62501658 Ext. 6386
> Email: zhanghui2 at asiainfo.com
> 
> 
> 


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