[mrtg] Re: How mrtg works ?

[Roth, Gabrielle]

> -----Original Message-----
> From: Giuliano Cardozo Medalha [mailto:giuliano at usp.br]
> Sent: Thursday, March 07, 2002 8:59 PM
> To: mrtg at list.ee.ethz.ch
> Subject: [mrtg] How mrtg works ?

> I've been doing a lot of stats graphs using MRTG.
> I have some daults abou how it woks, when I use the cfgmaker script:
> First - What object ID (OID), the cfgmaker script uses on a default 
> configuration like this:

Well, dang.  I was sure this was in a FAQ or the docs somewhere but I can't
find it right now.

By default, mrtg monitors ifInOctets and ifOutOctets from the IF-MIB.
 
> The router can be a lot of interfaces: including aal5, frame 
> relay pvc, serial, ethernet, fast ethernet
> How the script manipulates each type of interface ?
> It uses some kind of standart OID MIB ?

IF-MIB.
http://www.icir.org/fenner/mibs/mib-index.html
http://www.icir.org/fenner/mibs/mib-index.html#IF-MIB

> Another thing is that we found a document on cisco that 
> explains how to 
> get traffic analisys for frama relay circuits:
> 
(link corrected)
http://www.cisco.com/warp/public/477/SNMP/snmp-indx.html          
>  (how to of snmp) 
> 
> We did the config and try to compare with MRTG.
> 
> Wen we compared the two values (one of then for 1 sec and the 
> other form mrtg) they are very different

Different how?  If you were comparing a raw counter value with mrtg, yes,
they are going to be different.  The two are not really comparable.


-gabrielle
"Gravity:  It's not just a good idea, it's the law."

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