[mrtg] peak on graph after "incident"

Chris Conn cconn at abacom.com
Mon Oct 20 21:23:45 MEST 2003


I have searched the archives and am sure this has been asked before, however I 
cannot come up with any information on this.

I have noted that when a unit for some reason is unresponsive/down to a SNMP 
request for reasons ranging from packet loss, link instability or a simple 
reboot, the following SNMP reply generates a very large peak of traffic that in 
fact was not present on the link, sometimes several megabits and several times 
faster than the link can accomodate.  I understand the possibility of using 
AbsMax, however my old version (2.8.12) running on antiquated hardware/software 
did not do this, and the AbsMax is not 100% an effective solution in my case 
since that traffic did not really exist.

I am unsure as to why this occurs, possibly because of a modification to 
accomodate 32-bit counter rollovers?  In any case, is there a modification that 
can be made to log zero to a loopped counter instead of logging a huge bandwith 

I am running RH9 with MRTG 2.9.17, and net-snmp 5.0.6.

Thanks in advance,


Unsubscribe mailto:mrtg-request at list.ee.ethz.ch?subject=unsubscribe
Archive     http://www.ee.ethz.ch/~slist/mrtg
FAQ         http://faq.mrtg.org    Homepage     http://www.mrtg.org
WebAdmin    http://www.ee.ethz.ch/~slist/lsg2.cgi

More information about the mrtg mailing list