Hello all - I am running mrtg 2.15.0 on linux, monitoring various ports on a Gpbs managed switch. I've run into an issue on the uplink port, which has the most traffic. The Octet counters are not 64 bit, and with a 5-minute polling interval, it appears that multiple successive counter rollovers can happening in between mrtg runs. In other words OutOctets will roll over before a data capture, then run all the way up and roll over again *before* the next data capture, and so on - sometimes this will happen several times in succession, and the result is artificially low traffic reports on that interface. I've verified this by capturing the Octets out on that particular interface at one minute intervals to a log file - note the counter has reset by every fifth capture almost like clockwork:
1.3.6.1.2.1.2.2.1.16.24 = Counter: 275615047 1.3.6.1.2.1.2.2.1.16.24 = Counter: 1099703953 1.3.6.1.2.1.2.2.1.16.24 = Counter: 1977232053 1.3.6.1.2.1.2.2.1.16.24 = Counter: 2938038189 1.3.6.1.2.1.2.2.1.16.24 = Counter: 3871828929 1.3.6.1.2.1.2.2.1.16.24 = Counter: 425011425 1.3.6.1.2.1.2.2.1.16.24 = Counter: 1217557647 1.3.6.1.2.1.2.2.1.16.24 = Counter: 2024459227 1.3.6.1.2.1.2.2.1.16.24 = Counter: 2896359311 1.3.6.1.2.1.2.2.1.16.24 = Counter: 3803224615 1.3.6.1.2.1.2.2.1.16.24 = Counter: 384017160 1.3.6.1.2.1.2.2.1.16.24 = Counter: 1265435349 1.3.6.1.2.1.2.2.1.16.24 = Counter: 2157523201 1.3.6.1.2.1.2.2.1.16.24 = Counter: 2885065373 1.3.6.1.2.1.2.2.1.16.24 = Counter: 3742325451 1.3.6.1.2.1.2.2.1.16.24 = Counter: 210382955 I am trying a test right now in which mrtg is config'ed for the default nominal interval of 5 minutes, but I am actually capturing data every 3 minutes to avoid the successive rollovers. It seems to be working when I compare it to the data from my provider (who monitors their side of the uplink), but I suspect that this is not the proper way to handle things - is it? I realize that as traffic goes up, I'll have to increase the capture frequency further. I know the mrtg logfile contains a timestamp for each actual capture, so I guess I'm asking if my solution is 'legal'. I've been using 95.pl with mrtg and I want to continue doing this, so going to a different monitoring tool is not desired. Thanks in advance! Ed =============================================================== ::::::::::::: PREMIUM COLOCATION SERVICES ::::::::::::: =============================================================== New Media LLC [EMAIL PROTECTED] 11630 Fair Oaks Blvd., #300 http://www.servercolocation.ws Fair Oaks, CA 95628 (916) 961-0446 (866) 519-4680 Toll-Free (916) 961-0447 Fax =============================================================== -- Unsubscribe mailto:[EMAIL PROTECTED] Archive http://lists.ee.ethz.ch/mrtg FAQ http://faq.mrtg.org Homepage http://www.mrtg.org WebAdmin http://lists.ee.ethz.ch/lsg2.cgi
