I also had problems with spikes in my graphs. These spikes didn't necessarily occurred when the counters where cleared but also when a router couldn't be reached for a wile. When the connection came back a spike was visible. It seemed like wile there was no management connection with the router the counters kept counting. When the management connection came back the difference between the last known counter and the new counter was calculated as displayed as the value for the period of now and 5 min ago in stead of now and the last time there was a management connection.
I fixed this problem using interface descriptions in stead of index numbers to identify the interfaces. If anyone thinks my reasoning above is false please notify my. Gr, Sander Foppen -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Scott P. Daffron Sent: vrijdag 24 januari 2003 17:26 To: [EMAIL PROTECTED] Subject: [mrtg] clearing of counters on Cisco Oh most wise MRTG gurus, We have noticed that our version of MRTG (a couple years old) shows a huge spike on our Cisco interface graphs whenever a "clear counters" is done on the device. This is becoming a big problem for us, as we have just implemented a new NMS which clears all counters once per day. I know this is an issue of the OID counter wrapping, leading MRTG to think that a massive bandwidth spike has indeed occurred, but is there a way to configure MRTG not to draw this conclusion (and alleviate all of the massive spikes in our graphs)? Does a newer version of MRTG handle this differently? I have looked high and low, but can't seem to find an answer on this. Thanks in advance... Scott Daffron Network Engineer Sentara Health Care -- Unsubscribe mailto:[EMAIL PROTECTED] 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 -- Unsubscribe mailto:[EMAIL PROTECTED] 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
