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  1. I have recently upgraded a graph from 32 bit to 64 bit counters, and am now getting unexpected (and I think incorrect) spikes in the graphs. All ideas welcome. I have a network with multiple VLANs. A layer3 wirespeed switch (an old 3Com Coebuilder 3500) is attached with a single Gigabit interface. Traffic from the backbone concentrator runs out to the switch, changes VLAN and is forwarded to the destination, Therefore Inbound equals outbound. I was measuring this using standard 32 bit counters. This showed traffic at 50 Mb or so. I wondered whether this was correct, or whether the counter was wrapping. So I upgraded to 64 bit counters (I had to use OIDs, as :::::2 does not work) The new graph shows the same basic data level, but also has 100Mb spikes, with the traffic shown in only one direction at a time. This seems wrong, teh network design should not have a massive imbalence. I am using MRTG 2.9.22 with RRD, running on w2k workstation (SP3), at 5 min intervals, and viewed through Routers2.cgi. The config contains: Unscaled[_]: d Options[_]: bits, growright, nopercent routers.cgi*Options[_]: nomax interface MaxBytes[_]: 250000 AbsMax[_]: 125000000 Target[wdh3500_1]: ifHCInOctets.1&ifHCOutOctets.1:public@3500-1 I have fired up STG (from http://leonidvm.chat.ru) on my desktop, set to 5 second polling. One STG session is monitoring ifInOctets&ifOutOctets, and another session measuring ifHCInOctets&ifHCOutOctets. The attached graph shows the MRTG traffic graph, and the two STG graphs. Neither STG graph has a spike, but MRTG does. Where is it coming from? (See attached file: Spike.jpg) Any pointers/suggestions/solutions appreciated Regards Peter Glanville Network Analyst, ICtS, Canon (UK) Ltd "This email may contain confidential information which is intended for the required recipient only. If you are not the named recipient you should not take any action in relation to this email, other than to notify us that you have received it in error. If this email contains attachments you should ensure they are checked for viruses before opening them." -- Attached file removed by Ecartis and put at URL below -- -- Type: image/jpeg -- Size: 125k (128468 bytes) -- URL : http://www.ee.ethz.ch/~slist/p/Spike.jpg --

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