centos - MRTG Graph and Bandwidth more than > 120 Mbps -

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h i,

I'm experiencing with MRTG .. bandwidth is not bigger at 120 Mbps , MRTG will not display it correctly / the speed of my server 1 GB port, and I am downloading and uploading at this speed, but the MRT graph is not covering more than 120m traffic
do anybody Have this experience done? Can anyone help?

Thanks.

This is a common problem due to a 16-bit counter rollover.

If you are voting on your device using every 5min (default) SNMPv1, traffic over 120Mbps will cause this to wrap the 16-bit counter in the window at this time. Therefore, MRTG shows only low traffic because it can not tell how often the counter will rotate.

You have two options:

  1. Use SNMPv2 This is the best option, if your device supports it (mostly). If using SNMPv2, you can use the 64 bit counter, which will not wrap around. To do this, add '::::: 2' as a suffix in your target definition to specify SNMPv2. Eg:

target [ezwf]: 1: community @ router ::::: 2

  1. Increasing the frequency of voting You can change your voting by using 'Interval: 1' every 1 minute, which increases your ability by 5 factors. However, note that you will need to delete and recreate your old rrd or log file; You will need to deal with any changes in your scheduling method, and all targets will use the same voting frequency.

The MRTG document is available and SNMPv2c covers the target syntax as well as changes in intervals.


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