[mrtg] MRTG not recording data on Cisco 3560 router switch module

Alex van den Bogaerdt alex at vandenbogaerdt.nl
Tue Dec 26 17:10:09 CET 2017

> We have a Cisco 2911 router with a 3560 switch module installed. We have
> MRTG collecting utilization statistics for the router but wanted to extend
> it to the switch module, as we were interested in utilization statistics
> of a single server, connected to one of the switch ports. We ran the MRTG
> configuration commands, as we normally do, and it generated the config.
> However, when we look at the MRTG web page, the switch interfaces are
> listed but no data is being captured.
> Has anyone else run into this situation? Is there anything special we need
> to do for this type of switch?

In anticipation of a better answer, later this year or maybe even next year:

It has been a while, so memory may be vague.
If I recall correctly, *almost* no data is being captured.
The 'problem' was: once a switching decision was made, the backplane took
care of the data transfer and the switch had nothing to count anymore.

I don't remember if, and if so: how, I tackled that problem. I seem to
remember 'flows' having something to do with it.

For what it's worth/hope this helps,

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