[mrtg] Re: Total Traffic per Switch

[Alex van den Bogaerdt]

Thierry Silly wrote:

> To have an idea of my backplane traffic, I add all the incoming traffic of all my ports.
> I use the estimation (I have RSM and most of my traffic pass throw it) that I need to multiply the incoming ports traffic
> by 2 to have the backplane traffic.
>      I do this using a perl script wich I run with mrtg.

I think this only works when you indeed pass all traffic through
your RSM.  Local traffic (same subnet) doesn't use the RSM and
if the in and out ports are on the same module it doesn't even
use the backplane.

> From: Sandra.Krumme at bertelsmann.de on 21.02.2001 09:19 GMT
>
> Subject:  [mrtg] Total Traffic per Switch
> 
> i am looking for a counter giving me the total traffic on a switch (Cisco
> 2924, 2926, 3548)
> insted of counters for traffic by interface.
> Is it possible to query a switch for total traffic ?

If you'd use RRDtool as back end, you're able to write a script that
uses all of the ports as input and add their traffic together. AFAIK
there is no counter on the switch (but I may be wrong!)

cheers,
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