[mrtg] Re: How to measure VLAN Traffic with MRTG ?
eric_mailing_list at rednarb.com
Tue Sep 6 15:36:51 MEST 2005
>Does a Switch store some VLAN Information like Traffic/Bandwidth etc in
>a special part of the MIB? If so, i could directly read out these values
>and display it without having problems when the configuration of the
>(I know that the Cisco Switches produces an "interface - entry" for
>every VLAN, but i did not find something about the Traffic)
When I run cfgmaker on my 4006 with Sup3 (for layer-3 switching) it also
gives me each vlan as an interface. Its a little misleading however,
since that only reports information that traverses the vlan border, not
that which stays within the vlan. So if traffic goes from machine A on
vlan1 to machine B on vlan1, nothing will be seen of this traffic on the
vlan graph. But if machine B talks to machine C on vlan2, you'll see
that traffic on both vlan1's and vlan2's graphs.
As for aggregating the total traffic within an entire vlan, I've found
no way other than adding interfaces together.
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