[mrtg] Re: traffic on cisco switch VLAN interface

Cook, Garry GWCOOK at mactec.com
Tue Dec 2 15:46:23 MET 2003

If you are looking at a multilayer switch, with one or a number of
VLANs, the traffic that you are seeing may be the first packet in each
particular flow. Once a flow is established, subsequent packets are
checked against the flow-cache and switched in hardware, so they would
not be seen by SNMP counters at layer 3.

Garry W. Cook, CCNA
Network Infrastructure Manager
MACTEC, Inc. - http://www.mactec.com/
303.308.6228 (Office) - 720.220.1862 (Mobile) 

> What does the traffic on vlan interface shown by mrtg on 
> cisco switches means? Since VLAN is only a logical interface, 
> it should not have any traffic on it.

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