I believe I may have a LAN bottleneck/congestion issue but I'm not sure exactly how to find it. I want to use a sniffer but I don't know if it will do any good with my current configuration.
I have 5 Catalyst 3548 switches in a stacked configuration that everything on my LAN connects into. In order to catch traffic with a sniffer or bandwidth monitor I am going to have to set up a SPAN port, correct?
Do I need to set up a SPAN port on each switch? Does SPAN have a big effect on traffic flowing through the switch? If I set up a SPAN port on each switch would I have to connect my sniffer to each individual SPAN port to monitor the bandwidth on that switch?
Thanks in advance for any help.