I'm trying to configure SPAN on my Cisco Catalyst 3560 in order to be able to mirror traffic from one port to another.
To summarize, the mirroring is not working. I'm able to test if SPAN is working by checking the traffic on the network cards and by trying our monitoring software (Websense) which is supposed to work if SPAN is operational.
Please find attached the important parts of the configuration.
PS - The monitoring software worked just fine when I replaced the switch with a dumb hub, so I figured out that the problem is definitely originating from the Cisco and its SPAN configuration.
Please note that the setup of the network cards is correct, but the interesting thing is that even though the configuration of SPAN is done on the FastEthernet interfaces, the network cards which are connected to ports 36 and 46 are both showing a speed of 1Gbps under the network connection properties. I'm not sure if that could be a part of the problem.
I tried to manually set the network cards to operate at 100Mbps or 10Mbps but that didn't work for me also.
Another interesting point: On another Cisco switch in a different office, I went through the same configuration and SPAN worked just fine and the network cards were showing a speed of 100Mbps.
I would really appreciate your help.
Thank you in advance.
Your logs and outputs do not indicate a problem on the switch side. Also you have observed the same configuration on a different site which have worked.
It seems like a problem with the NICs. Did you try to use the latest drivers for the NICs? Are those the same NICs that you have successfully configured span session on a different site? If you do use the same cards and latest software , I recommend replacing the NICs or opening a case to the manufacturer of the NICs.