Im strying to setup SPANNING on my switch so i can use a sniffer to see whats going on, on my network. I am currently running IOS 12.1(6)ea1.
I have done as follows to enable SPAN
monitor session 1 source interface fa0/19 monitor session 1 dstination interface fa0/18
On first attempt this stopped all traffic to my PC which is also running the sniffer. After a google it appears that the 2950 will only send and receive SPAN data on the source port (bit crap really!).
I then decided to install another NIC and tried using that for the 'monitoring NIC' (which is attached to fa0/18), and the other NIC for network access (attached to fa0/17). However, as soon as I enable the 'monitoring NIC' in windows I loose all connectivity again.
Are there any fixes to address this issue? or anyone who has worked around this?