Situation: We have a 3750 with a monitoring session setup on it, grabs a few VLAN's running over the switch and has a destination port on that device (normal SPAN not RSPAN). Historically speaking - that destination port had a 1GB cable plugged into it connecting down to a 3020 (in the back of an HP blade chassis), and hosts in that chassis could be set with a promiscuous NIC to monitor the network.
The 3020 has lost it's config. How do I set up the port on the 3020 to pass the SPAN traffic? Very curious about this because I had thought RSPAN was needed for a setup like this, but it's worked for years in the manner described above with regular SPAN.