Websense documentation mentions that only one port needs to be used on their appliance if the premise switch supports bidirectional spanning. That way monitoring and blocking can both be done on the same interface.
Are there switches that allow a port to be the destination port of a span/mirror and still send/xmit data?
I don't think Cisco will but I have found conflicting statements on the web:
"The Catalyst 2950 and 3550 Switches can forward traffic on a destination SPAN port in Cisco IOS Software Release 12.1(13)EA1 and later."
"When you configure a switch port as a SPAN destination port, it is no longer a normal switch port; only monitored traffic passes through the SPAN destination port. "
If Cisco does not support this feature are there any other brands that do?