Hello,
on C2950 that is an older platform you need to configure a reflector port (first generation of remote span)
see
http://www.cisco.com/en/US/docs/switches/lan/catalyst2950/software/release/12.1_22_ea11x/configuration/guide/swspan.html#wp1415189
the refllector port cannot be used for other purposes
Hope to help
Giuseppe
