Hello Jason,
SPAN is a switch feature not supported on C7201.
However you can achieve the desired result but all the SPAN config will be on the C6509.
You need to define:
the port to which the C7201 connect as the monitor source
on a free unused where you connect the sniffer that will be your monitor session destination
Use the following link:
http://www.cisco.com/en/US/docs/switches/lan/catalyst6500/ios/12.2SX/configuration/guide/span.html
if the C7201 is not connected to the C6509 find two free ports associate them to a new L2 Vlan and connect both the C7201 and the other end (do this during a mantainance window if link is already in production)
Hope to help
Giuseppe