never worked with Dell switches, but you should be able to see all traffic from the source port on the destination port if SPAN is correctly configured. check the Dell manual on the web - there are a lot of restrictions for monitoring on Dell switches
http://support.dell.com/support/edocs/network/pc33xx/en/CLI/J0926a00/portmoni.htm#1017474
I put that link on a new page for Dell switches:
http://wiki.ethereal.com/SwitchReference_2fDell
under the "switch reference" page:
http://wiki.ethereal.com/SwitchReference
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