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SPAN Trunk on Catalyst 2960

We have a few Catalyst 2960 switches, and potentially a few 2950 switches, that I would like to port mirror/SPAN the trunk ports on. We'd be hooking up a desktop running wireshark to capture packets.

What is the proper procedure to port mirroring a trunk port, or is it only possible to port mirror a single/group of access ports?
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Thanks.

Did either of you go for any specific NIC that can handle tagging within Wireshark? Any gotcha's in terms of choices of NICs?
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