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CDP is a protocol that runs over Ethernet; it doesn't directly run over USB.
libpcap supports capturing raw USB traffic on several platforms; if that's what you're doing, that's probably not the best way to capture protocols running over Ethernet, such as CDP.
If your "converter" is really a USB-based Ethernet adapter, it should show up in Wireshark as an Ethernet interface. Try capturing on that rather than on a USB bus.
