netflow for 2 sw ports only?

I want to set up a 6509 switch to export netflow. But I only want data from the two ports that attach to my firewalls. And my collector (nfsen/ndump) distinguishes netflow sources by tcp port number. Can this be done?

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If your connection to the firewall is its own l3 network, absolutely. Just turn netflow on that vlan and send that to your aggregator. If you are talking l2 netflow, that's probably out of my expertise.

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