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NetFlow on a Cisco 4500 series. Do I need a NetFlow services card?

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You need to purchase and install a NetFlow services WS-4531 card to support NetFlow on 4500 series.
You cannot enable NetFlow without this card.

Update July 2010: NetFlow will be natively supported by supervisor version 7.
Also read
document On which Cisco device is netflow supported?

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