The Cisco WS-F4531 NetFlow Services daughter card adds NetFlow accounting to the Catalyst 4500 series. NetFlow accounting collects statistics on a per-flow basis. A flow is defined as a source IP address, destination IP address, IP protocol type, source Layer 4 port, and destination Layer 4 port. Without the NetFlow Services Card, the Supervisor Engine IV on the Catalyst 4500 does not support NetFlow accounting.
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