Cisco NetFlow is a network monitoring and traffic analysis technology developed by Cisco Systems, a leading provider of networking equipment and solutions. NetFlow allows network administrators to collect and analyse data about the traffic flowing through a Cisco router or switch. It provides valuable insights into network traffic patterns, helping organizations optimize network performance, troubleshoot issues, and enhance security. NetFlow allows network administrators to collect and analyse data about the traffic flowing through a Cisco router or switch. It provides valuable insights into network traffic patterns, helping organizations optimize network performance, troubleshoot issues, and enhance security.

Configuration:

ip flow ingress

Enable inbound NetFlow

ip flow egress

Enable outbound NetFlow

ip flow-export version 9

This command specifies that you want to use NetFlow version 9 for exporting flow data.

ip flow-export destination 

Set the IP address and port number of the NetFlow collector where the router will send flow records.

ip flow-cache timeout active 1

This command sets the active flow timeout to 1 minute. Adjust this value as needed.

Verification:

show ip cache flow

show ip flow interface

show ip flow export

show flow record