| Cisco Systems |
NetflowNetflowNetFlow is a protocol used to collect metadata on IP traffic flows traversing a network device.Developed by Cisco Systems, NetFlow is used to record metadata about IP traffic flows traversing a network device such as a router, switch, or host. A NetFlow-enabled device generates metadata at the interface level and sends flow data information to a flow collector, where the flow records are stored to enable network traffic analytics and management. A network operator can use NetFlow data to determine network throughput, packet loss, and traffic congestion at a specific interface level. NetFlow data also supports other network-level monitoring use cases such as DDoS detection and BGP peering. PRTG is a NetFlow collectorNetflow ConfigurationIn configuration mode issue the following to enable NetFlow Export:ip flow-export destination netflow_collector_IP_address Port ip flow-export source interface ip flow-export version 9 → (if version 9 does not take, use version 5) ip flow-cache timeout active 1 ip flow-cache timeout inactive 15 snmp-server ifindex persist Ports 2055 Enable NetFlow on each layer-3 interface you are interested in monitoring traffic for: interface ip flow ingress Example ip flow-export destination 10.100.110.69 2055 ip flow-export destination 10.100.110.69 9996 Validate configuration: LAB-R1# show ip cache flow LAB-R1# show ip flow export LAB-R1# show ip flow interface LAB-R1# show ip flow export template |