To enable netflow on the managed node:
Choose a netflow version (either 5 or 9) depending on your netflow console support. Solarwinds supports both versions
(config)# ip flow-export version 9
Send the netflow traffic to your netflow server's IP address and designated port no. VRF is optional but we use it for Out-of-band monitoring(config)# ip flow-export destination 10.10.10.10 1055 vrf vrf-name
Choose an interface that should report to the netflow server(config)# ip flow-export source interface-name
On the interfaces that you want to monitor. Add these commands at the interface level.(config-if)# ip flow ingress
(config-if)# ip flow egress
The above example is to monitor all traffic entering and leaving the interface. If you wish to monitor a specific flow, you can replace the above with Cisco Flexible Netflow (click on example). For Juniper J-flow configuration, refer to this example.