To choose a source address you must choose an active interface with an IP Address on the device to source the flow.
Traditional Netflow example:
router1 (config)# ip flow-export source loopback0
Flexible Netflow example:
router1 (config)# flow exporter EXPORTER-1
router1 (config-flow-exporter)# loopback0
If a network engineer changes the source address, NFA will treat the new address as a separate router.
- Use the loopback address
- Don't switch source addresses if you don't want data to split over different devices.