Assuming polls are successful, NFA will SNMP poll a router under these conditions:
- The Harvester hasn’t seen flows from the router before (in other words, a newly added router)
- The Harvester sees a flow from an interface that it has not previously seen (such as when a new interface is added to the router)
- The router has rebooted (according to SysUpTime)
- Every 24 hours after the last poll
If polls for a router are unsuccessful, NFA will wait longer and longer between each successive poll.
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