The default re-probing interval was calculated considering the complexity of network topologies, number of uplinks and average time per probe to complete. It can be adjusted by administrators after running the system for at least a few days and monitoring probing performance. Beside the default re-probing period, additional prefix probing can be triggered automatically by advanced IRP algorithms or by using the VIP Improvements feature. However, probing the same destination multiple times may flag alerts for network administrators or trigger a security or rate control mechanism in those networks, which is not desirable. To avoid IRP probes resemble malicious packets, we recommend administrators to limit the number of IRP probes to a reasonable level. Without having a sensible limit on the number of probes sent, probing packets will likely start to be dropped, which will lead to inaccurate probing results. More information on IRP probing principles can be found here.