The three probes that should be avoided due to the excessive overhead and resource consumption they cause are:
NetFlow: Enabling this probe can quickly oversubscribe or overwhelm a Policy Service Node (PSN) with millions of records. It is generally not recommended for broad profiling
HTTP Span: This probe is computationally expensive and can consume a large amount of system resources on the PSN because it requires the interface to parse a multitude of potentially irrelevant traffic.
DHCP SPAN: While functional, it is not considered a best practice because it is more resource-intensive than direct methods like DHCP - IP Helper. It is rated as having a high network impact 8.
By contrast, the RADIUS probe, Device Sensor, and DHCP - IP Helper are the preferred, more efficient methods for data collection.
