On 10 Jan 2017, at 23:04, Satish Patel wrote:
How people decide what sample rate is appropriate for them what is the criteria to decide?
It's a combination of aggregate bps/pps rates on the interface of the router(s) exporting flow telemetry, how flow-generation impacts their linecards/platforms, how much DCN/OoB backhaul capacity they have (you aren't exporting it in the production data plane of your network, right?), and the flows/sec capacity of their collection/analysis system.
~30 records per exported 1500-byte flow telemetry packet is an important number to keep in mind.
The idea is to keep the sampling ratio as low (e.g., 1:100 is a *lower* sampling ratio than 1:1000) as practicable, given a reasonable balance of the factors noted above.
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