Devices may sample packets to reduce the overall volume of traffic metered for flow accounting.
The collector must adjust the calculation of bytes and packets based on the sampling rate used. Usually devices will inform the collector of the sampling rate either within the flow record itself, or as option data sent periodically by the device. This setting specifies the size of the cache to be used to hold sample rate information learned from option data.
Default
32768
In some cases, a device may not transmit information about the sampling rate for which it is configured. In this case, it is possible to statically define the sampling rate in a file provided to the collector. This setting is used to enable that feature.
Valid Values
true, false
Default
false
If static sample rates are configured for devices in a file, this setting specifies the path from where that file can be loaded.
An example of the format of this file is:
Default
/etc/elastiflow/settings/sample_rate.yml
In some scenarios, it may be desired to use a user-defined sample rate rather than the rate provided by the device. Setting this option to true will check for a user-defined rate even if the device has provided a rate.
Valid Values
true, false
Default
false
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'192.0.2.1': 1024
'192.0.2.2': 512
'192.0.2.0-192.0.2.255': 256
'192.0.2.0/24': 128
# global sample rate
'0.0.0.0/0': 56