Netgear M5300-52G3 (GSM7352Sv2h2) - ProSAFE 48 ports managed L3 gigabit stackable switch Software Guide

A data source configured to collect flow samples is called a poller. Use this command to 

configure a new sFlow sampler instance on an interface or range of interfaces for this data 
source if rcvr_indx is valid.

index

Receiver index identifier. The range is 1 to 8.

Receiver Owner

The owner name corresponds to the receiver name. The identity string for the receiver, the entity 
making use of this sFlowRcvrTable entry. The range is 127 characters. The default is a null string. 
The empty string indicates that the entry is currently unclaimed and the receiver configuration is 
reset to the default values. An entity wishing to claim an sFlowRcvrTable entry must ensure that the 
entry is unclaimed before trying to claim it. The entry is claimed by setting the owner string to a 
non-null value. The entry must be claimed before assigning a receiver to a sampler or poller.

Format

sflow sampler {rcvr-indx | rate sampling-rate | maxheadersize size}

Mode

Interface Config

Receiver Index

The sFlow Receiver for this sFlow sampler to which flow samples are to be sent. A value of zero (0) 
means that no receiver is configured, no packets will be sampled. Only active receivers can be set. If 
a receiver expires, then all samplers associated with the receiver will also expire. Possible values 
are 1-8. The default is 0.

Maxheadersize

The maximum number of bytes that should be copied from the sampler packet. The range is 20-256. 
The default is 128. When set to zero (0), all the sampler parameters are set to their corresponding 
default value.

Sampling Rate

The statistical sampling rate for packet sampling from this source. A value of zero (0) disables 
sampling. A value of N means that out of N incoming packets, 1 packet will be sampled. The range is 
1024-65536 and 0. The default is 0.

When you issue a show command for the sampling rate, the configured sampling rate on an 
interface changes. Each time that you configure a sampling rate, a threshold value is calculated. 
This threshold value is configured in the hardware register. When you issue a show command for 
the sampling rate, the threshold value is queried from the hardware and the sampling rate is 
calculated in the following way:

threshold value = 2^24/ (sampling rate)

Because only an integer operation is supported, the sampling rate is not the same as the configured 
value.

The following is an example:

configured sampling rate is 60000

threshold value = 2^24/ (60000) = 279 (from integer division)

recalculated sampling rate = 2^24/ (279) = 60133