Utility Commands
427
M4100 Series ProSAFE Managed Switches
sflow sampler
A data source configured to collect flow samples is called a poller. Use this command to
configure a new sFlow sampler instance for this data source if <rcvr-idx> is valid.
no sflow sampler
Use this command to reset the sFlow sampler instance to the default settings.
Format sflow sampler {<rcvr-indx> | rate <sampling-rate> | maxheadersize
<size>}
Mode Interface Config
Field Description
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.
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
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.
Format no sflow sampler {<rcvr-indx> | rate <sampling-rate> | maxheadersize
<size>}
Mode Interface Config
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