Re: sflow issue observed with lower MTU - EX4300 virtual-chassis
a month ago
For QFX series, Regardless of the rate of traffic or the configured sampling interval, a datagram is sent whenever its size reaches the maximum Ethernet transmission unit (MTU) of 1500 bytes, or whenever a 250-ms timer expires, whichever occurs first. The timer ensures that a collector receives regularly sampled data.
so sending sflow packet will be when 1500 bytes of flows and counters are packed or every 250ms , In case the traffic is really slow and the configured polling interval/sampling rate is really large, then the rate at which flow samples are generated might not fill up the max datagram size in time. you can try manipulate polling interval / sampling rate as delay in sending of samples might render them useless to the collector .
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