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Rasika, yes I saw your later posting with the USB results. Certainly quite a difference! Assuming there's not something wrong with the 3850 (considering how new they still are, that might be a possibility), the only other usual causes for slow TFTP transfers are latency (as TFTP usually only sends one packet per ACK) or high loss/drop rate.
If the TFTP server is directly connected to the 3850, you're 100% positive interface shows no errors and both sides are in agreement about duplex?
Have your tried any other TFTP servers (several free ones are available for PCs) or a FTP server; just to see if you obtain the same results?
[edit]
PS:
Laugh - should have read more of the new postings - you have done additional testing - also like Leo, again, there might be something wrong (i.e. possible bug).
PPS:
Oh, and if you want to try another test, assuming you have enough flash to hold two copies of the file, you can copy the file from flash to flash using a different name.
[edit2]
Is there drastic differences the way wrting to flash via TFTP & via locally attached USB ?
There can be, as the network is eliminated as a factor. But for a TFTP server locally attached, wouldn't expect a significant difference.
