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TFTP is slow in 3850..

I am copying IOS file to 3850 Using TFTP and it is taking long time and i tried with different TFTP servers and different operating systems.

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By default, the Catalyst 3850

By default, the Catalyst 3850 uses a tftp block size value of 512, which is the lowest possible value.  The reasoning behind this default value is to ensure interoperability with legacy tftp servers.

For IOS-XE version 3.3.2 and below, you will have to manually change the block size in the global configuration to speed up the transfer process.  The example below is a transfer comparison when using the default block size of 512K versus a transfer using the maximum block size value of 8192K.

ip tftp blocksize 8192

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