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PACKET CUT OFF BY SWTICH

Hello,

I am using K2E EVM. When I send packet out from port, last byte of packet is cut off by port. For example, prepared packet length is 60 byte and it send out as 60 byte to port . when I observe packet by WIRESHARK , some packets that are out of port are 59 byte , other packets are 60 byte.

Additional ,Especially I pay attention to Cache so  I am sure that Cache problem is not exist. 

So Could you help me why last byte of some packets are cut off by egress of switch? Or Is it switch behavior? how could I avoid or overcome this issue?

        

Thank you for your answers. 

Serdar