Operation Manual – FTP-SFTP-TFTPH3C S5600 Series Ethernet Switches Chapter 2 TFTP Configuration2-1Chapter 2 TFTP ConfigurationWhen configuring TFTP, go to these sections for information you are interested in:z Introduction to TFTPz TFTP Configuration2.1 Introduction to TFTPCompared with FTP, Trivial File Transfer Protocol (TFTP) features simple interactiveaccess interface and no authentication control. Therefore, TFTP is applicable in thenetworks where client-server interactions are relatively simple. TFTP is implementedbased on UDP. It transfers data through UDP port 69. Basic TFTP operations aredescribed in RFC 1986.TFTP transmission is initiated by clients, as described in the following:z To download a file, a client sends Read Request packets to the TFTP server, thenreceives data from the TFTP server, and sends acknowledgement packets to theTFTP server.z To upload a file, a client sends Write Request packets to the TFTP server, thensends data to the TFTP server, and receives acknowledgement packets from theTFTP server.An H3C S5600 series Ethernet switch can act as a TFTP client only.When an S5600 series Ethernet switch serving as a TFTP client downloads files fromthe TFTP server, the seven-segment digital LED on the front panel of the switch rotatesclockwise, and it stops rotating when the file downloading is finished, as shown inFigure 1-1.When you download a file that is larger than the free space of the switch’s flashmemory:z If the TFTP server supports file size negotiation, file size negotiation will beinitiated between the switch and the server and the file download operation will beaborted if the free space of the switch’s flash memory is found to be insufficient.z If the TFTP server does not support file size negotiation, the switch will receivedata from the server until the flash memory is full. If there is more data to bedownloaded, the switch will prompt that the space is insufficient and delete thedata partially downloaded. File download fails.TFTP-based file transmission can be performed in the following modes:z Binary mode for program file transfer.z ASCII mode for text file transfer.
