H3C Technologies H3C S3600 Series Switches - Manual (Page 969)

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TFTP Configuration
When configuring TFTP, go to these sections for information you are interested in:
z Introduction to TFTP
z TFTP Configuration
Introduction to TFTP
Compared with FTP, Trivial File Transfer Protocol (TFTP) features simple interactive access interface
and no authentication control. Therefore, TFTP is applicable in the networks where client-server
interactions are relatively simple. TFTP is implemented based on UDP. It transfers data through UDP
port 69. Basic TFTP operations are described 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, then receives data
from the TFTP server, and sends acknowledgement packets to the TFTP server.
z To upload a file, a client sends Write Request packets to the TFTP server, then sends data to the
TFTP server, and receives acknowledgement packets from the TFTP server.
An H3C S3600 series Ethernet switch can act as a TFTP client only.
When an S3600 series Ethernet switch serving as a TFTP client downloads files from the TFTP server,
the seven-segment digital LED on the front panel of the switch rotates clockwise, and it stops rotating
when the file downloading is finished, as shown in Figure 1-1 .
When you download a file that is larger than the free space of the switch’s flash memory:
z If the TFTP server supports file size negotiation, file size negotiation will be initiated between the
switch and the server and the file download operation will be aborted 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 receive data from the server
until the flash memory is full. If there is more data to be downloaded, the switch will prompt that the
space is insufficient and delete the data 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.
Before performing TFTP-related configurations, you need to configure IP addresses for the TFTP client
and the TFTP server, and make sure a route exists between the two.