H3C S5500-SI Series, Operation Manual

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If the IP address and the domain name of the TFTP server are not contained in the DHCP response
or they are illegitimate, the device broadcasts a TFTP request to the TFTP server.
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When broadcasting a TFTP request, the device obtains the configuration file from the TFTP server
who responds the first. If the required configuration file does not exist on the TFTP server, then
obtaining the configuration file fails, and the device removes the temporary configuration and starts
up without loading the configuration file.
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When the device broadcasts a TFTP request to the TFTP server, you need to configure the UDP
Helper function on a gateway to transfer broadcasts to unicasts and forwards the unicasts to the
specified TFTP server if the device performs the automatic configuration and the TFTP server are
not in the same segment because broadcasts can only be transmitted in a segment. For the
detailed description of the UDP Helper function, refer to UDP Helper Configuration in the IP
Services Volume .
Executing the Configuration File
Upon successfully obtaining the configuration file, the device removes the temporary configuration and
executes the obtained configuration file; otherwise, it removes the temporary configuration and starts up
without loading the configuration file.
After the device executes the configuration file obtained, the configuration file will be deleted. Therefore,
you are recommended to save the configuration using the save command; otherwise, the device needs
to perform the automatic configuration function after system reboot. For the detailed description of the
save command, refer to File System Management Configuration in the System Volume .