SignaMax 065-7910HPOEP, Руководство пользователя

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15 Administration
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Caution: If there is only one admin, it cannot be deleted; while if there are multiple
admins, they can be deleted but make sure there is at least one admin left.
15.10 TFTP Services
Compared with FTP, TFTP (trivial file transfer protocol) 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:
•
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.
•
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.
The TFTP service mentioned in this section refers to TFTP client function of switch.
When an SIGNAMAX POE series Ethernet industrial switch serves as a TFTP client to
download files from TFTP server and when you download a file that is larger than the free
space of the switch’s memory:
•
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 memory is found to be insufficient.
•
If the TFTP server does not support file size negotiation, the switch will receive data from
the server until the 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.
15.10.1 Update Firmware
Before performing TFTP-related configurations, you need to configure IP addresses for the
TFTP server, and specify the file name, and make sure a route exists between the two.