Edge-Core ES4626 User Manual page 92

TFTP builds upon UDP, providing unreliable data stream transfer service with no
user authentication or permission-based file access authorization. It ensures correct data
transmission by sending and acknowledging mechanism and retransmission of time-out
packets. The advantage of TFTP over FTP is that it is a simple and low overhead file
transfer service.
ES4626/ES4650 switch can operate as either FTP/TFTP client or server. When
ES4626/ES4650 switch operates as a FTP/TFTP client, configuration files or system files
can be downloaded from the remote FTP/TFTP servers(can be hosts or other switches)
without affecting its normal operation. And file list can also be retrieved from the server in
ftp client mode. Of course, ES4626/ES4650 switch can also upload current configuration
files or system files to the remote FTP/TFTP servers(can be hosts or other switches).
When ES4626/ES4650 switch operates as a FTP/TFTP server, it can provide file upload
and download service for authorized FTP/TFTP clients, as file list service as FTP server.
Here are some terms frequently used in FTP/TFTP.
ROM: Short for EPROM, erasable read-only memory. EPROM is repalced by FLASH
memory in ES4626/ES4650 switch.
SDRAM: RAM memory in the switch, used for system software operation and
configuration sequence storage.
FLASH: Flash memory used to save system file and configuration file
System file: including system image file and boot file.
System image file: refers to the compressed file for switch hardware driver and software
support program, usually refer to as IMAGE upgrade file. In ES4626/ES4650 switch, the
system image file is allowed to save in FLASH only. ES4626/ES4650 switch mandates
the name of system image file to be uploaded via FTP in Global Mode to be nos.img,
other IMAGE system files will be rejected.
Boot file: refers to the file initializes the switch, also referred to as the ROM upgrade file
(Large size file can be compressed as IMAGE file). In ES4626/ES4650 switch, the boot
file is allowed to save in ROM only. ES4626/ES4650 switch mandates the name of the
boot file to be boot.rom.
Configuration file: including start up configuration file and running configuration file. The
distinction between start up configuration file and running configuration file can facilitate
the backup and update of the configurations.
Start up configuration file: refers to the configuration sequence used in switch start up.
ES4626/ES4650 switch start up configuration file stores in FLASH only, corresponding to
the so called configuration save. To prevent illicit file upload and easier configuration,
ES4626/ES4650 switch mandates the name of start up configuration file to be
startup-config.
Running configuration file: refers to the running configuration sequence use in the
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