3com 5500-SI Manual De Usuario

TFTP Overview 449

3 Run FTP client on the PC and establish FTP connection. Upload the 

 to the 

Switch under the Flash directory and download the 

 from the Switch. FTP 

client is not shipped with the Switch, so you need to buy it separately. 

4 When the uploading is completed, initiate the file upgrade on the Switch.

<SW5500>

Use the 

command to specify the downloaded program as the 

application at the next login and reboot the Switch. 

<SW5500> boot boot-loader switch.app

<SW5500> reboot

Trivial File Transfer Protocol (TFTP) is a simple protocol for file transmission. Compared 
with FTP, another file transmission protocol, TFTP has no complicated interactive 
access interface or authentication control, and therefore it can be used when there is 
no complicated interaction between the clients and server. TFTP is implemented on 
the basis of UDP.

TFTP transmission is originated from the client end. To download a file, the client 
sends a request to the TFTP server and then receives data from it and sends an 
acknowledgement to it. To upload a file, the client sends a request to the TFTP server 
and then transmits data to it and receives the acknowledgement from it. TFTP 
transmits files in two modes: binary mode for program files and ASCII mode for text 
files. 

Figure 115   TFTP Configuration

Table 494   Configuration of the Switch as TFTP Client

Switch

Configure IP address for the 
VLAN interface of the 
Switch, in the same network 
segment as that of TFTP 
server. 

-

TFTP is right for the case where no 
complicated interactions are required 
between the client and server. Make sure 
that the IP address of the VLAN interface on 
the Switch is in the same network segment as 
that of the TFTP server.

Use the tftp command to 
log into the remote TFTP 
server for file uploading and 
downloading. 

-

-

PC

Start TFTP server and set 
authorized TFTP directory. 

-

-

Switch

PC

Network

Switch

Switch

PC

Network