Table of Contents

Chapter 1 FTP and SFTP Configuration. 1-1

1.1 Introduction to FTP and SFTP. 1-1

1.1.1 Introduction to FTP. 1-1

1.1.2 Introduction to SFTP. 1-1

1.2 FTP Configuration. 1-2

1.2.1 FTP Configuration: A Switch Operating as an FTP Server 1-2

1.2.2 FTP Configuration: A Switch Operating as an FTP Client 1-6

1.2.3 Configuration Example: A Switch Operating as an FTP Server 1-7

1.2.4 FTP Banner Display Configuration Example. 1-10

1.2.5 FTP Configuration: A Switch Operating as an FTP Client 1-11

1.3 SFTP Configuration. 1-13

1.3.1 SFTP Configuration: A Switch Operating as an SFTP Server 1-13

1.3.2 SFTP Configuration: A Switch Operating as an SFTP Client 1-15

1.3.3 SFTP Configuration Example. 1-17

Chapter 2 TFTP Configuration. 2-1

2.1 Introduction to TFTP. 2-1

2.2 TFTP Configuration. 2-2

2.2.1 TFTP Configuration: A Switch Operating as a TFTP Client 2-2

2.2.2 TFTP Configuration Example. 2-2

 

Chapter 1  FTP and SFTP Configuration

1.1  Introduction to FTP and SFTP

1.1.1  Introduction to FTP

FTP (file transfer protocol) is commonly used in IP-based networks to transmit files. Before World Wide Web comes into being, files are transferred through command lines, and the most popular application is FTP. At present, although E-mail and Web are the usual methods for file transmission, FTP still has its strongholds.

As an application layer protocol, FTP is used for file transfer between remote server and local client. FTP uses TCP ports 20 and 21 for data transfer and control command transfer respectively. Basic FTP operations are described in RFC 959.

FTP-based file transmission is performed in the following two modes:

l           Binary mode for program file transfer

l           ASCII mode for text file transfer

An H3C S3100 series Ethernet switch can act as an FTP client or the FTP server in FTP-employed data transmission:

Table 1-1 Roles that an H3C S3100 series Ethernet switch acts as in FTP

Item	Description	Remarks
FTP server	An Ethernet switch can operate as an FTP server to provide file transmission services for FTP clients. You can log in to a switch operating as an FTP server by running an FTP client program on your PC to access files on the FTP server.	The prerequisite is that a route exists between the switch and the PC.
FTP client	In this case, you need to establish a connection between your PC and the switch through a terminal emulation program or Telnet, execute the ftp X.X.X.X command on your PC. (X.X.X.X is the IP address of an FTP server or a host name), and enter your user name and password in turn. A switch can operate as an FTP client, through which you can access files on the FTP server.

 

1.1.2  Introduction to SFTP

Secure FTP (SFTP) is established based on an SSH2 connection. It allows a remote user to log in to a switch to manage and transmit files, providing a securer guarantee for data transmission. In addition, since the switch can be used as a client, you can log in to remote devices to transfer files securely.

1.2  FTP Configuration

Table 1-2 FTP configuration tasks

Item	Configuration task	Description
FTP Configuration: A Switch Operating as an FTP Server	Creating an FTP user	Required
	Enabling an FTP server	Required
	Configuring connection idle time	Optional
	Configuring the banner for an FTP server	Optional
	Displaying FTP server information	Optional
FTP Configuration: A Switch Operating as an FTP Client	Basic configurations on an FTP client	—

 

1.2.1  FTP Configuration: A Switch Operating as an FTP Server

I. Creating an FTP user

Configure the user name and password for the FTP user and set the service type to FTP. To use FTP services, a user must provide a user name and password for being authenticated by the FTP server. Only users that pass the authentication have access to the FTP server.

Table 1-3 Create an FTP user

Operation	Command	Description
Enter system view	system-view	—
Add a local user and enter local user view	local-user user-name	Required By default, no local user is configured.
Configure a password for the specified user	password { simple | cipher } password	Optional By default, no password is configured.
Configure the service type as FTP	service-type ftp	Required By default, no service is configured.

 

II. Enabling an FTP server

Table 1-4 Enable an FTP server

Operation	Command	Description
Enter system view	system-view	—
Enable the FTP server function	ftp server enable	Required Disabled by default.

 

 

 

III. Configuring connection idle time

After the idle time is configured, if the server does not receive service requests from a client within a specified time period, it terminates the connection with the client, thus preventing a user from occupying the connection for a long time without performing any operation.

Table 1-5 Configure connection idle time

Operation	Command	Description
Enter system view	system-view	—
Configure the connection idle time for the FTP server	ftp timeout minutes	Optional 30 minutes by default

 

IV. Disconnecting a specified user

On the FTP server, you can disconnect a specified user from the FTP server to secure the network.

Table 1-6 Disconnect a specified user

Operation	Command	Description
Enter system view	system-view	—
On the FTP server, disconnect a specified user from the FTP server	ftp disconnect user-name	Required

 

 

V. Configuring the banner for an FTP server

Displaying a banner: With a banner configured on the FTP server, when you access the FTP server through FTP, the configured banner is displayed on the FTP client. Banner falls into the following two types:

l           Login banner: After the connection between an FTP client and an FTP server is established, the FTP server outputs the configured login banner to the FTP client terminal.

Figure 1-1 Process of displaying a login banner

l           Shell banner: After the connection between an FTP client and an FTP server is established and correct user name and password are provided, the FTP server outputs the configured shell banner to the FTP client terminal.

Figure 1-2 Process of displaying a shell banner

Table 1-7 Configure the banner display for an FTP server

Operation	Command	Description
Enter system view	system-view	—
Configure a login banner	header login text	Required Use either command or both. By default, no banner is configured.
Configure a shell banner	header shell text

 

 

VI. Displaying FTP server information

After the above configurations, you can execute the display commands in any view to display the running status of the FTP server and verify your configurations.

Table 1-8 Display FTP server information

Operation	Command	Description
Display the information about FTP server configurations on a switch	display ftp-server	Available in any view
Display the login FTP client on an FTP server	display ftp-user

 

1.2.2  FTP Configuration: A Switch Operating as an FTP Client

I. Basic configurations on an FTP client

By default a switch can operate as an FTP client  In this case you can connect the switch to the FTP server to perform FTP-related operations (such as creating/removing a directory) by executing commands on the switch. Table 1-9 lists the operations that can be performed on an FTP client.

Table 1-9 Basic configurations on an FTP client

Operation	Command	Description
Enter FTP client view	ftp [ cluster | remote-server [ port-number ] ]	—
Specify to transfer files in ASCII characters	ascii	Use either command By default, files are transferred in ASCII characters.
Specify to transfer files in binary streams	binary
Set the data transfer mode to passive	passive	Optional passive by default.
Change the working directory on the remote FTP server	cd pathname	Optional
Change the working directory to be the parent directory	cdup
Get the local working path on the FTP client	lcd
Display the working directory on the FTP server	pwd
Create a directory on the remote FTP server	mkdir pathname
Remove a directory on the remote FTP server	rmdir pathname
Delete a specified file	delete remotefile
Query a specified file on the FTP server	dir [ remotefile ] [ localfile ]	Optional If no file name is specified, all the files in the current directory are displayed. The difference between these two commands is that the dir command can display the file name, directory as well as file attributes; while the Is command can display only the file name and directory.
	ls [ remotefile ] [ localfile ]
Download a remote file from the FTP server	get remotefile [ localfile ]	Optional
Upload a local file to the remote FTP server	put localfile [ remotefile ]
Rename a file on the remote server	rename remote-source remote-dest
Log in with the specified user name and password	user username [ password ]
Connect to a remote FTP server	open { ip-address | server-name } [ port ]
Terminate the current FTP connection without exiting FTP client view	disconnect
	close
Terminate the current FTP connection and return to user view	quit
	bye
Display the online help about a specified command concerning FTP	remotehelp [ protocol-command ]
Enable the verbose function	verbose	Optional Enabled by default

 

1.2.3  Configuration Example: A Switch Operating as an FTP Server

I. Network requirements

A switch operates as an FTP server and a remote PC as an FTP client. The application switch.bin of the switch is stored on the PC. Upload the application to the remote switch through FTP and use the boot boot-loader command to specify switch.bin as the application for next startup. Reboot the switch to upgrade the switch application and download the configuration file config.cfg from the switch, thus to back up the configuration file.

l           Create a user account on the FTP server with the user name “switch” and password “hello”.

l           The IP addresses 1.1.1.1 for a VLAN interface on the switch and 2.2.2.2 for the PC have been configured. Ensure that a route exists between the switch and the PC.

II. Network diagram

Figure 1-3 Network diagram for FTP configurations: a switch operating as an FTP server

III. Configuration procedure

1)         Configure Switch A (the FTP server)

# Log in to the switch and enable the FTP server function on the switch. Configure the user name and password used to access FTP services, and specify the service type as FTP (You can log in to a switch through the Console port or by telnetting the switch. See the “Login” module for detailed information.)

# Configure the FTP user name as “switch”, the password as “hello”, and the service type as FTP.

<Sysname>

<Sysname> system-view

[Sysname] ftp server enable

[Sysname] local-user switch

[Sysname-luser-switch] password simple hello

[Sysname-luser-switch] service-type ftp

2)         Configure the PC (FTP client)

Run an FTP client application on the PC to connect to the FTP server. Upload the application named switch.bin to the root directory of the Flash memory of the FTP server, and download the configuration file named config.cfg from the FTP server. The following takes the command line window tool provided by Windows as an example:

# Enter the command line window and switch to the directory where the file switch.bin is located. In this example it is in the root directory of C:\.

C:\>

# Access the Ethernet switch through FTP. Input the user name “switch” and password “hello” to log in and enter FTP view.

C:\> ftp 1.1.1.1

Connected to 1.1.1.1.

220 FTP service ready.

User (1.1.1.1:(none)): switch

331 Password required for switch.

Password:

230 User logged in.

ftp>

# Upload the switch.bin file.

ftp> put switch.bin

200 Port command okay.

150 Opening ASCII mode data connection for switch.bin.

226 Transfer complete.

ftp: 75980 bytes received in 5.55 seconds 13.70Kbytes/sec.

# Download the config.cfg file.

ftp> get config.cfg

200 Port command okay.

150 Opening ASCII mode data connection for config.cfg.

226 Transfer complete.

ftp: 3980 bytes received in 8.277 seconds 0.48Kbytes/sec.

This example uses the command line window tool provided by Windows. When you log in to the FTP server through another FTP client, refer to the corresponding instructions for operation description.

 

 

3)         Configure Switch A (FTP server)

# After uploading the application, use the boot boot-loader command to specify the uploaded file (switch.bin) to be the startup file used when the switch starts the next time, and restart the switch. Thus the switch application is upgraded.

<Sysname> boot boot-loader switch.bin

<Sysname> reboot

 

 

1.2.4  FTP Banner Display Configuration Example

I. Network requirements

Configure the Ethernet switch as an FTP server and the remote PC as an FTP client. After a connection between the FTP client and the FTP server is established and login succeeds, the banner is displayed on the FTP client.

l           An FTP user named “switch” and the password “hello” have been configured on the FTP server.

l            The IP addresses 1.1.1.1 for a VLAN interface on the switch and 2.2.2.2 for the PC have been configured. Ensure that a route exists between the switch and the PC.

l           Configure the login banner of the switch as “login banner appears” and the shell banner as “shell banner appears”.

II. Network diagram

Figure 1-4 Network diagram for FTP banner display configuration

III. Configuration procedure

1)         Configure the switch (FTP server)

# Configure the login banner of the switch as “login banner appears” and the shell banner as “shell banner appears”. For detailed configuration of other network requirements, see section 1.2.3  Configuration Example: A Switch Operating as an FTP Server.

<Sysname> system-view

[Sysname] header login %login banner appears%

[Sysname] header shell %shell banner appears%

2)         Configure the PC (FTP client)

# Access the Ethernet switch through FTP. Enter the user name “switch“ and the password “hello” to log in to the switch, and then enter FTP view. Login banner appears after FTP connection is established. Shell banner appears after the user passes the authentication.

C:\> ftp 1.1.1.1

Connected to 1.1.1.1.

220-login banner appears

220 FTP service ready.

User (1.1.1.1:(none)): switch

331 Password required for switch.

Password:

230-shell banner appears

230 User logged in.

ftp>

1.2.5  FTP Configuration: A Switch Operating as an FTP Client

I. Network requirements

A switch operates as an FTP client and a remote PC as an FTP server. The switch application named switch.bin is stored on the PC. Download it to the switch through FTP and use the boot boot-loader command to specify switch.bin as the application for next startup. Reboot the switch to upgrade the switch application, and then upload the switch configuration file named config.cfg to the “switch” directory of the PC to back up the configuration file.

l           Create a user account on the FTP server with the user name “switch” and password “hello”, and grant the user “switch” read and write permissions for the directory named “Switch” on the PC.

l           Configure the IP address 1.1.1.1 for a VLAN interface on the switch, and 2.2.2.2 for the PC. Ensure a route exists between the switch and the PC.

II. Network diagram

Figure 1-5 Network diagram for FTP configurations: a switch operating as an FTP client

III. Configuration procedure

1)         Configure the PC (FTP server)

Perform FTP server–related configurations on the PC, that is, create a user account on the FTP server with user name “switch” and password “hello”. (For detailed configuration, refer to the configuration instruction relevant to the FTP server software.)

2)         Configure the switch (FTP client)

# Log in to the switch. (You can log in to a switch through the Console port or by telnetting the switch. See the “Login” module for detailed information.)

 

 

# Connect to the FTP server using the ftp command in user view. You need to provide the IP address of the FTP server, the user name and the password as well to enter FTP view.

<Sysname> ftp 2.2.2.2

Trying ...

Press CTRL+K to abort

Connected.

220 FTP service ready.

User(none):switch

331 Password required for switch.

Password:

230 User logged in.

[ftp]

# Enter the authorized directory on the FTP server.

[ftp] cd switch

# Execute the put command to upload the configuration file named config.cfg to the FTP server.

[ftp] put config.cfg

# Execute the get command to download the file named switch.bin to the Flash memory of the switch.

[ftp] get switch.bin

# Execute the quit command to terminate the FTP connection and return to user view.

[ftp] quit

<Sysname>

# After downloading the file, use the boot boot-loader command to specify the downloaded file (switch.bin) to be the application for next startup, and then restart the switch. Thus the switch application is upgraded.

<Sysname> boot boot-loader switch.bin

<Sysname> reboot

 

 

1.3  SFTP Configuration

Table 1-10 SFTP configuration tasks

Item	Configuration task	Description
SFTP Configuration: A Switch Operating as an SFTP Server	Enabling an SFTP server	Required
	Configuring connection idle time	Optional
	Supported SFTP client software	—
SFTP Configuration: A Switch Operating as an SFTP Client	Basic configurations on an SFTP client	—

 

1.3.1  SFTP Configuration: A Switch Operating as an SFTP Server

I. Enabling an SFTP server

Before enabling an SFTP server, you need to enable the SSH server function and specify the service type of the SSH user as SFTP or all. For details, see the SSH server configuration part of SSH Operation Manual of this manual.

Table 1-11 Enable an SFTP server

Operation	Command	Description
Enter system view	system-view	—
Enable an SFTP server	sftp server enable	Required Disabled by default

 

II. Configuring connection idle time

After the idle time is configured, if the server does not receive service requests from a client within a specified time period, it terminates the connection with the client, thus preventing a user from occupying the connection for a long time without performing any operation.

Table 1-12 Configure connection idle time

Operation	Command	Description
Enter system view	system-view	—
Configure the connection idle time for the SFTP server	ftp timeout time-out-value	Optional 10 minutes by default

 

III. Supported SFTP client software

An H3C S3100 series Ethernet switch operating as an SFTP server can interoperate with SFTP client software, including SSH Tectia Client v4.2.0 (SFTP), v5.0, and WINSCP.

SFTP client software supports the following operations: logging in to a device; uploading a file; downloading a file; creating a directory; modify a file name or a directory name; browsing directory structure; and manually terminating a connection.

For configurations on client software, see the corresponding configuration manual.

 

 

1.3.2  SFTP Configuration: A Switch Operating as an SFTP Client

I. Basic configurations on an SFTP client

By default a switch can operate as an SFTP client. In this case you can connect the switch to the SFTP server to perform SFTP-related operations (such as creating/removing a directory) by executing commands on the switch. Table 1-13 lists the operations that can be performed on an SFTP client.

Table 1-13 Basic configurations on an SFTP client

Operation	Command	Description
Enter system view	system-view	—
Enter SFTP client view	sftp { host-ip | host-name } [ port-num ] [ identity-key { dsa | rsa } | prefer_kex { dh_group1 | dh_exchange_group } | prefer_ctos_cipher { des | aes128 } | prefer_stoc_cipher { des | aes128 } | prefer_ctos_hmac { sha1 | sha1_96 | md5 | md5_96 } | prefer_stoc_hmac { sha1 | sha1_96 | md5 | md5_96 } ] *	Required
Change the working directory on the remote SFTP server	cd pathname	Optional
Change the working directory to be the parent directory	cdup
Display the working directory on the SFTP server	pwd
Create a directory on the remote SFTP server	mkdir pathname
Remove a directory on the remote SFTP server	rmdir pathname
Delete a specified file	delete remotefile	Optional Both commands have the same effect.
	remove remote-file
Query a specified file on the SFTP server	dir [ -a | -l ] [ remote-path ]	Optional If no file name is provided, all the files in the current directory are displayed. The difference between these two commands is that the dir command can display the file name, directory as well as file attributes; while the Is command can display only the file name and directory.
	ls [ -a | -l ] [ remote-path ]
Download a remote file from the SFTP server	get remotefile [ localfile ]	Optional
Upload a local file to the remote SFTP server	put localfile [ remotefile ]
Rename a file on the remote server	rename remote-source remote-dest
Exit SFTP client view and return to system view	bye	The three commands have the same effect.
	exit
	quit
Display the online help about a specified command concerning SFTP	help [ all | command-name ]	Optional

 

 

1.3.3  SFTP Configuration Example

I. Network requirements

As shown in Figure 1-6, establish an SSH connection between the SFTP client (switch A) and the SFTP server (switch B). Log in to switch B through switch A to manage and transmit files. An SFTP user with the user name “client001” and password “abc” exists on the SFTP server.

II. Network diagram

Figure 1-6 Network diagram for SFTP configuration

III. Configuration procedure

1)         Configure the SFTP server (switch B)

# Create key pairs.

<Sysname> system-view

[Sysname] public-key local create rsa

[Sysname] public-key local create dsa

# Create a VLAN interface on the switch and assign to it an IP address, which is used as the destination address for the client to connect to the SFTP server.

[Sysname] interface vlan-interface 1

[Sysname-Vlan-interface1] ip address 192.168.0.1 255.255.255.0

[Sysname-Vlan-interface1] quit

# Specify the SSH authentication mode as AAA.

[Sysname] user-interface vty 0 4

[Sysname-ui-vty0-4] authentication-mode scheme

# Configure the protocol through which the remote user logs in to the switch as SSH.

[Sysname-ui-vty0-4] protocol inbound ssh

[Sysname-ui-vty0-4] quit

# Create a local user client001.

[Sysname] local-user client001

[Sysname-luser-client001] password simple abc

[Sysname-luser-client001] service-type ssh

[Sysname-luser-client001] quit

# Configure the authentication mode as password. Authentication timeout time, retry number, and update time of the server key adopt the default values.

[Sysname] ssh user client001 authentication-type password

# Specify the service type as SFTP.

[Sysname] ssh user client001 service-type sftp

# Enable the SFTP server.

[Sysname] sftp server enable

2)         Configure the SFTP client (switch A)

# Configure the IP address of the VLAN interface on switch A. It must be in the same segment with the IP address of the VLAN interface on switch B. In this example, configure it as 192.168.0.2.

<Sysname> system-view

[Sysname] interface vlan-interface 1

[Sysname-Vlan-interface1] ip address 192.168.0.2 255.255.255.0

[Sysname-Vlan-interface1] quit

# Connect to the remote SFTP server. Enter the user name “client001” and the password “abc”, and then enter SFTP client view.

[Sysname] sftp 192.168.0.1

Input Username: client001

Trying 192.168.0.1 ...

Press CTRL+K to abort

Connected to 192.168.0.1 ...

 

The Server is not authenticated. Do you continue to access it?(Y/N):y

Do you want to save the server's public key?(Y/N):n

Enter password:

 

sftp-client>

# Display the current directory of the server. Delete the file z and verify the result.

sftp-client> dir

-rwxrwxrwx   1 noone    nogroup      1759 Aug 23 06:52 config.cfg

-rwxrwxrwx   1 noone    nogroup       225 Aug 24 08:01 pubkey2

-rwxrwxrwx   1 noone    nogroup       283 Aug 24 07:39 pubkey1

drwxrwxrwx   1 noone    nogroup         0 Sep 01 06:22 new

-rwxrwxrwx   1 noone    nogroup       225 Sep 01 06:55 pub

-rwxrwxrwx   1 noone    nogroup         0 Sep 01 08:00 z

Received status: End of file

Received status: Success

sftp-client> delete z

The following files will be deleted:

/z

Are you sure to delete it?(Y/N):y

This operation may take a long time.Please wait...

 

Received status: Success

File successfully Removed

sftp-client> dir

-rwxrwxrwx   1 noone    nogroup      1759 Aug 23 06:52 config.cfg

-rwxrwxrwx   1 noone    nogroup       225 Aug 24 08:01 pubkey2

-rwxrwxrwx   1 noone    nogroup       283 Aug 24 07:39 pubkey1

drwxrwxrwx   1 noone    nogroup         0 Sep 01 06:22 new

-rwxrwxrwx   1 noone    nogroup       225 Sep 01 06:55 pub

Received status: End of file

Received status: Success

# Add a directory new1, and then check whether the new directory is successfully created.

sftp-client> mkdir new1

Received status: Success

New directory created

sftp-client> dir

-rwxrwxrwx   1 noone    nogroup      1759 Aug 23 06:52 config.cfg

-rwxrwxrwx   1 noone    nogroup       225 Aug 24 08:01 pubkey2

-rwxrwxrwx   1 noone    nogroup       283 Aug 24 07:39 pubkey1

drwxrwxrwx   1 noone    nogroup         0 Sep 01 06:22 new

-rwxrwxrwx   1 noone    nogroup       225 Sep 01 06:55 pub

drwxrwxrwx   1 noone    nogroup         0 Sep 02 06:30 new1

Received status: End of file

Received status: Success

# Rename the directory new1 as new2, and then verify the result.

sftp-client> rename new1 new2

File successfully renamed

sftp-client> dir

-rwxrwxrwx   1 noone    nogroup      1759 Aug 23 06:52 config.cfg

-rwxrwxrwx   1 noone    nogroup       225 Aug 24 08:01 pubkey2

-rwxrwxrwx   1 noone    nogroup       283 Aug 24 07:39 pubkey1

drwxrwxrwx   1 noone    nogroup         0 Sep 01 06:22 new

-rwxrwxrwx   1 noone    nogroup       225 Sep 01 06:55 pub

drwxrwxrwx   1 noone    nogroup         0 Sep 02 06:33 new2

Received status: End of file

Received status: Success

# Download the file pubkey2 from the server and rename it as public.

sftp-client> get pubkey2 public

This operation may take a long time, please wait...

.                                                  

Remote  file:/pubkey2 --->  Local file: public..

Received status: End of file

Received status: Success

Downloading file successfully ended

# Upload the file pu to the server and rename it as puk, and then verify the result.

sftp-client> put pu puk

This operation may take a long time, please wait...

Local file: pu --->  Remote file: /puk

Received status: Success

Uploading file successfully ended

sftp-client> dir

-rwxrwxrwx   1 noone    nogroup      1759 Aug 23 06:52 config.cfg

-rwxrwxrwx   1 noone    nogroup       225 Aug 24 08:01 pubkey2

-rwxrwxrwx   1 noone    nogroup       283 Aug 24 07:39 pubkey1

drwxrwxrwx   1 noone    nogroup         0 Sep 01 06:22 new

drwxrwxrwx   1 noone    nogroup         0 Sep 02 06:33 new2

-rwxrwxrwx   1 noone    nogroup       283 Sep 02 06:35 pub

-rwxrwxrwx   1 noone    nogroup       283 Sep 02 06:36 puk

Received status: End of file

Received status: Success

sftp-client>

# Exit SFTP.

sftp-client> quit

Bye

[Sysname]

 

Chapter 2  TFTP Configuration

2.1  Introduction to TFTP

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:

l           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.

l           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 S3100 series Ethernet switch can act as a TFTP client only.

When an S3100 series Ethernet switch serving as a TFTP client downloads files from

When you download a file that is larger than the free space of the switch’s flash memory:

l           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.

l           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:

l           Binary mode for program file transfer.

l           ASCII mode for text file transfer.

 

 

2.2  TFTP Configuration

Table 2-1 TFTP configuration tasks

Item	Configuration task	Description
TFTP Configuration: A Switch Operating as a TFTP Client	Basic configurations on a TFTP client	—
TFTP server configuration	For details, see the corresponding manual	—

 

2.2.1  TFTP Configuration: A Switch Operating as a TFTP Client

I. Basic configurations on a TFTP client

By default a switch can operate as a TFTP client. In this case you can connect the switch to the TFTP server to perform TFTP-related operations (such as creating/removing a directory) by executing commands on the switch. Table 2-2 lists the operations that can be performed on a TFTP client.

Table 2-2 Basic configurations on a TFTP client

Operation	Command	Description
Download a file from a TFTP server	tftp tftp-server get source-file [ dest-file ]	Optional
Upload a file to a TFTP server	tftp tftp-server put source-file [ dest-file ]	Optional
Enter system view	system-view	—
Set the file transmission mode	tftp { ascii | binary }	Optional Binary by default
Specify an ACL rule used by the specified TFTP client to access a TFTP server	tftp-server acl acl-number	Optional Not specified by default

 

2.2.2  TFTP Configuration Example

I. Network requirements

A switch operates as a TFTP client and a PC as the TFTP server. The application named switch.bin is stored on the PC. Download it (switch.bin) to the switch through TFTP, and use the boot boot-loader command to specify switch.bin as the application for next startup. Reboot the switch to upload the configuration file named config.cfg to the work directory on the PC to back up the configuration file.

l           The TFTP working directory is configured on the TFTP server.

l           Configure the IP addresses of a VLAN interface on the switch and the PC as 1.1.1.1 and 1.1.1.2 respectively. The port through which the switch connects with the PC belongs to the VLAN.

II. Network diagram

Figure 2-1 Network diagram for TFTP configurations

III. Configuration procedure

1)         Configure the TFTP server (PC)

Start the TFTP server and configure the working directory on the PC.

2)         Configure the TFTP client (switch).

# Log in to the switch. (You can log in to a switch through the Console port or by telnetting the switch. See the “Login” module for detailed information.)

 

 

# Enter system view

<Sysname> system-view

[Sysname]

# Configure the IP address of a VLAN interface on the switch to be 1.1.1.1, and ensure that the port through which the switch connects with the PC belongs to this VLAN. (This example assumes that the port belongs to VLAN 1.)

[Sysname] interface Vlan-interface 1

[Sysname-Vlan-interface1] ip address 1.1.1.1 255.255.255.0

[Sysname-Vlan-interface1] quit

# Download the switch application named switch.bin from the TFTP server to the switch.

<Sysname> tftp 1.1.1.2 get switch.bin switch.bin

# Upload the switch configuration file named config.cfg to the TFTP server.

<Sysname> tftp 1.1.1.2 put config.cfg config.cfg

# After downloading the file, use the boot boot-loader command to specify the downloaded file (switch.bin) to be the startup file used when the switch starts the next time, and restart the switch. Thus the switch application is upgraded.

<Sysname> boot boot-loader switch.bin

<Sysname> reboot