H3c-technologies H3C S5120 Series Switches User Manual download pdf (Page 279)

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2-2

When the device serves as the TFTP client, you need to perform the following configuration:

Table 2-1 Configuration when the device serves as the TFTP client

Device Configuration Remarks

Device (TFTP client)

z Configure the IP address and routing function,

and ensure that the route between the device

and the TFTP server is available.

z Use the tftp command to establish a connection

to the remote TFTP server to upload/download

files to/from the TFTP server

—

PC (TFTP server)

Enable TFTP server on the PC, and configure the

TFTP working directory.

—

Configuring the TFTP Client

When a device acts as a TFTP client, you can upload a file on the device to a TFTP server and

download a file from the TFTP server to the local device. You can use either of the following ways to

download a file:

z Normal download: The device writes the obtained file to the storage medium directly. In this way, if

you download a remote file using a filename destination-filename that exists in the directory, the

device deletes the original file and then saves the new one. If file download fails due to network

disconnection or other reasons, the original system file will never recover because it has been

deleted.

z Secure download: The device saves the obtained file to its memory and does not write it to the

storage medium until the whole file is obtained. In this way, if you download a remote file using a

filename destination-filename that exists in the directory, the original file is not overwritten. If file

download fails due to network disconnection or other reasons, the original file still exists. This mode

is more secure but consumes more memory.

You are recommended to use the secure mode or, if you use the normal mode, specify a filename not

existing in the current directory as the target filename when downloading the startup file or the startup

configuration file.

Before using the tftp command to establish a TFTP connection, you can perform source address

binding. Source address binding means to configure an IP address on a stable interface such as a

loopback interface, and then use this IP address as the source IP address of a TFTP connection. The

source address binding function simplifies the configuration of ACL rules and security policies. You just

need to specify the source or destination address argument in an ACL rule as this address to filter

inbound and outbound packets on the device, ignoring the difference between interface IP addresses

as well as the affect of interface statuses. You can configure the source address by configuring the

source interface or source IP address. The primary IP address configured on the source interface is the

source address of the transmitted packets. The source address of the transmitted packets is selected

following these rules:

z If no source address of the TFTP client is specified, a device uses the IP address of the interface

determined by the matched route as the source IP address to communicate with a TFTP server.

z If the source address is specified with the tftp client source or tftp command, this source address

is adopted.

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H3c-technologies H3C S5120 Series Switches User Manual Page 279

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