F3215-HP Load Balancing Module System Maintenance Configuration Guide-6PW101

Configuring TFTP

TFTP can be configured only at the CLI.

Overview

Trivial File Transfer Protocol (TFTP) is a simplified version of FTP for file transfer over secure reliable

networks. TFTP uses UDP port 69 for connection establishment and data transmission. In contrast to

TCP-based FTP, TFTP requires no authentication or complex message exchanges, and is easier to deploy.

TFTP supports the following transfer modes:

• Binary mode—Used to transfer image files, such as .app, .bin, and .btm files.

• ASCII mode—Used to transfer text files, such as .txt, .bat, and .cfg files.

The device can operate only as a TFTP client (see Figure 35) to upload or dow

nload files.

Figure 35 TFTP application scenario

Prerequisites

Run a TFTP server program on the file host and set a TFTP working directory.

Configure IP addresses and routes to make sure the device and the TFTP server can reach each other.

Using the device as a TFTP client

The device provides the following modes for downloading a new file from a TFTP server:

• Normal download—The new file is written directly to the storage medium and overwrites the old file

that has the same name as it. If file download is interrupted, both old and new files are lost.

• Secure download—The new file is downloaded to memory and will not be written to the storage

medium until the whole file is obtained. A download failure does not affect the old file that has the

same name as the old file.

To avoid undesired file loss, use the secure download mode. If you use the normal download mode

because of insufficient memory, assign the new file a file name unique in the storage medium.

You can use the tftp client source command to specify a source IP address or source interface for the

TFTP packets sent by the device. If a source interface (typically a loopback interface) is specified, its

primary IP address is used as the source IP address for the TFTP packets. The source interface and source

IP address settings overwrite each other.

The tftp client source command setting applies to all TFTP sessions. When you set up a TFTP session with

the tftp command, you can also specify a different source IP address for the TFTP session.