
Installation Manual
H3C S7500E Series Ethernet Switches
Chapter 6 Software Maintenance
6-8
6.2.4 Downloading Through the Console Port Using XMODEM
I. Introduction to XMODEM
The XMODEM protocol is a file transfer protocol widely used due to its simplicity and
good performance. XMODEM transfers files through the console port, supporting data
packets of 128 bytes and 1 KB. With respect to reliability, XMODEM supports
checksum, CRC, and error packet retransmission mechanism. Normally, the maximum
number of transmission attempts is 10.
XMODEM transmission is completed by the receiving and sending program. The
receiving program initiates packet checking method negotiation by sending the
negotiation character. After negotiation, the sending program starts packet
transmission. Upon the receipt of a complete packet, the receiving program checks it
using the negotiated checking method. If the check succeeds, the receiving program
sends an acknowledgement character; if the check fails, it sends a negative
acknowledgement character. Upon the receipt of an acknowledgement, the sending
program continues to send the next packet; upon the receipt of a negative
acknowledgement, it retransmits the packet.
Note:
Since it takes a long time to download the host software package through the console
port using XMODEM, you may use other alternatives if available.
II. Downloading the host software package
Follow these steps to download the host software package onto the switch:
1)
Enter the Boot Menu (refer to section 6.2.1 “BOOT Menu” on page 6-2), and enter
1
when the system displays “Enter your choice(0-5):” to enter the download
protocol menu.
BOOT MENU
1. Download application file to device
2. Select application file to boot
3. Display all files in device
4. Delete file from device
5. Modify bootrom password
0. Reboot
Enter your choice(0-5): 1
2)
On the download protocol menu, type
3
to select XMODEM and press
Enter
, and
then the system will prompt you to input the name of the file to be downloaded.
1. Set TFTP protocol parameter
2. Set FTP protocol parameter