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Installation Manual
H3C S7502 Ethernet Switch
Note:
To access Boot Menu, press <Ctrl+B> within five seconds after the screen prompts
"Press Ctrl+B to enter Boot Menu..." Otherwise, the system will start executing the
program decompression and at this time if you want to access Boot Menu, you will have
to reboot the switch.
If the system enters the program decompression process, you will have to wait a long
time for the system to get ready, for the program file is rather big in size and many
commands needs to be registered.
Enter the correct Boot ROM password and the system displays the Boot Menu.
By default, no password is set for the switch.
Caution:
If you want to modify the password, keep in mind the modified one.
1:
Download application file to flash
2:
Select application file to boot
3:
Display all files in flash
4:
Delete file from flash
5:
Modify bootrom password
0:
Reboot
Enter your choice(0-5):
7.2.2 Loading Software from Console Port Using Xmodem
I. Introduction to XModem
The XModem protocol is a file transfer protocol widely used due to its simplicity and
good performances. XModem transfers files through the console port, supporting data
packets of 128 bytes and 1KB. With respect to reliability, it supports checksum, CRC,
and error packet retransmission mechanism. Normally, the maximum number of
retransmission attempts is 10.
XModem transmission is completed by the receiving program and sending program.
The receiving program initiates packet checking method negotiation by sending the
negotiation character. If the negotiation passes, the sending program starts packet
transmission. Upon the receipt of a complete packet, the receiving program checks it
using the agreed-upon checking method. If the check succeeds, the receiving program
Boot Menu
Chapter 7 Software Maintenance
7-3
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