H3C SECBLADESSLVPN-CMW340-E7111 - Release Notes

H3C SECBLADESSLVPN-CMW340-E7111 Release Notes
April 28, 2011 Page 25 of 49
| <2> Set The Operating Device |
| <3> Set The Default Boot Device |
| <0> Exit To Main Menu |
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Enter your choice(0-3):
Table 15 describes the storage device operation submenu items.
Table 15 Storage device operation submenu
Submenu item Description
<1> Display All Available
Nonvolatile Storage
Device(s)
Display all available storage devices.
<2> Set The Operating
Device
Configure the current operating device.
<3> Set The Default Boot
Device
Set the default boot device.
<0> Exit To Main Menu Return to the main menu.
Upgrading the BootWare Program and Applications Through the
Serial Interface
Introduction to Xmodem
You need to use the Xmodem protocol when upgrading the BootWare program and applications
through the serial interface (console interface).
XModem is a file transfer protocol widely used for its simplicity and good performance. Modem
transfers files through serial interfaces. It supports transmission of packets in 128 bytes and 1024
bytes, error check (checksum and CRC), and error retransmission (generally the maximum number of
retransmission attempts is 10).
XModem transmission is completed by the cooperation of a receiver and a sender. The receiver
sends a negotiation message to the sender to negotiate an error check method. After the negotiation,
the sender starts to transmit data packets. After a complete packet is received, the receiver checks
the packet using the agreed method.
l If the check is passed, the receiver sends an acknowledgement message to the sender. Upon
receiving the message, the sender continues to send the next packet.
l If the check fails, the receiver sends a negative acknowledgement message to the sender. Upon
receiving the message, the sender retransmits the packet.