H3C SecPath F1000-E Installation Manual

Contents

H3C SecPath F1000-E Installation Manual Manual pdf 89 page image

Installation ManualH3C SecPath F1000-E Firewall Chapter 6 Maintaining Software6-116.3 Upgrading BootWare and an Application Through a SerialInterface6.3.1 Introduction to XmodemUse Xmodem when upgrading BootWare and an application through a serial interface.Xmodem is a file transfer protocol that is widely used due to its simplicity and highperformance. Xmodem transfers files through a serial interface. It supports two types ofdata packets (128 bytes and 1 KB), two check methods (checksum and CRC), anderror packet retransmission mechanism (generally the maximum number ofretransmission attempts is 10).The Xmodem transmission procedure is completed by the cooperation of a receivingprogram and a sending program. The receiving program sends a negotiation characterto negotiate a packet check method. After the negotiation, the sending program startsto transmit data packets. When receiving a complete packet, the receiving programchecks the packet using the agreed method.z If the check succeeds, the receiving program sends an acknowledgementcharacter and the sending program proceeds to send another packet.z If the check fails, the receiving program sends a negative acknowledgementcharacter and the sending program retransmits the packet.6.3.2 Modifying Serial Interface ParametersIn actual applications, you need to make the serial interface baud rate higher to saveupgrading time or make it lower to guarantee transmission reliability. This sectionintroduces how to adjust the serial interface baud rate.Enter the BootWare main menu and select 2 to enter the serial interface submenu, andthen select 5 on the submenu to modify the baud rate. The system displays thefollowing:===============================================|Note:'*'indicates the current baudrate || Change The HyperTerminal's Baudrate Accordingly || Press 'Enter' to exit with things untouched. ||---------------------------------------|| <1> 9600(Default) * || <2> 19200 || <3> 38400 || <4> 57600 || <5> 115200 || <0> Exit |=============================================================