一、前言 通常情况下，交换机是非常稳定的，但只要是软件就会有bug，所以设备厂家都会提供固件的更新，比如我使用的华三交换机，就出现了一些奇奇怪怪的问题，随即想到升级固件试一下。
二、固件下载 华三交换机固件下载地址在华三官网 首页-支持-文档与软件-软件下载-交换机 https://www.h3c.com/cn/Service/Document_Software/Software_Download/Switches/ 官方提供了下载专用的用户名密码 用户名：yx800 密码：01230123
注意：华三交换机的系统固件和BootRom已经放在一块了，一次升级即可全部升级。 注意：不同固件的华三命令稍有不同，若命令无法执行，用问号？可查看详细提示。
我的交换机型号为H3C S5120-28P-SI，能够选择的最新的固件为H3C S5120SI_E-CMW520-R1519P06，下载该型号并解压出 S5120SI_E-CMW520-R1519P06.bin
三、TFTP环境准备 下载3CDaemon汉化版，并配置TFTP服务
配置服务目录
注意：关闭系统防火墙或添加端口
四、交换机清空配置并直连电脑 清空的目的是为了防止有配置兼容问题
代码语言：javascript复制<H3C>reset saved-configuration
The saved configuration file will be erased. Are you sure? [Y/N]:y
Configuration file in flash is being cleared.
Please wait ...
Configuration file is cleared.
<H3C>reboot
Start to check configuration with next startup configuration file, please wait.........DONE!
This command will reboot the device. Current configuration may be lost in next startup if you continue. Continue? [Y/N]:y
System is rebooting now.为交换机配置vlanip与电脑互联，电脑IP为192.168.18.2
代码语言：javascript复制<H3C>sys
System View: return to User View with Ctrl Z.
[H3C]int vlan 1
[H3C-Vlan-interface1]ip add 192.168.18.1 24
[H3C-Vlan-interface1]ping 192.168.18.2
PING 192.168.18.2: 56 data bytes, press CTRL_C to break
Reply from 192.168.18.2: bytes=56 Sequence=1 ttl=64 time=7 ms
Reply from 192.168.18.2: bytes=56 Sequence=2 ttl=64 time=3 ms
Reply from 192.168.18.2: bytes=56 Sequence=3 ttl=64 time=3 ms
Reply from 192.168.18.2: bytes=56 Sequence=4 ttl=64 time=3 ms
--- 192.168.18.2 ping statistics ---
4 packet(s) transmitted
4 packet(s) received
0.00% packet loss
round-trip min/avg/max = 3/4/7 ms
五、上传固件 空间充裕
代码语言：javascript复制[H3C-Vlan-interface1]quit
[H3C]quit
<H3C>dir
Directory of flash:/
0 -rw- 341 Apr 26 2000 12:10:45 system.xml
1 -rw- 10184320 Jun 29 2010 14:14:25 s5120si-cmw520-r1101p10.bin
2 drw- - Apr 26 2000 12:00:02 logfile
97920 KB total (81690 KB free)上传固件
代码语言：javascript复制<H3C>tftp 192.168.18.2 get S5120SI_E-CMW520-R1519P06.bin
File will be transferred in binary mode
Downloading file from remote TFTP server, please wait.../
TFTP: 14877696 bytes received in 118 second(s)
File downloaded successfully.
<H3C>dir
Directory of flash:/
0 -rw- 14877696 Apr 26 2000 12:19:55 s5120si_e-cmw520-r1519p06.bin
1 -rw- 341 Apr 26 2000 12:10:45 system.xml
2 -rw- 10184320 Jun 29 2010 14:14:25 s5120si-cmw520-r1101p10.bin
3 drw- - Apr 26 2000 12:00:02 logfile
97920 KB total (67158 KB free)六、安装固件 配置新固件为第一启动项
代码语言：javascript复制<H3C>boot-loader file flash:/s5120si_e-cmw520-r1519p06.bin main
This command will set the boot file. Continue? [Y/N]:y
The specified file will be used as the main boot file at the next reboot on slot 1!
<H3C>reboot
Start to check configuration with next startup configuration file, please wait.........DONE!
This command will reboot the device. Current configuration may be lost in next startup if you continue. Continue? [Y/N]:y
Reboot device by command.
System is rebooting now.自动安装固件，全程等待，直至自动进入系统
代码语言：javascript复制Starting......
************************************************************************
* *
* H3C S5120-28P-SI BOOTROM, Version 119 *
* *
************************************************************************
Creation Date : Feb 3 2010
CPU L1 Cache : 32KB
CPU Clock Speed : 333MHz
Memory Size : 128MB
Flash Size : 128MB
CPLD Version : 002
PCB Version : Ver.B
Mac Address : C4CAD99DD5A6
Press Ctrl-B to enter Extended Boot menu...0
Starting to get the main application
file--flash:/s5120si_e-cmw520-r1519p06.bin!....................................
..............................................................................
The main application file is self-decompressing................................
...............................................................................
...............................................................................
............Done!
Extend BootWare Version is not equal,updating? (Y/N):
Updating extended BootRom...Done!
Basic BootWare Version is not equal,updating? (Y/N):
Updating Basic BootRom...Done!
BootWare updated,System is rebooting now.
Starting......
Press Ctrl D to access BASIC BOOT MENU
Press Ctrl T to start memory test
********************************************************************************
* *
* H3C S5120-28P-SI BOOTROM, Version 180 *
* *
********************************************************************************
Copyright (c) 2004-2017 New H3C Technologies Co., Ltd.
Creation Date : Aug 9 2017
CPU L1 Cache : 32KB
CPU Clock Speed : 333MHz
Memory Size : 128MB
Flash Size : 128MB
CPLD Version : 002
PCB Version : Ver.B
Mac Address : C4CAD99DD5A6
the normal and back basic is not equal, update back basic....
the normal and back extend is not equal, update back extend....
Press Ctrl-B to enter Extended Boot menu...0
Starting to get the main application file--flash:/s5120si_e-cmw520-r1519p06.bin!
................................................................................
..................................
The main application file is self-decompressing.................................
................................................................................
................................................................................
.........Done!
System is starting...
Startup configuration file does not exist.
It will take a long time to get configuration file, please wait...
Press CTRL_C to break
Retrieving configuration file failed!
User interface aux0 is available.
Press ENTER to get started.
<H3C>
七、删除旧固件，并为当前交换机保存配置文件
代码语言：javascript复制<H3C>del s5120si-cmw520-r1101p10.bin
Delete flash:/s5120si-cmw520-r1101p10.bin?[Y/N]:y
�lete file flash:/s5120si-cmw520-r1101p10.bin...Done.
<H3C>dir
Directory of flash:/
0 -rw- 1617 Apr 26 2000 12:01:22 startup.cfg
1 -rw- 341 Apr 26 2000 12:10:45 systembak.xml
2 -rw- 7655 Apr 26 2000 12:01:20 config.cwmp
3 -rw- 14877696 Apr 26 2000 12:19:55 s5120si_e-cmw520-r1519p06.bin
4 drw- - Apr 26 2000 12:00:02 logfile
97920 KB total (67142 KB free)
<H3C>save
The current configuration will be written to the device. Are you sure? [Y/N]:y
Please input the file name(*.cfg)[flash:/startup.cfg]
(To leave the existing filename unchanged, press the enter key):
flash:/startup.cfg exists, overwrite? [Y/N]:y
Validating file. Please wait....
Saved the current configuration to mainboard device successfully.
Configuration is saved to device successfully.
八、升级完成
如果升级完成后交换机仍有问题，那就扔了吧
