Brocade光纤交换机FOS升级：
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What I usually recommend is this path:
5.0.1d -> 5.2.3 -> 5.3.2c -> 6.0.1a -> 6.1.2c -> 6.2.2g -> 6.3.2e -> 6.4.3h > 7.0.2e > 7.1.2b > 7.2.1g > 7.3.2a > 7.4.2 > 8.0.2b
FOS升级主要步骤：
>>> 查看当前固件版本
2G cannot upgrade to Fabric OS 6.x
4G and 8G can be on Fabric OS 6.x
All 4G except some 4/8 & 4/16 (that’s 200E) and HP’s P- and C-class 4G blade switches (4012 & 4024) can run 6.4.x
8G can run Fabric OS 6.4.x
8G and above can run Fabric OS 7.x
16G (Gen5) needs to be on Fabric OS 7.x or Fabric OS 8.x
32G (Gen6) needs Fabric OS 8.x
>>> 本地部署FTP服务器，并上传合适的新固件文件
>>> 上传当前配置到FTP服务器
>>>如果是级联交换机，请执行switchdisable确认交换机不再运行业务
>>> 执行Firmwaredownload 命令进行升级
>>> 系统自动重启之后确认版本是否升级成功
>>> 下载配置到交换机
>>> cfgsave
>>> cfgenable cfg
>>> 执行 switchenable启用交换机
>>> 然后通过switchshow查看交换机是否成功扫描到 WWN号，通过cfgshow 查看当前运行的配置。
一、上传配置文件到交换机（新交换机）
SW3:admin> configeupload
Protocol (scp, ftp, sftp, local) [ftp]:
Server Name or IP Address [host]: xxx.xxx.xxx.xxx
User Name [user]: admin
Path/Filename [
Section (all|chassis|switch [all]):
Password:
configUpload complete: All selected config parameters are uploaded
SW3:admin>cfgsave
SW3:admin>cfgenable xxxxxxxx
二、升级FOS：
SW3:admin> firmwaredownload
Server Name or IP Address: xxx.xxx.xxx.xxx
User Name: admin
File Name: /v7.0.1b
Network Protocol(1-auto-select, 2-FTP, 3-SCP, 4-SFTP) [1]: 2
Password:
Server IP: 10.77.77.93, Protocol IPv4
Checking system settings for firmwaredownload...
System settings check passed.
You can run firmwaredownloadstatus to get the status
of this command.
This command will cause a warm/non-disruptive boot but will
require that existing telnet, secure telnet or SSH sessions
be restarted.
Do you want to continue (Y/N) [Y]:Y
Firmware is being downloaded to the switch. This step may take up to 30 minutes.
Preparing for firmwaredownload...
Start to install packages...
dir ##################################################
ldconfig ##################################################
glibc ##################################################
glibc-linuxthreads ##################################################
bash ##################################################
readline ##################################################
terminfo ##################################################
等待升级完成。
三、验证：
SW3:admin>firmwareshow
App Primary/Secondary Versions
------------------------------------------
FOS 7.3.2a
7.3.2a
SW3:admin>cfgactvshow
SW3:admin>switchshow
SW3:admin>errdump
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