cisco route 831 IOS 备份升级ISO

see also:http://www.cisco.com/en/US/products/hw/routers/ps380/products_tech_note09186a0080094b23.shtml#topic1

写入配置改动到配置文件

write memory

备份配置文件

copy startup-config tftp

备份ISO

copy flash tftp

下载更新ISO

copy tftp flash

reload