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思科CCNA辅导：路由器配置和文件管理(2) 1.5. 清除启动配置文件
提问 清除配置文件恢复到出厂设置
回答
Router1#erase nvram: (erase startup-config)
Erasing the nvram filesystem will remove all files! Continue? [confirm]
[OK]
Erase of nvram: complete
Router1#reload
System configuration has been modified. Save? [yes/no]: no
Proceed with reload? [confirm]
注释 无
1.6. 加载新的IOS镜像
提问 升级当前的IOS
回答
Router1#copy tftp://172.25.1.1/c2600-ik9o3s-mz.122-12a.bin FLASH:
Destination filename [c2600-ik9o3s-mz.122-12a.bin]?
Accessing tftp://172.25.1.1/c2600-ik9o3s-mz.122-12a.bin...
Erase flash: before copying? [confirm]
Erasing the flash filesystem will remove all files! Continue? [confirm]
Erasing device... eeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeee ...erased
Erase of flash: complete
Loading c2600-ik9o3s-mz.122-12a.bin from 172.25.1.1 (via FastEthernet0/0.1):!!!!!!!!!!!!!!
[OK - 11135588 bytes]
Verifying checksum... OK (0xE643)
11135588 bytes copied in 82.236 secs (135410 bytes/sec)
Router1# reload
Proceed with reload? [confirm]
注释 无
1.7. 以另一个IOS镜像文件启动
提问 使用其它的IOS镜像启动
回答
Router1#configure terminal
Enter configuration commands, one per line. End with CNTL/Z.
Router1(config)#boot system flash:c3620-jk9o3s-mz.122-7a.bin
Router1(config)#boot system flash:c3620-jos56i-l.120-11.bin
Router1(config)#boot system slot0:c3620-ik9s-mz.122-13.bin
Router1(config)#boot system rom
Router1(config)#end
注释 boot system命令的顺序非常重要，如果使用新的IOS，建议先进行no boot system的操作。从IOS 12.3(4)T 后思科引入了boot markers的概念，所有的boot systme命令都会放在boot markers之间，比如：
Router1#show running-config include ^boot
boot-start-marker
boot system slot0:c3745-ipbasek9-mz.124-6.T.bin
boot system slot0:c3745-ipbasek9-mz.124-7.bin
boot system flash:
boot-end-marker
Router1#
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