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 命令的顺序非常重要，如果使用新的 ，建议先进行 的操作。从
boot system IOS no boot system
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# |
