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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# |   
 
 
 
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