IOS startup

Answered Question
Apr 8th, 2007

I have CISCO 2811 router. I have tried to change the sequence of router to load IOS on it.

I selected ROM first and then FLASH memory for router to load IOS.

But whenever I restarts the router, it loads IOS from FLASH only and not from ROM.

It gives an error msg. showing "unable to boot from ROM" .

I have tried with different register settings of the router.Router ROMis working properly as I can load IOS from ROM in the absence of FLASH.


Pls let me know if its a hardware problem or i am doing something wrong.


Correct Answer by mahmoodmkl about 9 years 10 months ago

Hi


Rommon mode is used in absence of the valid IOS on flash.


The rom contains a lower verions of IOS used to troubleshoot booting problems.So in the presence of FLASH which contains the IOS it will not go to rommon mode.


Thanks


Mahmood

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Correct Answer
mahmoodmkl Sun, 04/08/2007 - 22:16

Hi


Rommon mode is used in absence of the valid IOS on flash.


The rom contains a lower verions of IOS used to troubleshoot booting problems.So in the presence of FLASH which contains the IOS it will not go to rommon mode.


Thanks


Mahmood

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