6509 with Sup 32 always boots into rommon after reset or power cycle

Answered Question
Feb 24th, 2012
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Hi experts,


It could be something simple but I just can't figure it out.


Router#show bootvar

BOOT variable = sup-bootdisk:s3223-advipservicesk9_wan-mz.122-33.SXH4.bin,12;


Router#show version | in Configuration register

Configuration register is 0x2102



Router#show sup-bootdisk:

2     58291204 Feb 22 2012 17:05:12 s3223-advipservicesk9_wan-mz.122-33.SXH4.bin


There is one thing which puzzles me. I just learned that the supervisor actually has SP as well as a RP. Once it boots up, it gives the control to the RP. Then I found this command to check the SP setting. The register is 0x0.


Router#remote command switch show version | in Configuration register

Configuration register is 0x0


Is this the reason why it doesn't boot the IOS automatically? If yes, how do I set the register in the SP?


Thanks!

Difan

Correct Answer by deyadav about 5 years 2 months ago

Hi Difan,


During bootup the control first goes to SP, and if its config-register is set to 0x0, then for sure it will fall to Rommon.


Simply try this from IOS exec prompt:


- conf t

- config-register 0x2102

- exit

- wr mem


As this is a Native IOS, configuration is possible only from RP. Once you set config-register on RP, followed

by "wr mem", SP too would get in sync with same config-register value.


Or, when in Rommon, you could also reset the config-register for SP:


rommon 1 > confreg 0x2102


rommon 2 > reset



Any of the above two should fix the problem.


HTH.


Best Regards,

Deepak

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Correct Answer
deyadav Fri, 02/24/2012 - 22:56
User Badges:
  • Cisco Employee,

Hi Difan,


During bootup the control first goes to SP, and if its config-register is set to 0x0, then for sure it will fall to Rommon.


Simply try this from IOS exec prompt:


- conf t

- config-register 0x2102

- exit

- wr mem


As this is a Native IOS, configuration is possible only from RP. Once you set config-register on RP, followed

by "wr mem", SP too would get in sync with same config-register value.


Or, when in Rommon, you could also reset the config-register for SP:


rommon 1 > confreg 0x2102


rommon 2 > reset



Any of the above two should fix the problem.


HTH.


Best Regards,

Deepak

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