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

Difan Zhao · ‎02-24-2012

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

deyadav · ‎02-24-2012

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

View solution in original post

Mandlenkosi Nkiwane · ‎02-24-2012

Take a look at this discussion:

https://supportforums.cisco.com/thread/53429

and the link below:

http://www.cisco.com/en/US/docs/switches/lan/catalyst6500/catos/5.x/configuration/guide/boot.html#wp1020006

deyadav · ‎02-24-2012