6500 Router Rommon problem.

[tonmoytalukder047]

Hello,

My Cisco 6509 Router is trying to reboot continuously. It is not going to even in the ROMMON mode and so I can't give any command input, can't change the config-register or anything. The message I'm getting from console login is:

*** System received a Software forced crash ***
signal= 0x17, code= 0x5, context= 0x0
PC = 0x801000f4, Cause = 0x20, Status Reg = 0x30409003

System Bootstrap, Version 8.5(2)
Copyright (c) 1994-2007 by cisco Systems, Inc.
Cat6k-Sup720/SP processor with 1048576 Kbytes of main memory

Autoboot executing command: "boot bootflash:s72033-adventerprisek9_wan-mz.122-33.SXI14.bin"
Loading image, please wait ...

Initializing ATA monitor library...

Error : compressed image checksum is incorrect 0x1C5885C7
Expected a checksum of 0xAA32AD56

*** System received a Software forced crash ***
signal= 0x17, code= 0x5, context= 0x0
PC = 0x801000f4, Cause = 0x20, Status Reg = 0x30409003

System Bootstrap, Version 8.5(2)
Copyright (c) 1994-2007 by cisco Systems, Inc.
Cat6k-Sup720/SP processor with 1048576 Kbytes of main memory

Autoboot executing command: "boot bootflash:s72033-adventerprisek9_wan-mz.122-33.SXI14.bin"
Loading image, please wait ...

Initializing ATA monitor library...

Error : compressed image checksum is incorrect 0x1C5885C7


It's just looping again and again. How can I solve this issue? Any suggestion will be highly appreciated.

[cofee]

This may help.

http://www.cisco.com/c/en/us/support/docs/switches/catalyst-6000-series-switches/17050-14.html

[tonmoytalukder047]

Thanks Cofee@0400.

But the problem is, I can't input a single letter from console as the router is continuously looping. Even if it was in the ROMMON mode, I could run the Rommon recovery commands. But it is not taking any input.

If I remove the sup-bootflash card physically and try to boot it from disk0:, will it be helpful?

[cofee]

Have you tried hard reboot and reseating of sup module ? Also did you check if fan tray seated properly? If so you can go ahead and try to boot from external memory 

[tonmoytalukder047]

Hi cofee@0400,

Yes, I have given hard reboot several times and the result is same. I also opened and reconnected the Sup-module. But the issue was still same.

The only thing I can check now is open the Sup-module aside and try to reboot. 

By the way, I guess the running config is creating this problem. Is there any way where I can erase the running config at this stage?

Thanks.

[Leo Laohoo]

Error : compressed image checksum is incorrect 0x1C5885C7
Expected a checksum of 0xAA32AD56

This means the IOS file the supervisor card is trying to read is corrupt.  

Recovering a Catalyst 6500/6000 Running Cisco IOS System Software from a Corrupted or Missing Boot Loader Image or ROMmon Mode

[tonmoytalukder047]

Thanks Leo.

Actually, the sup-bootflash and disk0: both have 3 images each. And the BOOTLDR is trying to boot from only 1 image. I wish I could change the BOOTLDR but since it is not going to ROMMON mode, I can't give any input.

Is there any way where I can erase the running config or change the BOOTLDR at this stage?

[Leo Laohoo]

If the system boots into ROMmon, then change the config-registry to 0x2101.  This will force the system to boot any viable IOS. 

Once the system boots up, change the config-registry value back to 0x2102.

[tonmoytalukder047]

Hi Leo,

The Sup-module is not going to even in the ROMMON mode. Just looping again and again. That is the problem. 

If it would go to the ROMMON mode, I could follow what you said (config-registry --> 0x2101, then 0x2102.)

[Leo Laohoo]

Click the link I've provided.  There is clear instructions on how to interrupt the boot process.

[tonmoytalukder047]

OK guys,

This issue is solved.

Problem:1) Sup-1 was looping continuously and not coming into ROMMON mode.

Solution:
Opened the Sup-module, opened the sup-bootflash, opened the RAM and then reconnected all those and powered up the Sup-module. Then it came to ROMMON.

The sup-bootflash and in the disk0, both had 3 images each (same 3 images). Then typed the following:

rommon1 > confreg 2

rommon > reset

Then the router booted from one of the 3 valid images. After router is up, I changed the config register to 0x2102 and reboot it again.

Router (config) # config-register 0x2102.

Router (config) # do wr.

Router (config) # end

Router # reload

Thanks to all who gave suggestions. Have a nice day.

[cofee]

Thanks for taking time to let us know how the issue was resolved. It will be beneficial for the Cisco community. Glad to hear that you are back in business.