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Community Member

Cisco 1841 rebooted - Alignment correction made at

Hi All,

I suddenly noticed that my one of the IOS-Firewall where all NAT configuration done.

When I verified the log I found below logs....

Router uptime is 33 minutes

System returned to ROM by error - an unknown failure, PC 0x6025C7E4 at 09:37:05 UTC Thu Nov 5 2009

Alignment correction made at 0x602932D0 reading 0xEE9F850E

Nov 5 07:36:22.975: %ALIGN-3-TRACE: -Traceback= 0x602932D0 0x60295EA0 0x600479E4 0x6002A19C 0x62A25574 0x62A2C9A0 0x62A29180

0x62A293FC

Nov 5 07:36:22.979: %ALIGN-3-CORRECT: Alignment correction made at 0x602932D0 reading 0xEEA5A38E

Nov 5 07:36:22.979: %ALIGN-3-TRACE: -Traceback= 0x602932D0 0x60295EA0 0x600479E4 0x6002A19C 0x62A25574 0x62A2C9A0 0x62A29180

0x62A29424

Experts can some one please tell me what is this error came and how it caused to my router reboot.

And please help me to avoid this kind of interrupts in future and what precautions I need to take care as it is core router for my whole organization.

Regards,

Naidu.

5 REPLIES
Super Bronze

Re: Cisco 1841 rebooted - Alignment correction made at

Normally indicates a software defect. See http://www.cisco.com/en/US/products/sw/iosswrel/ps1828/products_tech_note09186a00800a65d1.shtml#align

Bug tool might have it documented. If it does, believe it would note whether it's been fixed or whether there's a work around. Otherwise, you'll need to open a TAC case or perhaps try a different IOS version.

Community Member

Re: Cisco 1841 rebooted - Alignment correction made at

Hi Joseph,

Thanks for your response.

I saw the same site before created this post.

But unfortunately I could not understand what it mean...

Cause

Alignment errors are caused by misaligned reads and writes. For example, a two byte read where the memory address is not an even multiple of two bytes is an alignment error. Alignment errors are caused by a software bug.

Correcting Alignment Errors

Alignment errors can generally be corrected by software and, if so, will not cause a crash. Correcting alignment errors does, however, consume processor resources and can result in a performance penalty. If there are continuous alignment errors, the router can spend most of its time fixing them, increasing the CPU utilization. These errors are corrected at interrupt.

My router showing at first line in show version like...

Router uptime is 33 minutes

System returned to ROM by error - an unknown failure, PC 0x6025C7E4 at 09:37:05 UTC Thu Nov 5 2009

What could be the cause for this...

Regards,

Naidu.

Super Bronze

Re: Cisco 1841 rebooted - Alignment correction made at

"But unfortunately I could not understand what it mean..."

It means, whatever you're doing with this router might have found a "software defect" (i.e. bug).

These shouldn't normally happen. Often the solution is found in moving to a different IOS code version (often newer, sometimes older). If you have a service contract, you would also work with Cisco TAC.

Community Member

Re: Cisco 1841 rebooted - Alignment correction made at

Hi Joseph,

The router have new version. Please find the below show version details.

Unfortunately I have not cisco contract....I am at strange what to do to not repeat in future.

Cisco IOS Software, 1841 Software (C1841-ADVENTERPRISEK9-M), Version 12.4(11)T, RELEASE SOFTWARE (fc2)

Technical Support: http://www.cisco.com/techsupport

Copyright (c) 1986-2006 by Cisco Systems, Inc.

Compiled Sat 18-Nov-06 15:32 by prod_rel_team

ROM: System Bootstrap, Version 12.3(8r)T9, RELEASE SOFTWARE (fc1)

DKIGNFW01 uptime is 5 hours, 24 minutes

System returned to ROM by error - an unknown failure, PC 0x6025C7E4 at 09:37:05 UTC Thu Nov 5 2009

System restarted at 09:34:10 UTC Thu Nov 5 2009

System image file is "flash:c1841-adventerprisek9-mz.124-11.T.bin"

This product contains cryptographic features and is subject to United

States and local country laws governing import, export, transfer and

use. Delivery of Cisco cryptographic products does not imply

third-party authority to import, export, distribute or use encryption.

Importers, exporters, distributors and users are responsible for

compliance with U.S. and local country laws. By using this product you

agree to comply with applicable laws and regulations. If you are unable

to comply with U.S. and local laws, return this product immediately.

A summary of U.S. laws governing Cisco cryptographic products may be found at:

http://www.cisco.com/wwl/export/crypto/tool/stqrg.html

If you require further assistance please contact us by sending email to

export@cisco.com.

Cisco 1841 (revision 6.0) with 236544K/25600K bytes of memory.

Processor board ID FCZ1037221E

2 FastEthernet interfaces

1 Virtual Private Network (VPN) Module

DRAM configuration is 64 bits wide with parity disabled.

191K bytes of NVRAM.

62720K bytes of ATA CompactFlash (Read/Write)

Configuration register is 0x2102

Thanks in advance.

Regards,

Naidu.

Super Bronze

Re: Cisco 1841 rebooted - Alignment correction made at

"The router have new version."

Actually it has a "newer" 12.4T release, but I just looked and didn't see any 12.4(11)T releases except 12.4(11)T1..4 under "Deferred Releases" (which normally indicates bugs so bad they've been pulled from distribution).

"Unfortunately I have not cisco contract."

That makes things more difficult. Since it appears most, if not all, of the 12.4(11)T series for an 1841 are "deferred", Cisco might provide you another release if you contact them. I believe it might also be possible to purchase another IOS image, but I'm unsure. Perhaps someone more familar with software licensing might comment.

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