We have 1841 IOSFW (WAN Router) which is connected to Provider Internet Router.
Yesterday I have upgraded the IOS from Old 12.4(11) to New 12.4(19).
I checked the CPU & Memory usage for last one week and it is normal (memory used up to 30 Mbytes).
Today I just cleared the NAT translations "clear ip nat tra fo" after that router got hang and rebooted itself.
We found in flash that crash dump has been created. Please find the below #sh flash & #sh ver details:
13 23431096 Mar 22 2010 17:51:06 +00:00 c1841-advipservicesk9-mz.124-19.bin
14 193696 Mar 23 2010 08:56:18 +00:00 crashinfo_20100323-085619
Cisco IOS Software, 1841 Software (C1841-ADVIPSERVICESK9-M), Version 12.4(19), RELEASE SOFTWARE (fc1)
Technical Support: http://www.cisco.com/techsupport
Copyright (c) 1986-2008 by Cisco Systems, Inc.
Compiled Fri 29-Feb-08 18:45 by prod_rel_team
ROM: System Bootstrap, Version 12.3(8r)T9, RELEASE SOFTWARE (fc1)
DKIGNFW02 uptime is 16 minutes
System returned to ROM by error - a Software forced crash, PC 0x60504CE8 at 08:56:19 UTC Tue Mar 23 2010
System restarted at 08:58:19 UTC Tue Mar 23 2010
System image file is "flash:c1841-advipservicesk9-mz.124-19.bin"
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email@example.com. 1841 (revision 6.0) with 233472K/28672K bytes of memory.
Processor board ID FCZ1037221F
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
Did anyone experienced this kind of issue or can someone tell me why it happend like this and what steps need to take care to not repeat in future.
as Leo has noted there is no bug free IOS image.
with this in mind I like to use 12.4T versions rather then main line.
I would try to install a 12.4(20)T2 version for your device same feature set.
I wouldn't use a very last version like 12.4(24)T.
Take it as a suggestion with no guaranties of success.
Also I would consider to keep the old working image unless you have a need for this change.
Hope to help