04-17-2007 06:17 AM - edited 03-05-2019 03:30 PM
Hi everyone. I have a strange situation where one of our 831b is showing 100% CPU usage and the users aren't complaining at all. I checked the processes and didn't see any that were taking up CPU. The traffic is negligible from what I can see. The router has been running at 100% CPU for more than a day now. The other thing is that another one of our 831 is doing the same thing. Is there any known issue with 831's?
Thanks!
04-17-2007 06:49 AM
Chris,
Can you post the output from show proc cpu sorted?
I would suggest reloading the router, and checking the bug toolkit for issues with the version of code you are running.
Please rate helpful posts.
Dave
04-17-2007 06:59 AM
See attached for the show proc cpu sorted output. I guess I should have mentionned that when I look at the processes, none of them use up ANY CPU at all...
I did look at the bug toolkit but didn't find anything. As for rebooting the router, I would have to do that during the night, unfortunately.
04-17-2007 07:09 AM
Hi,
Can you post "show ver" output?
04-17-2007 07:11 AM
here's the show ver output:
show ver
Cisco IOS Software, C831 Software (C831-K9O3SY6-M), Version 12.3(8)T4, RELEASE SOFTWARE (fc2)
Technical Support: http://www.cisco.com/techsupport
Copyright (c) 1986-2004 by Cisco Systems, Inc.
Compiled Fri 03-Sep-04 08:21 by eaarmas
ROM: System Bootstrap, Version 12.2(8r)YN, RELEASE SOFTWARE (fc1)
ST-RAYMOND uptime is 20 hours, 34 minutes
System returned to ROM by power-on
System image file is "flash:c831-k9o3sy6-mz.123-8.T4.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
Cisco C831 (MPC857DSL) processor (revision 0x400) with 44237K/4915K bytes of memory.
Processor board ID AMB082022NR (2764410859), with hardware revision 0000
CPU rev number 7
2 Ethernet interfaces
4 FastEthernet interfaces
128K bytes of NVRAM.
12288K bytes of processor board System flash (Read/Write)
2048K bytes of processor board Web flash (Read/Write)
Configuration register is 0x2102
04-17-2007 07:29 AM
Hi,
There are multiple bugs and vulnerabilities reported for 12.3(8)T4. Though the 100% CPU util is not listed, it could be a symptom of a new bug or vulnerability. I recommend for you to upgrade your IOS to latest T series, 12.3(14)T7 or 12.4(11)T1
04-17-2007 08:45 AM
I guess I'll just reboot one of the router during the night and see if it helps. I ran a report with our monitoring tool to see the CPU usage in the last year and the average is about 4-5%... Nothing was changed recently on those routers to explain this.
04-17-2007 10:38 AM
Have you made any changes lately?
04-17-2007 10:45 AM
no changes were made recently, that's what's so puzzling about this. I did see a reboot before the CPU went to 100%, though. Is it possible that there would be some kind of invisible process that wouldn't show with show proc cpu?
04-17-2007 10:53 AM
If you are runnig OPSF, please port the output of
show ip ospf max..
04-17-2007 11:12 AM
here's what it gave me:
AS System 1
Maxage delete timer due in NEVER
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