10-08-2012 05:54 AM - edited 03-07-2019 09:20 AM
Hello,
I've never had a router's CPU suddenly hit 99% and just stay like it for hours even after a reboot. This router really does nothing with regards to CPU, I'm looking at it's CPU history (via SolarWinds Orion NPM software that we use) and it is arounf 1-3% all the time for the past 2 years.
What commands can I use to diagnose the issue?
I did a show debugigng and it seems no debugging is running
Thanks
10-08-2012 06:00 AM
Can you paste the output of this command;:
show processes cpu
see this link:
Regards
Please rate if it helps.
10-08-2012 06:00 AM
Hi Andy,
Can you see the output of the show process cpu sorted 1m and post it here? This output should tell you the processes whose 1-minute CPU load average is the highest. This should eventually help us see what process consumes the most of your CPU power.
Best regards,
Peter
10-08-2012 06:19 AM
Thanks guys, it's
97.37% IP NAT Ager
The routers main purpose is to NAT to be honest.
10-08-2012 06:26 AM
Hi Andy,
To find out the root cause you can enable netflow in your local lan interface and find out whats happening with the traffic transactions.
With that you can come to a solid conclusion or atleast get a clue on what is making or hogging the CPU up.
Configure ip route-cache flow under your local lan ethernet interface and make use of show ip cache flow to check the traffic transactions.
Hope the below link helps u out.
http://www.cisco.com/en/US/docs/ios/12_3/switch/command/reference/swi_s1.html#wp1066187
may be its a Buggy IOS, upgrade.?
regds
Please rate if it helps.
10-08-2012 06:32 AM
Maybe a bug, Neflow is already running and shows hardly any traffic.
10-08-2012 06:23 AM
Memory is up from 20% to 80% too.
10-08-2012 06:42 AM
Hello Andy
Can you give a clear ip nat translation * and see whether the CPU comes down.. and what is the traffic on the outgoin interface show interface < interface name>
Regards
Harish.
10-08-2012 06:45 AM
Hi, I've already clear the table and it still stays at 99%
IOS is old, had a look a newer IOS but there are so many to choose, I'd appreciate if you can help locate a newer one? Form the below output it would seem that the memory is 128mb and flash 32mb, I tried to see if this current IOS has been deferred but it wasn't listed.
Compiled Fri 30-Nov-07 14:10 by prod_rel_team
ROM: System Bootstrap, Version 12.3(8r)T8, RELEASE SOFTWARE (fc1)
NAT_router uptime is 3 hours, 23 minutes
System returned to ROM by power-on
System restarted at 11:14:50 bst Mon Oct 8 2012
System image file is "flash:c1841-ipbasek9-mz.124-18.bin"
Cisco 1841 (revision 5.0) with 114688K/16384K bytes of memory.
Processor board ID FCZ092822QY
2 FastEthernet interfaces
DRAM configuration is 64 bits wide with parity disabled.
191K bytes of NVRAM.
31744K bytes of ATA CompactFlash (Read/Write)
10-08-2012 09:40 AM
Hi Andy,
See this link:http://tools.cisco.com/ITDIT/CFN/
Chosse what services you want on router and decide which IOS u can take.
Regards
Please rate if it helps.
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