High CPU utilization
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05-18-2010 10:18 AM - edited 03-06-2019 11:09 AM
Hi
I am facing a prolem my cpu utilization goes high intermittenly
my router has ios : c2600-ipbase-mz.123-26.bin
Model: cisco 2621XM
plz find the" show pro cpu" its show 99% , also plz ignore the virtual exec process as this i have used to generate the show tech outout.
I have to removed the show run due to security issue.
I m using multilink can that be a reason and also load i doubt in the link load also, can someone plz comment on muy onbservation.
Thaks in advance
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05-18-2010 02:29 PM
Hi,
So from what you said the CPU spikes are correlated to an unknown recurrent event right ? Do you have SNMP polling in place ? Any instability with your routing protocol ? Any script running an a regular basis which could poll the router as well ?
Do you have cef enabled ?
HTH
Laurent.
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05-18-2010 07:27 PM
Hi
Yes cef has been enabled and i can see high cpu utilization in the " show proc cpu" but not able to trace the exact process that is causing high cpu.
I have seen in the cisco output inter[retter and it show load is due to interrupt and is caused by high traffic but i want to analyze which IP s are generating high traffic what steps or command output will help me in analyzing the same.
In the " show interface switching" shows:
show interfaces switching
FastEthernet0/0
Throttle count 0
Drops RP 0 SP 0
SPD Flushes Fast 0 SSE 0
SPD Aggress Fast 0
SPD Priority Inputs 41528 Drops 0
Protocol IP
Switching path Pkts In Chars In Pkts Out Chars Out
Process 53922 5326429 83037 36967369
Cache misses 65673 - - -
Fast 102813512 2249272985 95996295 1668803525
Auton/SSE 0 0 0 0
Protocol DEC MOP
Switching path Pkts In Chars In Pkts Out Chars Out
Process 0 0 266 20482
Cache misses 0 - - -
Fast 0 0 0 0
Auton/SSE 0 0 0 0
Protocol ARP
Switching path Pkts In Chars In Pkts Out Chars Out
Process 41522 2491320 291 17460
Cache misses 0 - - -
Fast 0 0 0 0
Auton/SSE 0 0 0 0
Protocol Other
Switching path Pkts In Chars In Pkts Out Chars Out
Process 5292 296352 15829 949740
Cache misses 0 - - -
Fast 0 0 0 0
Auton/SSE 0 0 0 0
NOTE: all counts are cumulative and reset only after a reload.
======================================
FastEthernet0/1
Throttle count 0
Drops RP 0 SP 0
SPD Flushes Fast 0 SSE 0
SPD Aggress Fast 0
SPD Priority Inputs 1070 Drops 0
Protocol IP
--More-- Switching path Pkts In Chars In Pkts Out Chars Out
Process 143652 85012905 101498 53325996
Cache misses 906 - - -
Fast 95700365 1869229308 102494868 1962945539
Auton/SSE 0 0 0 0
Protocol DEC MOP
Switching path Pkts In Chars In Pkts Out Chars Out
Process 0 0 266 20482
Cache misses 0 - - -
Fast 0 0 0 0
Auton/SSE 0 0 0 0
Protocol ARP
Switching path Pkts In Chars In Pkts Out Chars Out
Process 14 840 38 2280
Cache misses 0 - - -
Fast 0 0 0 0
Auton/SSE 0 0 0 0
Protocol Other
Switching path Pkts In Chars In Pkts Out Chars Out
Process 0 0 15829 949740
Cache misses 0 - - -
Fast 0 0 0 0
Auton/SSE 0 0 0 0
Thnaks
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05-19-2010 06:53 AM
Hi,
Here are some links that will help you into the troubleshooting process:
http://www.cisco.com/en/US/products/hw/routers/ps359/products_tech_note09186a00801c2af0.shtml
http://www.cisco.com/en/US/products/hw/routers/ps359/products_tech_note09186a00801c2af3.shtml
In addition to that, you can try capturing packets which are punted to the CPU with the sh buffer input-interface
Also you could activate netflow which will give you a list of all the flow going through the router. It may help you identify unexpected traffic. Finally show ip traffic will give you detailed statistics.
HTH
Laurent.
