CISCO2821 facing high CPU utilisation due to interrupt value

[HCL Support]

Hi Team,

We having the Cisco 2821 Router installed at the Custome rsite & reported the high CPU utilisation that showing high percentage of interrupt so need the suggetion on the case.Attaching here the show version, show process cpu sorted, show process cpu history, show process cpu | exec 0.00, show logging for further analyze the case & suggest us on the same.

MPLSTRVRTR001#sh processes cpu | exclude 0.00%  0.00%  0.00%
CPU utilization for five seconds: 99%/98%; one minute: 92%; five minutes: 89%
 PID Runtime(ms)     Invoked      uSecs   5Sec   1Min   5Min TTY Process
   2       34136        7714       4425  2.15%  2.16%  1.88%   0 Load Meter      
   5      164892       10239      16104  0.15%  0.13%  0.15%   0 Check heaps     
  11       55288         509     108620  0.00%  0.04%  0.04% 514 SSH Process     
  29       73172       12468       5868  0.07%  0.12%  0.11%   0 ARP Input       
  47        8820       10108        872  0.00%  0.01%  0.00%   0 Net Background  
  50        5112       38369        133  0.00%  0.01%  0.00%   0 TTY Background  
  51         112        2573         43  0.00%  0.01%  0.00%   0 c2800 Periodic  
  64       50944        1398      36440  0.00%  0.04%  0.00%   0 Per-minute Jobs 
  65      177480       38645       4592  0.39%  0.53%  0.39%   0 Per-Second Jobs 
 107        9932      235015         42  0.07%  0.05%  0.00%   0 Ethernet Timer C
 108       79860     4775884         16  0.47%  0.33%  0.34%   0 Ethernet Msec Ti
 131       28968     1177853         24  0.07%  0.10%  0.08%   0 IPAM Manager    
 135      112524       22181       5072  0.07%  0.22%  0.25%   0 IP Input        
 147       11856      149957         79  0.07%  0.01%  0.00%   0 SSS Feature Time
 161       24156       57669        418  0.07%  0.03%  0.02%   0 CEF: IPv4 proces
 186       38376        6753       5682  0.00%  0.07%  0.07%   0 ADJ resolve proc
 254       10640      191581         55  0.07%  0.01%  0.00%   0 Atheros LED Ctro
 269       16260       38357        423  0.00%  0.01%  0.02%   0 OSPF-100 Router 
 298       14260       38647        368  0.00%  0.01%  0.00%   0 NTP             
 302       53232         303     175683  0.00%  0.03%  0.05%   0 SNMP ENGINE     
 308       40112       38564       1040  0.07%  0.00%  0.02%   0 OSPF-628 Router 
 312       17412        2305       7554  0.07%  0.02%  0.01%   0 OSPF-628 Hello 

Regards,

Ashutosh

[Philip D'Ath]

Is CEF enabled?

Are you doing any policy routing?

What is the combined total of throughput of all interfaces, in and out of the router?

Actually, can you just post the config?

[Joseph W. Doherty]

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Posting

What is the combined total of throughput of all interfaces, in and out of the router?

What Philip is asking, if often the cause of high interrupt CPU, i.e. ISRs have a finite forwarding capacity.

Configuration options, can add to the load.  Which is why he asks the other questions.

On later IOS versions, I believe fragmentation is handled in the fast path (i.e. interrupt processed), so if that's happening, your CPU load will often be much increased.