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New Member

High CPU due to " IP SNMP " & " SNMP ENGINE "

Hi All,

I have a Cisco 2851 router which placed on one of our company node. Currently it's handling 80M of traffic. Recently ?I have monitor increased in CPU due to SNMP. Appreciate if someone can help me with this ??

 

Following are the Logs taken from the router.

 

Router Version:-

"flash:c2800nm-adventerprisek9-mz.151-4.M8.bin"

 

2851# show proc cpu sorted
CPU utilization for five seconds: 84%/64%; one minute: 86%; five minutes: 75%
 PID Runtime(ms)     Invoked      uSecs   5Sec   1Min   5Min TTY Process
 378     5408556    11245357        480  5.83%  6.46%  3.89%   0 IP SNMP          
 380     4739792     5616341        843  5.43%  6.49%  3.94%   0 SNMP ENGINE  
    
 142     3982236     8455561        470  3.67%  3.93%  2.80%   0 IP Input         
 379      936308     5615860        166  1.11%  1.25%  0.77%   0 PDU DISPATCHER   
 366      747504      735117       1016  0.71%  0.48%  0.49%   0 MRIB Trans       
 116       11196    14099948          0  0.55%  0.57%  0.55%   0 Ethernet Msec Ti
 371      170552      782130        218  0.39%  0.27%  0.26%   0 MFIB_mrib_read   
 203      791500      983787        804  0.31%  0.38%  0.39%   0 ADJ resolve proc
 370       10484     5557602          1  0.31%  0.27%  0.26%   0 MFIB_mrib_write  
 364      232568     2761087         84  0.23%  0.26%  0.25%   0 PIM Process      
   2       70272       22341       3145  0.07%  0.06%  0.07%   0 Load Meter       
 189        9672      290274         33  0.07%  0.08%  0.07%   0 TCP Timer        
 313         920      558364          1  0.07%  0.02%  0.00%   0 Atheros LED Ctro
 262       20168      140738        143  0.07%  0.01%  0.00%   0 OSPF-10 Router   
 106         568      111651          5  0.07%  0.00%  0.00%   0 COLLECT STAT COU
 177        9160      151130         60  0.07%  0.07%  0.07%   0 CEF: IPv4 proces
 289        6344     3487573          1  0.07%  0.07%  0.07%   0 MMON MENG        
 282       59712      223334        267  0.07%  0.06%  0.07%   0 BGP Router       
 372        8436       13966        604  0.07%  0.01%  0.00%   0 MFIB_rate        
 363        7600     1132583          6  0.07%  0.06%  0.07%   0 IGMP Input      

 

set-2851#show snmp stats oid

time-stamp               #of times requested             OID
09:16:28 LK Nov 10 2014  327                     ifDescr
09:16:27 LK Nov 10 2014  398                     ifName
09:16:26 LK Nov 10 2014  396                     ifPhysAddress
09:16:26 LK Nov 10 2014  2                       ifLastChange
09:16:26 LK Nov 10 2014  2                       ifOperStatus
09:16:25 LK Nov 10 2014  548                     ipAddrEntry.2
09:16:23 LK Nov 10 2014  528                     ifType
09:16:09 LK Nov 10 2014  1                       internet.6.3.12.1.1
09:16:09 LK Nov 10 2014  1                       internet.6.3.11.2.1.3
09:16:09 LK Nov 10 2014  1                       internet.6.3.11.2.1.2
09:16:09 LK Nov 10 2014  1                       internet.6.3.11.2.1.1
09:16:09 LK Nov 10 2014  1                       internet.6.3.10.2.1.4
09:16:09 LK Nov 10 2014  1                       internet.6.3.10.2.1.3
09:16:09 LK Nov 10 2014  1                       internet.6.3.10.2.1.2
09:16:09 LK Nov 10 2014  1                       internet.6.3.10.2.1.1
09:16:09 LK Nov 10 2014  2                       internet.6.3.1.1.6.1
09:16:09 LK Nov 10 2014  1                       cbQosCMPrePolicyByte
09:16:09 LK Nov 10 2014  2                       cbQosCMPrePolicyByteOverflow
09:16:09 LK Nov 10 2014  1                       cbQosCMPrePolicyByteOverflow
09:16:09 LK Nov 10 2014  1                       cbQosCMPrePolicyByteOverflow
09:16:09 LK Nov 10 2014  5                       cbQosCMPrePolicyPkt64
09:16:09 LK Nov 10 2014  1                       cbQosPolicyMapDesc
09:16:09 LK Nov 10 2014  3                       cbQosPolicyMapName
09:16:09 LK Nov 10 2014  12                      cbQosParentObjectsIndex
09:16:09 LK Nov 10 2014  10                      cbQosObjectsType
09:16:09 LK Nov 10 2014  1                       cbQosObjectsType
09:16:09 LK Nov 10 2014  1                       cbQosObjectsType
09:16:09 LK Nov 10 2014  13                      cbQosConfigIndex

4 REPLIES
New Member

Any Help ???

Any Help ???

Hi there,looking at your

Hi there,

looking at your process stats of the 84% util, 64% of that is due to CPU interupts. The SNMP process being high up the list is a red herring. You should investigate what traffic is being sent to the CPU for processing.

Following the steps in these documents should aid in troubleshooting:

http://www.cisco.com/c/en/us/support/docs/routers/10000-series-routers/15095-highcpu.html

http://www.cisco.com/c/en/us/support/docs/routers/7500-series-routers/41120-highcpu-interrupts.html

 

cheers,

Seb.

New Member

Thanks Seb !!! But when I

Thanks Seb !!!

 

But when I disable snmp-server community XXXX RO CPU utilization get down to 35 -40%... I suspected that one of my servers which using snmp to collect data may causing this problem... Any Ideas ????

New Member

Taking a look you can see

Taking a look you can see that the OIDs being polled the most are:

 

09:16:25 LK Nov 10 2014  548                     ipAddrEntry.2
09:16:23 LK Nov 10 2014  528                     ifType

 

So you can either check the monitoring tool using that community and increase the polling intervals or set a view to those OIDs.

Those are huge OIDs so it is expected that being polled a lot cause high cpu, on this case it is weird as they only have 5%, that is not high cpu at all, you can check the show process cpu history, I think about a bug showing wrong information on the processes.

 

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