Cisco 7206 VXR high CPU utilization due to Interrupt's

[network.jithin]

Hi,

Im having a cisco 7206 VXR router which is having high CPU utilization due to interrupt. The attached is the  logs of the device.

Can Anyone let me know the cause of this issue.

[Joseph W. Doherty]

Disclaimer

The     Author of this posting offers the information contained within this     posting without consideration and with the reader's understanding  that    there's no implied or expressed suitability or fitness for any   purpose.   Information provided is for informational purposes only and   should not   be construed as rendering professional advice of any kind.   Usage of  this  posting's information is solely at reader's own risk.

Liability Disclaimer

In     no event shall Author be liable for any damages whatsoever   (including,   without limitation, damages for loss of use, data or   profit) arising  out  of the use or inability to use the posting's   information even if  Author  has been advised of the possibility of  such  damage.

Posting

Normally, interrupt CPU represents the router forwarding packets through its fast path.

What's the aggregate bandwidth that's being processed when the interrupt CPU is high?

If the interrupt CPU just occasional spikes or sustained?  (I.e. what's the CPU history stats?)

[network.jithin]

Hi,

Current aggregate b.w is 500 mpbs..   and the attached is the logs of cpu histroy

CS-7206VXR# show cpu hist

888888888888888888888888877777888888888888888888888888888888

111110000033333000001111199999222221111155555000001111100000

100

90 *****

80 ************************************************************

70 ************************************************************

60 ************************************************************

50 ************************************************************

40 ************************************************************

30 ************************************************************

20 ************************************************************

10 ************************************************************

0....5....1....1....2....2....3....3....4....4....5....5....6

0 5 0 5 0 5 0 5 0 5 0

CPU% per second (last 60 seconds)

888888888888778877888888888888877888888888788888888888787778

530431350433870088122221243230389840143311913010254236919663

100

90 * * * * *

80 ################################################*######*#**#

70 ############################################################

60 ############################################################

50 ############################################################

40 ############################################################

30 ############################################################

20 ############################################################

10 ############################################################

0....5....1....1....2....2....3....3....4....4....5....5....6

0 5 0 5 0 5 0 5 0 5 0

CPU% per minute (last 60 minutes)

* = maximum CPU% # = average CPU%

888887533232243333579899888887523223343222222222322222222222222222222233

829689720638641398740602919976270624412887946774176788954346124841648635

100

90 * *** ***** ***

80 #*##** *####*##**

70 #####* *#########*

60 ######* **#########*

50 ######* *###########*

40 ######* * **############* * *

30 #######******#***##############*** **#***** *** ******** * * * ****

20 #################################**########***###*#********#******#*####

10 ########################################################################

0....5....1....1....2....2....3....3....4....4....5....5....6....6....7..

0 5 0 5 0 5 0 5 0 5 0 5 0

CPU% per hour (last 72 hours)

* = maximum CPU% # = average CPU%

[skarthic]

Hi Jithin,

Looking at the o/ps, I see the CPU spike started a day ago. The o/ps attached shows the total traffic through the router was 50Mbps when the o/p was taken and the CPU was 77%.

Can you confirm what is the current throughput on the router? Were there any changes made recently in last few days that could have caused the issue?

Is it possible to post a running config (with IPs removed if needed). Was there any new configurations made recently?

Thanks.