Hi Hari,
Why dot you use broadcast storm config on interface if you think that’s an issue.
Please see this link for troubleshooting
http://www.cisco.com/en/US/products/hw/routers/ps359/products_tech_note09186a00801c2af3.shtml
You can use sho process cpu | exe 0.00
this will filter the process and show you only process which are using the cpu.
The use
Sho process cpu sort 5 sec
Keep repeating it for some time and see if the same process is causing cpu high utilisation. Then start troubleshooting from there.
Please rate if this helps
thanks