Cisco 6509 Modular IOS high cpu utilization

[cssam]

Hi all,

Cisco 6509 modular IOS getting high cpu in interrupt but the switch process switching is still less. Any sugeestion what could be the problem?

Process sbin/ios-base, type IOS, PID = 16407
CPU utilization for five seconds: 12%/81%;

Sometimes cpu goes upto 100%

Version - s72033-ipservicesk9_wan-vz.122-33.SXH5

[phiharri]

Greetings,

The following CSC doc covers the netdr tool to identify traffic being sent to the CPU which is the most common cause for interrupt utilization: https://supportforums.cisco.com/docs/DOC-14086

Follow this process while the CPU utilization is raised to identify trends in the packets which aren't being software switched:

debug netdr clear
debug netdr cap rx
(wait a few seconds)
undebug all

sh netdr cap | i int
Is there one interface receiving the majority of traffic? If so - any config/feature on that interface that could require software switching (SLB, PBR, NAT, WCCP, ACL with log etc)?

sh netdr cap | i ttl
Is there an excess of traffic with TTL 1?
Are there some common destination IP/subnets?

sh netdr cap | i dest_indx
How many of the capture lines have 'flood 1' set?
What are the most common dest_indx value?

Kind Regards,

/Phil

[Edison Ortiz]

Any reason for running modular IOS?

[cssam]

Hi Phil,

I will check command outputs and update you.

hi Edison,

it came along with new cisco 6500 box. We do not have any specific reason.

[f.aoun]

How this matter is solved?

Was it related to any IOS bug such CSCsr12976