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Cisco IOU High CPU Usuage

Hello Experts,

I use Cisco IOU provided by flyxy.cn at http://91sec.blogspot.co.uk/2014/03/my-cisco-iou-racks-from-flyxj-iouv3.html

The Cisco L2 IOU 12 causes a lot of CPU usage causes high CPU usage. The high CPU usage is System not Users: more debugging shows that L2 IOU causes a lot of loopback traffic. It was suggested to use the following commands:

class-map match-all ARP
  match protocol arp

policy-map ARP-limit
  class ARP
   police rate 2 pps burst 20 packets peak-rate 7 pps
     conform-action transmit
     exceed-action drop
     violate-action drop


However, I don't see where to apply to policy. Can someone shed some light


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1 Solution
PredragNetwork EngineerCommented:
Most likely you should apply it on loopback interface (since it is loopback traffic)  :)

interface loopback0
service-policy output ARP-limit

Most likely you need to restrict traffic from loopback in out direction,.
Steven RomanCommented:

This is still going to use processing to try to limited the traffic

Try to determine why this is going on.  ARP could be MAC address flooding on your IOU Lab.

If that does not show any thing try GNS3 or Cisoc VIRL

Hope this helps.

Member_2_7966113Author Commented:
Hello Steven

Does Cisco VIRL do switching?

Nothing ever in the clear!

This technical paper will help you implement VMware’s VM encryption as well as implement Veeam encryption which together will achieve the nothing ever in the clear goal. If a bad guy steals VMs, backups or traffic they get nothing.

PredragNetwork EngineerCommented:
Yes, but you need to pay for it. Check prices on Virl page.
Member_2_7966113Author Commented:
Hi Steven,

I've just checked out Cisco VIRL, its not for me.

Member_2_7966113Author Commented:
Thanks for responding. That solved the problem

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