High CPU

Unanswered Question
Apr 27th, 2007

Hi Guys,

Our Customer have one 7600 that is presenting problem of performance. When I type "show proc cpu sorted" in the interface GE-WAn display the process "CEF Scanner" in 60%. What it is this process? which is its affectation?

I have this problem too.
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Danilo Dy Sun, 04/29/2007 - 07:01


What is your IOS version? Please post "show version" output.

CEF Scanner process computes new L2 adjacency when there is a MAC rewrite.


wilsonsant Wed, 05/02/2007 - 04:12

Hi Dandy,

It follows below the show version

The version is 12.2(18)SXF4

Thank You,


guruprasadr Sun, 04/29/2007 - 23:12

HI Wilson, [Pls Rate if Helps ! !]

We too had the same problem of over loaded CPU of 7206 VXR Router upto 85% in a Site.

After several Investigations, we already had "Netflow" implemented in our Routers. Noticed that Several Client IP's in BO has communicated to single IP in HO for particular service & initiated more than 1000 IP sessions. This made the CPU Load go High upto 85%

So, without any best analyser like "Netflow" you will not be able to Investigate & Identify the Root Cause for this Situation.

Pls Rate If Helps ! !

Best Regards,

Guru Prasad R

mohammedmahmoud Wed, 05/02/2007 - 04:46


I add my voice to Guru, enable Netflow on the interface and try to investigate any malicious traffic.

interface x

ip route-cache flow

and then do "sh ip cache flow".

HTH, please rate if it does help,

Mohammed Mahmoud.


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