High CPU

wilsonsant · ‎04-27-2007

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?

Danilo Dy · ‎04-29-2007

Hi,

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

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

Dandy

wilsonsant · ‎05-02-2007

Hi Dandy,

It follows below the show version

The version is 12.2(18)SXF4

Thank You,

Wilson

Danilo Dy · ‎05-02-2007

Hi,

There's multiple problem with that IOS including high CPU util, not CEF Scanner though but I recommend you upgrade your IOS first.

http://www.cisco.com/en/US/products/products_security_advisory09186a00807f413e.shtml

Dandy

guruprasadr · ‎04-29-2007

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 · ‎05-02-2007

Hi,

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.