Re: Disable CEF in 3560

I am reading older threads and decided to respond to this one. You cannot
disable CEF on switching platforms. You can disable CEF on routing
platforms. Process switching can occur on both routers and swtiches however
if CEF is enabled and data packets not intended for the device are being
process switched then it should be investigated. You can tell if traffic is
being process switched by using "show ip traffic" Also if you type "show
proc cpu" and ip input is consuming high cpu cycles then you should
investigate into why.

Steve Lyons

On Thu, May 21, 2009 at 8:36 AM, Pavel Bykov <slidersv_at_gmail.com> wrote:

> Hello Anbu.
> To simplify, since 3560 is a hardware platform, the only way to stop cef is
> with a screwdriver and a hammer.
> 3560 does not have chips and ASICs for the other forms of forwarding.
> There are special cases, like IP options that have to be processed by CPU
> and so on, but it's done using CEF punt actions.
>
> On Thu, May 21, 2009 at 12:40 PM, Anbu <ksanpu_at_gmail.com> wrote:
>
> > Hi all
> > Here i have an issue in CEF configured on 3560 , i hanve
> configured
> > two switches ( 3560 & 3750) to check CEF. both switches connected by a L3
> > link and CEF enabled.
> > then i have tried to stop cef , but cannot stop in config mode as it is
> > 3560
> >
> > SW1(config)#no ip cef distributed
> > %Cannot disable CEF on this platform
> >
> > so have stoped all the interfaces
> >
> > SW1(config-if)#no ip route-cache cef
> >
> > all the cef entries are there even i have cleared all , and restart the
> > switch.
> >
> > *All this issues are in 3560 only*
> >
> > So i am expecting advice to overcome that.
> >
> > Regards,
> > Anbu
> >
> >
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>
> --
> Pavel Bykov
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Received on Fri Sep 11 2009 - 19:17:23 ART