Re: IP cef

Does anyone have a good document explaing which services rely on ip cef and
ipv6 cef.

I found one here which is useful but more specific to QoS:
http://www.cisco.com/en/US/tech/tk39/tk824/technologies_tech_note09186a0080094978.shtml
thanks in advance &
^Kind regards$

On 12 February 2013 17:09, Marko Milivojevic <markom_at_ipexpert.com> wrote:

> There is not, no.
>
> --
> Marko Milivojevic - CCIE #18427 (SP R&S)
> Senior CCIE Instructor / Managing Partner - IPexpert
>
> On Tue, Feb 12, 2013 at 9:06 AM, Tauseef Khan <tasneemjan_at_googlemail.com>
> wrote:
> > Thanks all for a good discussion. another question on ip cef is that
> when I
> > enable <ip cef distributed> and <ip routing>, I don't see ip cef in
> output
> > of <sh run> or <show run all> on 3550 / 3650 / 3760 switching platforms.
> I
> > know that ip cef is running on these platforms by default as soon as I
> > enable ip routing. Is there any way of disabling ip cef on switches?
> >
> >
> > Kind regards
> >
> > On 9 February 2013 01:34, marc edwards <renorider_at_gmail.com> wrote:
> >>
> >> Thanks for clarifying Marco. I'm a little red in the face making that
> >> mistake.
> >>
> >> On Fri, Feb 8, 2013 at 4:53 PM, David Prall <dcp_at_dcptech.com> wrote:
> >> > After the MFI rewrite there is no Fast Path, you get either CEF or
> >> > Process Switching. So 12.4(20)T and beyond are hard pressed to run
> without
> >> > "ip cef" enabled.
> >> >
> >> > --
> >> > http://dcp.dcptech.com
> >> >
> >> >
> >> >> -----Original Message-----
> >> >> From: nobody_at_groupstudy.com [mailto:nobody_at_groupstudy.com] On
> >> >> Behalf Of Marko Milivojevic
> >> >> Sent: Friday, February 08, 2013 7:43 PM
> >> >> To: marc edwards
> >> >> Cc: Keller Giacomarro; Mohammad Mousa; Tauseef Khan; Cisco
> >> >> certification
> >> >> Subject: Re: IP cef
> >> >>
> >> >> MPLS control plane does not require CEF. It's the MPLS forwarding
> >> >> plane that requires it. It makes up for an interesting
> troubleshooting
> >> >> :-).
> >> >>
> >> >> Things change between IOS versions and behave differently on
> different
> >> >> platforms, but I recall that uRPF also needed CEF to work. I'm
> >> >> positive that ZBF needs it, as well (never tried it with CEF off
> >> >> though - feel free). On switches for example, you cannot turn CEF off
> >> >> if you have "ip routing" enabled, as it requires CEF to work.
> >> >>
> >> >> --
> >> >> Marko Milivojevic - CCIE #18427 (SP R&S)
> >> >> Senior CCIE Instructor / Managing Partner - IPexpert
> >> >>
> >> >> On Fri, Feb 8, 2013 at 4:36 PM, marc edwards <renorider_at_gmail.com>
> >> >> wrote:
> >> >> > Marko,
> >> >> >
> >> >> > Thanks for chiming in. I am interested to know what other control
> >> >> > protocols on blue print rely on CEF aside from MPLS?
> >> >> >
> >> >> > Marc
> >> >> >
> >> >> > On Fri, Feb 8, 2013 at 3:39 PM, Marko Milivojevic
> >> >> > <markom_at_ipexpert.com>
> >> >> wrote:
> >> >> >> What if "ip routing" was disabled on routers? How about if escape
> >> >> >> character was set to "space", etc? Paranoia, or "I'll always do
> >> >> >> this
> >> >> >> in a case they're playing games" will not get you very far in the
> >> >> >> lab
> >> >> >> :-).
> >> >> >>
> >> >> >> I recommend you do what's needed, no less, no more. If CEF is
> turned
> >> >> >> off, turn it on if you need it, otherwise, why do you care if it
> was
> >> >> >> turned off? :-)
> >> >> >>
> >> >> >> --
> >> >> >> Marko Milivojevic - CCIE #18427 (SP R&S)
> >> >> >> Senior CCIE Instructor / Managing Partner - IPexpert
> >> >> >>
> >> >> >> On Fri, Feb 8, 2013 at 1:30 PM, Keller Giacomarro
> >> >> >> <keller.g_at_gmail.com>
> >> >> wrote:
> >> >> >>> I have a pre-defined set of commands I run on all my
> configuration-
> >> >> section
> >> >> >>> devices before I start the section.
> >> >> >>>
> >> >> >>> ***
> >> >> >>> ip cef (doesn't work on switches without 'ip routing' enabled)
> >> >> >>> ip classless
> >> >> >>> ip subnet-zero
> >> >> >>> ***
> >> >> >>>
> >> >> >>> My logic is -- If any of these are disabled, it's most likely
> going
> >> >> >>> to be a
> >> >> >>> purposeful 'break' that you have to fix. If they want them to
> stay
> >> >> >>> disabled, they'll tell you in the questions. Either way, it
> >> >> >>> doesn't hurt
> >> >> >>> you to run all three by default on all devices.
> >> >> >>>
> >> >> >>> One that I DON'T run is 'ip routing'. It's not a given that all
> >> >> >>> switches
> >> >> >>> will be running routing protocols, and when you enable IP routing
> >> >> >>> it
> >> >> >>> disables the default-gateway, which means adding a static route.
> >> >> >>> This is
> >> >> >>> probably not allowed in your lab.
> >> >> >>>
> >> >> >>> I have another tip for the troubleshooting section. I put this
> >> >> >>> text into
> >> >> >>> notepad and copy-paste it into every device I open as I open
> them.
> >> >> >>>
> >> >> >>> ***
> >> >> >>> conf t
> >> >> >>> logging con debug
> >> >> >>> end
> >> >> >>> copy running-config nvram:original.cfg
> >> >> >>>
> >> >> >>> n
> >> >> >>>
> >> >> >>>
> >> >> >>> ***
> >> >> >>>
> >> >> >>> First, this ensures I can see all logging outputs. If it's the
> >> >> >>> first time
> >> >> >>> I've accessed the device, the config is backed up to
> >> >> >>> nvram:original.cfg,
> >> >> >>> and the 'n' will be an invalid command. If it's NOT the first
> time
> >> >> >>> I've
> >> >> >>> accessed the device, the newline and the n means original.cfg
> will
> >> >> >>> NOT
> >> >> get
> >> >> >>> overwritten (answers 'no' to 'do you want to overwrite'). I save
> >> >> >>> to
> >> >> nvram:
> >> >> >>> instead of flash: just in case their IOU instances do not have a
> >> >> >>> flash --
> >> >> >>> all devices have nvram.
> >> >> >>>
> >> >> >>> A quick 'end' and then 'wr' before I close ANY window ensures
> that
> >> >> >>> all
> >> >> my
> >> >> >>> work gets saved too.
> >> >> >>>
> >> >> >>> This works great for me, what is your strategy?
> >> >> >>>
> >> >> >>> Keller Giacomarro
> >> >> >>> keller.g_at_gmail.com
> >> >> >>>
> >> >> >>>
> >> >> >>> On Fri, Feb 8, 2013 at 11:34 AM, marc edwards <
> renorider_at_gmail.com>
> >> >> wrote:
> >> >> >>>
> >> >> >>>> I can think of at least one control protocol on the blueprint
> that
> >> >> >>>> won't work w/out CEF (MPLS). Can anyone else add to the list?
> >> >> >>>>
> >> >> >>>> Marc
> >> >> >>>>
> >> >> >>>> On Fri, Feb 8, 2013 at 8:03 AM, Mohammad Mousa <mohd-
> >> >> mousa_at_hotmail.com>
> >> >> >>>> wrote:
> >> >> >>>> > Tauseef,
> >> >> >>>> >
> >> >> >>>> > I think you've to enable them, because some of the services
> >> >> >>>> > won't
> >> >> work
> >> >> >>>> well unless you enable IP CEF/IPV6 CEF, and I think you won't
> get
> >> >> >>>> the
> >> >> >>>> complete mark unless you put these commands.
> >> >> >>>> >
> >> >> >>>> > HTH,
> >> >> >>>> >
> >> >> >>>> > -Mohammad Mousa
> >> >> >>>> > CCIE #36990
> >> >> >>>> >
> >> >> >>>> >> Date: Fri, 8 Feb 2013 15:33:50 +0000
> >> >> >>>> >> Subject: IP cef
> >> >> >>>> >> From: tasneemjan_at_googlemail.com
> >> >> >>>> >> To: ccielab_at_groupstudy.com
> >> >> >>>> >>
> >> >> >>>> >> If in the lab ip cef is disabled on the routers and I enable
> ip
> >> >> >>>> >> cef /
> >> >> >>>> ipv6
> >> >> >>>> >> cef on routers, will I lose marks for that, as over
> >> >> >>>> >> configuration.
> >> >> >>>> Without
> >> >> >>>> >> ip cef every thing will be process switched but still all the
> >> >> >>>> >> routing
> >> >> >>>> will
> >> >> >>>> >> work as normal. Appreciate if someone could explain?
> >> >> >>>> >> Regards
> >> >> >>>> >>
> >> >> >>>> >>
> >> >> >>>> >> Blogs and organic groups at http://www.ccie.net
> >> >> >>>> >>
> >> >> >>>> >>
> >> >> ___________________________________________________________________
> >> >> ____
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> >> >> >>>> >
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> >> >> >>>> >
> >> >> >>>> >
> >> >> ___________________________________________________________________
> >> >> ____
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> >> >> >>>>
> >> >> >>>>
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> >> >> >>>>
> >> >> >>>>
> >> >> ___________________________________________________________________
> >> >> ____
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> >> >> >>>
> >> >> >>>
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> >> >> >>>
> >> >> >>>
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> >> >>
> >> >>
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> >> >>
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> >> >
> >> >
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Received on Sat Feb 16 2013 - 00:18:58 ART