Re: IP cef

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
> >>
> >>
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Received on Fri Feb 08 2013 - 15:30:29 ART