I think the best answer is to try 12.0(13)S and see if it works for you.
Scanning the bug database shows a relatively large number of CEF related
bugs that are only fixed in 12.0(13) or 12.1(3)[ET] releases.
Maybe somebody at Cisco did some house cleaning or maybe it's just an
illusion, but there are bugs in earlier releases that may make your
life difficult try to use CEF on a 75xx router.
Some of these bugs are of the type where you can't get it to work
reliably at all, others where doing certain acts will make it fail
and other were everything is fine for a long time, and then it
stops working.
The usually symptom is 1-of-n packets being dropped !.!.!.!.!, but
it can get worse...
12.0(13)S has been out a while and no horror stories have surfaced,
which means there's a good chance that it's not a turkey. If you
don't care about CEF, then 12.0(7)S and 12.0(9)S were ok, and just
off the bleeding edge 12.0(11.3)S works.
Opinions and experiences may differ, after N-cycles of "maybe CEF
will work this time" it gets a bit wearying...
George
> From cisco-nsp-request@puck.nether.net Fri Oct 20 20:43:55 2000
> Resent-Date: Fri, 20 Oct 2000 20:40:30 -0400
> Received-Date: Fri, 20 Oct 2000 20:38:56 -0400
> From: "Michael K. Smith" <mksmith@semaphore.com>
> To: cisco-nsp@puck.nether.net
> Subject: RE: [nsp] cef problem in 7500
> Date: Fri, 20 Oct 2000 17:38:50 -0700
> Resent-From: cisco-nsp@puck.nether.net
> X-Mailing-List: <cisco-nsp@puck.nether.net> archive/latest/4125
> X-Loop: cisco-nsp@puck.nether.net
> Precedence: list
> Resent-Sender: cisco-nsp-request@puck.nether.net
>
> Hi Man:
>
> I don't offhand. I was going to upgrade into the latest in the 12.0.xS
> train and see if that helps. I've heard quite a bit about this problem in
> various venues, so I don't think it's resolved. I just disable and
> re-enable CEF every time I work on the interfaces. Not the prettiest thing
> around but it does the trick.
>
> Mike
>
> -----Original Message-----
> From: Cho Man Fai [mailto:mfcho@hknet.com]
> Sent: Friday, October 20, 2000 5:29 PM
> To: Michael K. Smith
> Cc: cisco-nsp@puck.nether.net
> Subject: RE: [nsp] cef problem in 7500
>
>
>
> Hi Mike,
>
> The problem didn't appear immediately after the removal of ISL
> subinterface for this case, but around 20 mins later... Is it IOS bug? Do
> you know any much stable 12.0 or 12.1 IOS for 7500?
>
> Rgds,
> Kenneth Cho
>
> On Fri, 20 Oct 2000, Michael K. Smith wrote:
>
> > I have experienced the same issues using 12.0.9S, seemingly related to
> > removing ISL sub-interfaces on a fast ethernet port.
> >
> > Mike
> >
> > -----Original Message-----
> > From: Cho Man Fai [mailto:mfcho@hknet.com]
> > Sent: Friday, October 20, 2000 5:09 PM
> > To: cisco-nsp@puck.nether.net
> > Subject: [nsp] cef problem in 7500
> >
> >
> >
> > Dear all,
> >
> > We are expriencing cef problem in 7500 for serveral times with IOS
> > 12.0(7)T which cause routing problem in the 7500 box. The problems were
> > fixed by disabling and enabling the cef everytime.
> >
> > Do you experience the same problem with this IOS? Is there a "more" stable
> > 12.0 or 12.1 IOS version which you'd recommend?
> >
> > Thanks in advance.
> >
> > Rgds,
> > Kenneth Cho
> >
>
>
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