From: Hussam EL Kebbi (hussamkibbi@hotmail.com)
Date: Sun Feb 15 2009 - 15:52:35 ARST
Actually I was working on real network environment that I don't have access
now anymore.
I am only surprised that nothing worked when neighbors were flapping unless
when I put MTU equal to each others!!!
Does it have to do with LMI can't be fragmented or something? any idea?
The output error was (K-values mismtach).
> Date: Sun, 15 Feb 2009 10:44:12 -0500
> Subject: Re: EIGRP Neighbors Flapping b/c of mismatch MTU ?
> From: all.from.nj@gmail.com
> To: hussamkibbi@hotmail.com
> CC: ccielab@groupstudy.com
>
> A quick lab test:
>
> %DUAL-5-NBRCHANGE: IP-EIGRP(0) 100: Neighbor 1.1.1.1 (Serial0/0.1) is down:
> Insufficient MTU
>
> R3(config-if)#do sho debug
> IP routing:
> IP-EIGRP Neighbor Target Events debugging is on
> IP-EIGRP Route Events debugging is on
>
> I get this message when I tune the MTU to a very low value, but I was not
> able to get it when the MTU were only slightly different.
>
> Have you progressed through the lab to a point where other configs have
> caused problems? For EIGRP, slightly different MTU sizes should not matter
> much in the lab type environment.
>
> Any additional insight to what your configs look like might help / be fun
> for those of us wanting to lab test this along with you. I will be out for
> most of the day ... going snowboarding! ;-)
>
> andrew>
> andrew>en
> andrew#
> andrew# config brain
> andrew(wacky brain)# go snowboarding today
>
> Andrew Lee Lissitz
>
>
>
> On Sun, Feb 15, 2009 at 5:17 AM, Hussam EL Kebbi
<hussamkibbi@hotmail.com>wrote:
>
> > Hi Experts,
> >
> >
> >
> > I was working on a lab (EIGRP over Frame Relay) and I noticed that when
MTU
> > is
> > different between neighbors
> >
> > it starts flapping, but when I changed MTU to same on both neighbor
> > interfaces, it works just fine.
> >
> >
> >
> > Any idea why?
> >
> >
> >
> >
> >
> > Thank You,
> >
> > Hussam
> >
> >
> >
> >
> >
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> --
> Andrew Lee Lissitz
> all.from.nj@gmail.com
>
>
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