Re: EIGRP Neighbors Flapping b/c of mismatch MTU ?

From: ALL From_NJ (all.from.nj@gmail.com)
Date: Sun Feb 15 2009 - 13:44:12 ARST

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

Blogs and organic groups at http://www.ccie.net

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