From: Fernando Rodriguez (fernanrl@yahoo.com)
Date: Mon Jul 05 2004 - 05:44:23 GMT-3
Hi there,
I had the same problem. I checked everywhere to find
almost no solution. At the end I checked the mtu size
and saw that the mtu size by default in the 3550s was
different (???). I did "system mtu 1500" in my 3550s,
rebooted and everything is fine ever since. Regards,
Fernando
--- samccie2004@yahoo.co.uk escribis: > Are iu
trunking , if so u might be adding more to
> MTU due to dot1q.
>
> Just a guess, pls correct me if I am wrong.
>
> Sam
>
> -----Original Message-----
> From: nobody@groupstudy.com
> [mailto:nobody@groupstudy.com]On Behalf Of
> barrerj1@hotmail.com
> Sent: 03 July 2004 13:26
> To: ccielab@groupstudy.com
> Subject: OSPF MTU problem
>
>
> Hi all!
>
>
>
> While doing an OSPF practice lab, I was encountered
> by the following
> problem.
>
>
>
> 2 routers connected to a 3550 and running OSPF
> between them, the state
> was stuck in EXSTART and couldn't complete the
> adjacency.
>
>
>
> I checked CCO and found that the problem was an MTU
> mismatched.
> However, the CCO doc points this problem to be a
> common when you connect
> to another vendor's router. In my case all devices
> are CISCO.
>
>
>
>
>
>
>
>
> Neighbors Stuck in Exstart/Exchange State
>
>
> The problem occurs most frequently when attempting
> to run OSPF between a
> Cisco router and another vendor's router. The
> problem occurs when the
> maximum transmission unit (MTU) settings for
> neighboring router
> interfaces don't match. If the router with the
> higher MTU sends a packet
> larger that the MTU set on the neighboring router,
> the neighboring
> router ignores the packet.
>
>
http://www.cisco.com/en/US/tech/tk365/tk480/technologies_tech_note09186a
> 0080093f0d.shtml
>
>
>
>
>
>
>
> Can any one explain why this behavior as I did not
> change any of the MTU
> configurations before the problem occurred?
>
>
>
>
>
> Thanks
>
> JB
>
>
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