From: Patrick Torney (ptorney@satx.rr.com)
Date: Thu Jul 15 2004 - 14:28:25 GMT-3
While the system mtu does fix the issue... you could have also done:
ip ospf mtu-ignore
on the interface in question.
HTH.
----- Original Message -----
From: "Fernando Rodriguez" <fernanrl@yahoo.com>
To: <samccie2004@yahoo.co.uk>; <barrerj1@hotmail.com>;
<ccielab@groupstudy.com>
Sent: Monday, July 05, 2004 3:44 AM
Subject: RE: OSPF MTU problem
> 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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>
>
>
>
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