From: Nick Griffin (nick.jon.griffin@gmail.com)
Date: Tue Dec 12 2006 - 02:06:40 ART
Perhaps someone has a clue why this happens, I would think this only should
happen on the switches with non-default "system mtu" command, however there
are circumstances when it happens with the default mtu.
On 12/11/06, Lab Rat #109385382 <techlist01@gmail.com> wrote:
>
> Yupas you scroll down you'll be seeing some more emails on the subjectJ
>
>
>
> However, you bring up a good pointI put the command on the opposing
> router interfaces. Does it work if I put it on the SVI (haven't tried
> yet)? I would think the point is that the SVI MTU is too big for the
> routers so it has to be placed there
>
>
>
> *From:* Nick Griffin [mailto:nick.jon.griffin@gmail.com]
> *Sent:* Monday, December 11, 2006 9:02 PM
> *To:* Lab Rat #109385382
> *Cc:* security@groupstudy.com; ccielab@groupstudy.com;
> cisco@groupstudy.com
> *Subject:* Re: SVI can't become an OSPF neighbor?
>
>
>
> have you tried "ip ospf mtu-ignore" on the SVI?
>
> On 12/11/06, *Lab Rat #109385382* <techlist01@gmail.com > wrote:
>
> Sorry if this is obvious to some, but for the life of me, I cannot figure
> it
> out...
>
> When I try to add a switch SVI subnet to the OSPF process, it will not
> neighbor up with the other 2 routers on the same subnet. I can see in the
> debug that it keeps trying to win the DR/BDR election (and eventually does
>
> due to highest IP address), but it will never establish with the other
> devices.
>
> The other 2 routers, in the meantime, work just fine until the switch is
> added (which is always stuck in EXSTART from the router
> perspective). Then,
> when the switch becomes the DR, the other routers will start losing their
> own neighborships with each other (obviously).
>
> What in the world am I doing here? I feel like I've done this scenario so
> many times in the past, and without complications...
>
> Is it me, or the equipment? :)
>
> Thanks,
>
> Ed
>
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