From: Scott Morris (swm@emanon.com)
Date: Tue Dec 12 2006 - 02:28:57 ART
Oftentimes on your switches, they have a system mtu of 1518, and OSPF seems
to pick up on that. In the end MTU mismatches in the startup, and MTU is
one of the requirements per RFC that must match to form a peer.
Easiest way around it is to use "ip ospf mtu-ignore" and things will be
easier! :)
All but a part of the myriad of exciting things to work through and see
happening before the "OH!" bulb goes on. Hopefully that occurs BEFORE the
lab exam! (grin)
Scott Morris, CCIE4 (R&S/ISP-Dial/Security/Service Provider) #4713, JNCIE
#153, CISSP, et al.
CCSI/JNCI-M/JNCI-J
IPExpert VP - Curriculum Development
IPExpert Sr. Technical Instructor
smorris@ipexpert.com
http://www.ipexpert.com
-----Original Message-----
From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
yousef mohammed
Sent: Tuesday, December 12, 2006 12:12 AM
To: Lab Rat #109385382
Cc: Kal Han; security@groupstudy.com; ccielab@groupstudy.com;
cisco@groupstudy.com
Subject: Re: SVI can't become an OSPF neighbor?
what was the solution?????
On 12/12/06, Lab Rat #109385382 <techlist01@gmail.com> wrote:
>
> Thanks, everyone.Scott beat you all to it.J
>
>
>
>
>
> From: Kal Han [mailto:calikali2006@gmail.com]
> Sent: Monday, December 11, 2006 7:41 PM
> To: Lab Rat #109385382
> Cc: security@groupstudy.com; ccielab@groupstudy.com;
> cisco@groupstudy.com
> Subject: Re: SVI can't become an OSPF neighbor?
>
>
>
> Hi
>
> The only issue I had with a swith is with mtu.
>
> Try configuring "ip ospf mtu-ignore" and see if it works.
> Kal
>
>
> 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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