Re: ip ospf mtu-ignore

Naufal,

OSPF neighbors need to have matching MTUs for an adjacency to form. If the
MTUs do not match, then you can set the MTU to match or use the ip ospf
mtu-ignore command. You only need it on links where the MTU size does not
match, it does not need to be set on every switch/router. There is no need
for a reload. EIGRP has no such requirement.

If you do have neighbors flapping, the problem is likely something else. Let
us know more about the flapping issue and maybe we diagnose that.

On Wed, Sep 16, 2009 at 7:59 AM, Naufal Jamal <naufalccie_at_yahoo.in> wrote:

> Hi,
>
> I am using a network of routers and switches.running ospf on them.to build
> the
> neighborship between a router and a switch I had to give ip ospf mtu-ignore
> command on the router interface.the neighborship comes up but flaps every
> now
> and then.
>
> 1) What all things you need to keep in mind while giving this command?
> 2)should i be giving this command on all the switches and routers runnig
> ospf
> 3)should i reload the router after this command?
> 4)if I am using EIGRP instead,is there any particular command for
> changing/ignoring the MTU to bring the neighborship up?
>
> Pls explain the exact usage of this command....
>
> Thank you,
> Naufal
>
>
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Bryan Bartik
CCIE #23707 (R&S), CCNP
Sr. Support Engineer - IPexpert, Inc.
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