How to ignore OSPF MTU checking?

[Kenth Eriksson]

On Sun, 2019-03-24 at 04:13 +0100, Ondrej Zajicek wrote:
> CAUTION: This email originated from outside of the organization. Do
> not click links or open attachments unless you recognize the sender
> and know the content is safe.
> 
> 
> On Fri, Mar 22, 2019 at 09:24:58PM +0100, Piotr Marciniak wrote:
> > Cisco switches require this for proper OSPF operation, if MTU is
> > set
> > different on equipment. But afaik it does not hit Bird. We have
> > such
> > sessions between Cisco and Bird. And works fine without this
> > setting on
> > Bird. But maybe therr is scenario we have never met but Kenth
> > did?Best
> > wishes,Peter
> 
> We have a bug in older versions of BIRD that it does not verify that
> MTU
> of both sides is the same. We fixed that in the latest versions.
> 

How does bird handle transmission of OSPF packets packets larger than
the link MTU? Does it rely on IP fragmentation? Or can it split into
multiple protocol packets?

What is the expected bird behaviour if the link mtu is different of the
two sides?

> --
> Elen sila lumenn' omentielvo
> 
> Ondrej 'Santiago' Zajicek (email: santiago at crfreenet.org)
> OpenPGP encrypted e-mails preferred (KeyID 0x11DEADC3,
> wwwkeys.pgp.net)
> "To err is human -- to blame it on a computer is even more so."