True, and it'll be resent forever, taking 9000 bytes of bandwidth every time.
:( And I'll still use it in my SPF, and so the black hole will still occure.

Daniel

On Thu, 20 Jun 2002 11:35:20 -0700
prashant desai <prashant_s_desaiHOTMAIL.COM> wrote:

> that makes sense :-)
> but the drop lsa will not be acked....never reachd ospf
>
> thanks
> Prashant
>
>
> >From: Daniel Gryniewicz <dangNEXTHOP.COM>
> >Reply-To: Mailing List <OSPFDISCUSS.MICROSOFT.COM>
> >To: OSPFDISCUSS.MICROSOFT.COM
> >Subject: Re: mtu in DD exchange.
> >Date: Thu, 20 Jun 2002 14:30:58 -0400
> >
> >So, I send you the 9000 byte packet. My IP layer thinks it's fine. Your
> >IP
> >layer drops it. An adjacency never forms. Or, worse yet, the adjacency
> >formed (the HELLOs and DDs were all small enough) and then I get and flood
> >a
> >huge LSA from someone else. You drop it, but I assume you have it. My SPF
> >puts a route from this LSA through you, but you don't have it, so
> >blackhole.
> >I *have* to know that every packet I send to you can make it. The MTU
> >agreement assures that packets won't get dropped because of MTU mismatch.
> >
> >Daniel
> >
> >On Thu, 20 Jun 2002 11:27:52 -0700
> >prashant desai <prashant_s_desaiHOTMAIL.COM> wrote:
> >
> > > exactly..the ip layer should drop the packet..why should OSPF care about
> > > it..dont you think its the ip layers job to check mtu conformance of
> > > incomming packets ?
> > >
> > >
> > > >From: Daniel Gryniewicz <dangNEXTHOP.COM>
> > > >Reply-To: Mailing List <OSPFDISCUSS.MICROSOFT.COM>
> > > >To: OSPFDISCUSS.MICROSOFT.COM
> > > >Subject: Re: mtu in DD exchange.
> > > >Date: Thu, 20 Jun 2002 13:59:07 -0400
> > > >
> > > >What fragments? All OSPF (baring virtual links) traffic is only on one
> > > >link.
> > > >What the MTU agreement assures is that everyone on the link agrees what
> >the
> > > >MTU *for that link* should be. If I think the MTU is 9000, and you
> >think
> > > >the
> > > >MTU is 1500, you'll silently drop all my packets. My IP layer won't
> > > >fragment,
> > > >because it thinks the MTU is large enough.
> > > >
> > > >Daniel
> > > >
> > > >On Thu, 20 Jun 2002 10:45:44 -0700
> > > >prashant desai <prashant_s_desaiHOTMAIL.COM> wrote:
> > > >
> > > > > Hi,
> > > > > Can anyone give me a good reason why OSPF routers have to agree on
> > > > > the MTU size during DD exchange process..
> > > > > As OSPF runs over IP..fragmentation or reassembly should not be its
> > > > > concern..and they will be transparently handled by the IP layer..
> > > > >
> > > > > Prashant
> > > > >
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