ospf database size - affects that underlying transport mtu might have

Wed Nov 22 18:26:13 UTC 2017

On 11/22/17 9:51 AM, Aaron Gould wrote:
> This is a *single area* ospf environment, that has been stable for years..
> But now suddenly is having issues with new ospf neightbor adjacencies ,
> which are riding a 3rd party transport network
>
> Anyone ever experienced anything strange with underlying transport network
> mtu possibly causing ospf neighbor adjacency to be broken ? > I'm asking if
> the underlying 3rd party transport layer 2 network has a smaller mtu than
> the endpoint ospf ip interface have, could this cause those ospf neighbors
> to not fully establish ? 

Yes. Easy to check with a ping sweeping a range of sizes and DF set.

> and I'm also asking this if the single ospf area
> has grown large enough to cause some sort of initial database packet to be
> larger than that underlying 3rd party mtu is providing

Not likely. How many routers and are things relatively stable in terms 
of routes changing?

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Jay Hennigan - CCIE #7880 - Network Engineering - jay at impulse.net
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