[Olsr-dev] Freifunk Testing

[Henning Rogge]

Am Dienstag 17 Juni 2008 09:56:35 schrieb Bernd Petrovitsch:
> On Die, 2008-06-17 at 09:35 +0200, Henning Rogge wrote:
> > Am Montag 16 Juni 2008 23:29:46 schrieb Daniel Nitzpon:
>
> [...]
>
> > > i don't grasp the scenarios for fisheye routing loop production:
> > >
> > > Henning Rogge schrieb:
> > >  > The problem can happen at the edge of a fisheye zone. You get an
> > >  > "update border" at this point because some packages are not flooded
> > >  > to the edge of the network.
> > >
> > > why is that? can you give an example topology?
> >
> > let's just look at a very extreme example.
> >
> > we have a linear string of nodes (a total of 6 nodes) and a long
> > connection from node 1 to 6 through other parts of the network.
> >
> > 1 -- 2 -- 3 -- 4 -- 5 -- 6
> >
> > +.....(many nodes).......+
> >
> > Node 1 and 2 loose connection, so node 2 sends a new TC with the changed
>
>  ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
>
> > topology information. Unfortunately fisheye sends this TC with a TTL of
> > 3, so only nodes 2, 3 and 4 get it.
> >
> > Node 1 sends a package to 6, because it does not know about the lost
>
>                                                                   ^^^^
>
> > connection between 5 and 6, it sends the package to node 2. Node two
> > knows
>
>  ^^^^^^^^^^^^^^^^^^^^^^^^^^^
>
> Is that difference intentional?
No, it's just a mistake ^^

But I hope you got the idea...

Henning

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