[OLSR-users] question route flapping

[Andreas Tønnesen]

Hi aaron,

Yes, this is the downside of hop-count-only based routing :(
If you are running a rather static topology you could try experimenting
with hysteresis values. However, I do belive that the problem often is
that a weak link becomes a "hub" for very much traffic, and therefore it
will go down and come up again as soon as traffic is not routed to it -
and this will becom a little vicous cycle of its own.
All I can say is that I know people are working on this - and I do believe
it is something that will greatly improve mesh routing once in place :)

I have suggested trying to raise the receive threshold on wlan interfaces
earlier. This _could_ be of some help, if it works in ad-hoc mode, since
this would prevent olsrd from receiving HELLO messages from very weak
neighbors... Has anybody tried this?

- andreas

> hi!
>
> in vienna we set up many ndoes to have one or more directional links
> (yagis, planar antennas, ...) and one omni.
> each is conencted to its own wrt54g.
>
> we can observe the following behaviour:
> sometimes omni 1 and omni 2 from node 1 and 2 will see each other.
> sometimes they lose conenction. the directional links are supposed to
> cover the big distances not the omnis.
>
> when suddenly the omnis start to see each other for a brief period of
> time, traffic will flow over these (less hops!) and stop using the
> directional links. anything (except including link quality) that can be
> used to prevent these omnis to send the traffic?
>
> cheers,
> aaron.
>
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---------
Andreas Tønnesen
http://www.olsr.org