[Olsr-dev] Multipath routing in OLSRD

Henning Rogge (spam-protected)
Tue Apr 28 09:58:53 CEST 2009

Am Tuesday 28 April 2009 00:33:36 schrieb Adam Nowak:
> Hello,
> I'm new to this list, and to all the olsr stuff too. Sorry, if I'm asking
> about well known issues. I'm interested in implementing multipath
> extension to OLSRd. At first, I'd like to add some alternative routes to
> the same destination (route entries which has the same destination but
> other next-hops). As I've noticed in the code, there is the entry
> "rt_best" which is responsible for selecting best route. I don't
> understand, how OLSRd interacts with system routing table in
> olsr_update_rib_routes() function, can you help me work it out or give
> some advices?
> Any help would be appreciated!
The main problem you have to solve is how to force your packages to stay on 
the "secondary" route. You cannot do this "hop by hop" because the next hop 
will just send your packages to the shortest route again.

For efficient multipath you need some "distance" (2 hops or more) between the 
two routes to prevent collisions between the two paths.


Diplom Informatiker Henning Rogge
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