[Olsr-users] route instability
Thu Sep 13 06:33:30 CEST 2007
Gian Maria Giani wrote:
> We have some problems with a network running OLSR v.0.4.10, in that the
> routes are not very stable.
> The problem seems strange. The main points are:
> - the network contains 10 nodes. They are in fixed positions.
> Each node has about 3 neighbours, and the maximum distance between nodes is 3
> - the routes are not stable. If one observes the routing table
> of one node in a given moment in time, and then observes it again after
> some seconds, many times the observed routes are different
> - this seems related to the fact that some neighbors are listed
> as non-symmetric (they appear as symmetric for some moments, then appear as
> asymmetric, then again as symmetric)
> - the percentage of lost packets over these asymmetric links,
> however, is 0% in both directions
> We have already tried in many ways to solve the problem... in particular
> we have increased the validity time of hello messages up to 60 seconds,
> but the problem is still there. Any idea?
I recently did a demo for my local linux user group, and we noticed this
So we had a look at the link quality (LC) settings. After enabling LC
the route map stability was significantly improved.
You can visualise the route map with dot-draw and the perl script from
Info from the LinuxSA is demo here;
Compare the second and third diagrams;
the second did not use LC
the third used LC=2
Operating Systems, Services and Operations
Information Technology Services, The University of Adelaide
"I am not a finite state machine"
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