[Olsr-users] [Olsr-dev] Configuring TC redundancy parameter?
Tue May 7 07:22:45 CEST 2013
On 05/06/2013 09:19 PM, chris - wrote:
> Thanks very much for your reply. My thought is that using solely the MPR
> set may increase reliability in our particular routing scenario, however
> it would be too much work to test. It may make a good project, though.
There are two reasons why MPRs make networks unreliable with the current
The first one is that the ETX metric tends to go up and down on all
links except the ones with no packet loss at all (see
http://en.wikipedia.org/wiki/Bernoulli_trial). This means even a totally
stable network will give you some fluctiations because you can only
measure packet loss, not the loss-probability itself.
The second one is that the current MPR algorithm is a pure greedy
algorithm, which doesn't care about the former MPR set. This means there
are situations where it will constantly switch MPR settings because of
metric fluctuations. Which will result in a more instable flooding of
Diplom-Informatiker Henning Rogge , Fraunhofer-Institut für
Kommunikation, Informationsverarbeitung und Ergonomie FKIE
Fraunhofer Straße 20, 53343 Wachtberg, Germany
Telefon +49 228 9435-961, Fax +49 228 9435 685
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