Am Fri October 16 2009 12:34:06 schrieb Dearlove, Christopher (UK): > > Link sensing and hysteresis, even with a local metric, is no > > replacement for a > > > good additive routing metric used for the dijkstra algorithm in global > > > > routing. > > Agreed. It is worth noting however that at least in some systems > (802.11) link sensing (hysteresis - when the word is properly used > - is just a detail there) makes the difference between a system > that doesn't work (due to the differences in 802.11 broadcast and > multicast) and one that works. Link metrics make the difference > between a system that works (for at least some uses) and one that > may work better. It might even make sense to use the calculated routing metric value for link sensing too (deciding if you include the link into your routing set). (activating a new link if it's get better than ETX 8 and drop it completely if it goes beyond ETX 16 for example) > > If we put only hop count metric into the main document that's what > > most research projects will be using as a comparision. > > Will you please read the metrics draft, and my postings here, which have > said, again and again, that this is NOT the proposal. The default value in your metric draft will still create a hopcount metric. And there is no other example for a working link metric inside the current metric draft. So if we include the metric draft into the OLSRv2 draft, the default implementation will still be hopcount and there will be no other metric inside the OLSRv2 draft. We all know that the purpose of the draft is to say the people "use a good link metric"... but I fear there will be still a lot of researchers around that will use "default rfc olsrv2". Henning Rogge -- Diplom-Informatiker Henning Rogge , Fraunhofer-Institut für Kommunikation, Informationsverarbeitung und Ergonomie FKIE Kommunikationssysteme (KOM) Neuenahrer Straße 20, 53343 Wachtberg, Germany Telefon +49 228 9435-263, Fax +49 228 9435 685 mailto:henning.rogge at fkie.fraunhofer.de http://www.fkie.fraunhofer.de GPG: E1C6 0914 490B 3909 D944 F80D 4487 C67C 55EC CFE0
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