On Donnerstag 23 April 2009 15:55:08 Juliusz Chroboczek wrote: > >> and if you want to understand why it's possible in Babel but not in OLSR > >> to do approximations of their metric, check the Babel draft, section > >> 2.5.2. > > > > I'm pretty sure it's possible with a proactive protocol like OLSR (of > > course it would require an extension in the TCs to transport the > > channels of the links). > > Babel is proactive too. The difference is that OLSR is link-state, > while Babel is distance-vector. > > The issue is that a metric that takes deversity into account looses > a property known as isotonicity. In a link-state protocol, you cannot > use a non-isotonic metric without persistent routing loops. Babel can > use a non-isotonic metric just fine, although in that case it is no > longer deterministic. The MIC paper I have contains a sollution for the "non-isotonic" parts of MIC.
> (In practice, this means that channel assignment will depend on the > order in which your routers boot.) > > There are solutions to the isotonicity problem, but they require using > multiple routing tables. If you implement that in OLSR, I'm looking > forward to stealing your code ;-) You just have to set the "source interface" for the different routes. Should not be difficult. Henning
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