Hi Juliusz On Tue, Aug 25, 2015 at 1:37 PM, Juliusz Chroboczek < j...@pps.univ-paris-diderot.fr> wrote:
> > Ted, I asked a question about a feature that is considered critical in > > every routing environment that I am familiar with. > > I think that we all have different pictures of what a homenet will look > like. Some of us appear to believe that homenets will predominantly > consist of wired links with a few WiFi access points at the edges, while > others (including myself) think that as soon as we give the hungry masses > the ability to build self-configuring networks that are efficiently routed > at layer 3, people will start building networks where wireless is used for > transit. > > This is exciting stuff, Alia, more exciting than some of the contributors > to this list seem to realise. > Absolutely on the exciting stuff and on the ability to make a real impact. On the different pictures, I agree totally & that's why I'm poking a little into assumptions & requirements. > Now the only goal of ECMP is to improve performance. If the homenet uses > only wired links for transit, then ECMP is easy to do, whether in IS-IS or > in Babel. If, however, the homenet is using multiple mutually interfering > radio links for transit, then a naive implementation of ECMP will actually > decrease performance due to interference (cross-link collisions). Doing > ECMP in the particular case of non-interfering paths (e.g. wired paths) > should be safe, and the radio interference extension to Babel should > already carry all the required information. > > Thankfully, ECMP does not have to be a Homenet requirement -- if the ECMP > extension is backwards compatible (and there's no reason why that > shouldn't be the case), then we can simply leave it as an implementation > option, and let the market decide. > > I realise you're impatient to see ECMP in Homenet, Alia, but my main > priorities right now are to satisfy the requirements of the IETF > secretariate wrt. the Babel extension drafts (I've missed the IANA > requirements in one of the drafts), getting shncpd into shape for > integration into Debian, and helping with the Babel/Bird implementation -- > and teaching starts in two weeks! Please give me a few months until > things calm down a little. Actually, I don't have a strong opinion on whether ECMP is needed in homenet! That's why I'm asking - but I'm hoping for technical reasons and trying to understand why the interference isn't a general problem. Perhaps it's just because for ECMP/multi-path, there is a choice and trade-off to be examined as to the improvement. I'm sure you are busy! Regards, Alia > -- Juliusz >
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