[Olsr-users] olsrd overhead

[Henning Rogge]

On Mittwoch 08 April 2009 20:24:57 Juliusz Chroboczek wrote:
> Ah, smart.
Thanks.

> So in short you flood a summary of the link-state database very
> frequently, and have some new kind of message to explicitly request
> reflooding of part of the database, right?
Yes.

> Now, I'd expect one summary entry to take 6 bytes, which means that for
> a 100 node network, you'd be spending 600 bytes/s of traffic for
> distributing summaries.  Which is definitely reasonable.
8 bytes, because we include a message type (to be able to use the same stuff 
for other message types later).

> I'm wondering if you couldn't completely do away with periodic flooding of
> TCs -- TC flooding would only happen upon a topology change, or be
> triggered by explicit requests, when a node detects that there is some data
> that it doesn't have.  Assuming aggressive duplicate suppression, this
> could be fairly efficient.
We plan to keep the compatiblity with the OLSR protocol, but maybe use huge 
validity times (30 minutes ?) and reduce the number of periodic TCs to 
something like 1 every 15 minutes (if nothing happens). Will need additional 
work to run smooth, but I think that might be the next step to bigger 
networks.

> Looks like a sexy protocol.
Yes, I think so. As long as the metric values of the protocol are stable 
enough.

Henning

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