[Babel-users] Diversity Routing for the Babel Routing Protocol

[Juliusz Chroboczek]

>>> Regarding Z3 and RTT, you're right, it's not exactly clear.  The current
>>> implementation of Z3 applies the diversity factor *after* all other costs
>>> are computed, included the one induced by babel-rtt.

>> Huh?  RTT and Z3 work at completely different places -- RTT tweaks the
>> cost computation, while Z3 changes the announced metric.

> And we've just demonstrated that it is confusing, even to the authors
> of the IDs.

Don't blame Baptiste, it is a difficult topic.  There's good reason why
we're the one of the only production-quality protocols in the world that
support hybrid metrics.  (There's IGRP, not sure about IS-IS.)  It might
be interesting to write up everything we've learnt on the subject, but
that's more work than just an off-the-cuff comment on a mailing list.

> Secondly, I was also hoping for an extended example of why diversity helps
> on longer paths as per my first email.

I've added a second example.  Is there anything else you had in mind?

-- Juliusz