RIP and directly connected routes

[olivier a]

I'm studying RIP and have a really hard time understanding the rationals
behind to automatically pulling directly connected routes.
If I connect 4 RIP routers in a circle and neither is advertising it's
connected routes, it's going to be very quiet ...
Please help me understand :-)

Secondly, I use 'protocol direct' to have these connected routes pulled
from kernel tables to RIP and advertised. Is that the right way to do it ?

Lastly, these 'protocol direct' routes override the split horizon rule. Is
there a way to prevent an interface to multicast its own subnet ?

Thanks, I 'm just discovering BIRD, I may be asking clumsy questions ;-)
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