[Xorp-hackers] XORP enhancement for wireless mesh network routing

[Igor Maravić]

> Igor:  Why should we ever restrict adding the connected routes?
>
> It seems to me that if the routing protocol wants it added, fea
> should just do so.  But maybe I'm missing something?
>

When the route comes to the RIB, if it isn't recognized as direct
route, RIB assumes that this route is external one.
This happens with BGP routes, because their nexthop is external.

Because of that it will try to resolve the nexthop for that route with
existing IGP routes.

The BGP routes can't be resolved, if this behavior is overridden.

Thus I think that the best solution would be if the OLSR would tell
the RIB to add directly connected route.
This will resolve the problem of RIB recognizing OLSR routes as external.
My proposition is to add function add_direct_route, that would be
called via xrl from OLSR, the same way as add_route is called now. But
that function would be in any doubt if it should resolve route as
external or not.

Maybe it is possible to check if route is resolved for wireless link,
or not, from the add_route function, without braking the BGP route
resolution,
but I think that would stress out a performance dramatically. This is
due the fact that before resolving any BGP route it would pass through
all vifs to check if they are wireless or not (according to Jiangxin
patch)

BR
Igor