John Hay wrote:
The linux guys seems to have multiple fibs (or whatever they call them)
which they can chain together by giving them different priorities. The
effect seems to be that a packet will be matched through the highest
priority fib to the lowest until a route match is found en then is used.
Will something like that be possible? I came across that kind of use
with the olsr guys. They let olsrd twiddle one of the higher priority
fibs and then put fallback routes in a lower priority fib. That way
olsrd can override a route (even the default route) and when olsrd
exists and deltes all its routes, the original ones are still in the
lower priority fib and will be used.
XORP already does this without relying on any kernel support.
Each routing protocol supplies an origin table of its own. The RIB makes
the decision on which route to plumb to the kernel based on
administrative distance. When xorp_olsr exits, its origin table is
removed, and the winning routes are recalculated.
You don't need to go to the kernel for this sort of thing unless you
specifically need to implement route policy based on which interface(s)
a packet came in on.
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