Hello!
- Routing table will have lots of address prefixes that are not available
to the local interface addresses.
Well, all the direct routes are prefixes by definition.
- To be a prefix list entry, it should come via an RA.
Wrong. But this does not matter, RA routes may be tagged with a flag.
- Also, the search over a longer routing table across all nodes is more
time consuming.
Do you jest? You compare linear search with lookup in radix tree. :-)
Alexey