4.4.4. Future LSA Validation

It is expected that new LSAs will be defined that will not be processed during the Shortest Path First (SPF) calculation as described in Section 4.8, for example, OSPFv3 LSAs corresponding to information advertised in OSPFv2 using opaque LSAs [OPAQUE]. In general, the new information advertised in future LSAs should not be used unless the OSPFv3 router originating the LSA is reachable. However, depending on the application and the data advertised, this reachability validation MAY be done less frequently than every SPF calculation.

To facilitate inter-area reachability validation, any OSPFv3 router originating AS scoped LSAs is considered an AS Boundary Router (ASBR).

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