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Inter-Area Solution As presented at last IETF: Parallels and reuses the mechanism for validation of OSPF type 5 LSAs Validation of type-5 LSAs AS external route (type-5) LSAs have also the AS-scope, hence there is a similar problem with their validation The problem is addressed via use of area-scope ASBR-summary (type-4) LSAs originated by ABRs for every known ASBR The validation of AS-scope (type-11) opaque LSAs could be achieved if ABRs treat their originators as ASBRs |