OSPF RFC1587 vs RFC3101 NSSA compatibility.

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  1. Path selection
    1587:
    a. Any type 5 LSA.
    b. A type-7 LSA with the P-bit set and the forwarding
    address non-zero.
    c. Any other type-7 LSA
    RFC3101:
    1. A Type-7 LSA with the P-bit set.
    2. A Type-5 LSA.
    3. The LSA with the higher router ID.
  2. The P-bit default is now defined as cleared.

  3. A new area configuration parameter, NSSATranslatorRole, is defined in Appendix D. It specifies whether or not an NSSA router will unconditionally translate Type-7 LSAs to Type-5 LSAs when acting as an NSSA border router.

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