Consider there are two ABRs connecting a NSSA area to the backbone, do both ABRs convert the Type7 LSA into Type5 LSA for backbone.Also, clear what is the case of stub area , do both ABRs arvertise routes into backbone area ?
Only the the ABR with the highest RID will assume the type 7 to type 5 translation as specified in RFC 1587 paragraph 4.1:
"4.1 Translating Type-7 LSAs Into Type-5 LSAs
This step is performed as part of the NSSA's Dijkstra calculation after type-5 and type-7 routes have been calculated. If the calculating router is not an area border router this translation algorithm should be skipped. All reachable area border routers in the NSSA should now be examined noting the one with the highest router ID. If this router has the highest router ID, it will be the one translating type-7 LSAs into type-5 LSAs for the NSSA, otherwise the translation algorithm should not be performed."
In a non-NSA stub area, all ABRs advertise routes from the specific area to the backbone.
Hope this helps,
Harold Ritter Sr. Technical Leader CCIE 4168 (R&S, SP) email@example.com México móvil: +52 1 55 8312 4915 Cisco México Paseo de la Reforma 222 Piso 19 Cuauhtémoc, Juárez Ciudad de México, 06600 México
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