Question

A service provider runs OSPFv2 with a not-so-stubby area (NSSA) that connects to a customer network redistributing static routes. The customer's routes appear as Type-7 LSAs inside the NSSA. Operations reports that these customer routes are NOT reaching routers in the backbone (area 0) or other regular areas. There are two ABRs attached to the NSSA. Which statement correctly explains the expected behavior and the most likely cause?

Accepted Answer

Only the ABR with the highest router ID in the NSSA translates Type-7 LSAs into Type-5 LSAs by default, and translation or the P-bit is likely misconfigured or clear.

Answer

Type-7 LSAs are flooded domain-wide unchanged; the backbone routers are simply filtering them with a route map that must be removed.

Answer

Type-7 LSAs must be manually converted to Type-3 summary LSAs on each ABR before they can enter area 0.

Answer

NSSAs cannot originate external routes at all, so the customer statics should have been injected as Type-1 LSAs on the ABR instead.