Implementing and Operating Cisco Service Provider Network Core Technologies (SPCOR) — Question 268

While an engineer deploys a new Cisco device to redistribute routes from OSPF to BGP, they notice that not all OSPF routes are getting advertised into BGP.
Which action must the engineer perform so that the device allows O, OIA, OE1, and OE2 OSPF routes into other protocols?

Answer options

• A. Configure the device to pass only O and E2 routes through it.
• B. Configure the synchronization keyword in the global BGP configuration.
• C. Configure the keyword nssa in the redistribution entry.
• D. Configure the keywords internal and external in the redistribution entry.

Correct answer: D

Explanation

The correct answer is D because both internal and external keywords are necessary to ensure that all types of OSPF routes, including O, OIA, OE1, and OE2, are redistributed into BGP. Option A is incorrect as it limits the routes to O and E2 only. Option B is not relevant because synchronization is not needed for OSPF to BGP redistribution. Option C is also incorrect since the nssa keyword pertains to not-so-stubby areas, which does not directly affect route redistribution to BGP.