300-415 Question 151
Single answerYou are configuring OSPF in a Cisco SD-WAN environment where multiple OMP routes are being redistributed into OSPF. During testing, you notice that the OSPF routes are not being advertised to connected OSPF neighbors. What could be the most likely cause of this issue?
- A
The OSPF area type is configured as a stub area, which blocks external routes.
- B
The OMP routes are missing the correct metric during redistribution into OSPF.
- C
The OSPF redistribution is not enabled under the correct VRF.
- D
The OSPF process ID does not match the OMP process ID.
Show answer and explanation
Correct answer: C
Explanation
In Cisco SD-WAN, route redistribution between OMP and OSPF requires careful configuration under the correct VRF. If the redistribution is not enabled under the appropriate VRF, OSPF will fail to advertise the redistributed routes to its neighbors. This is a common configuration oversight when setting up OSPF in an SD-WAN environment.
- A. Incorrect.
Stub areas in OSPF prevent Type 5 external routes from being propagated, but this scenario involves redistribution into OSPF, not external route propagation.
- B. Incorrect.
While metrics are important for route selection, missing metrics during redistribution typically result in suboptimal routing, not route advertisement failure.
- C. Correct.
In Cisco SD-WAN, OSPF redistribution needs to be correctly configured under the appropriate VRF. If the redistribution is not enabled under the correct VRF, OSPF won't advertise those routes to its neighbors.
- D. Incorrect.
OSPF and OMP do not have process IDs that need to match; OSPF process IDs are local to the router and do not affect route redistribution.