Exam 300-415 topic 1 question 234 discussion

Cant be C, as it's the same router. Cant be D as it's only OMP. That leaves A or B, and B makes more sense.

Vague question. Such questions cannot be on paid exams.

See Shahansa's comment for the link, answer is verified.

It is D https://www.cisco.com/c/en/us/td/docs/routers/sdwan/configuration/bridging-routing-segmentation-qos/vedge/bridging-routing-segmentation-qos-book/unicast-overlay-routing.html#:~:text=If%20the%20OMP%20route%20is,higher%20OMP%20route%20preference%20value.

The AD and the preference should be the same, it says nothing that changes were made to those values. So there are the values that are different such as the metric and the system IP, it does not say anything about the metric either so they should be the same therefore yes or yes the system IP should be different and the one with a higher value has greater preference

https://www.networkacademy.io/ccie-enterprise/sdwan/omp-best-path-selection

D is correct

From Official Book (authors Jason, Dana, Dustin and John): Chapter 3 - Control Plane and Data Plane Operations Path Selection: The best-path selection occurs in the following order: 1. Valid OMP route 2. Locally sourced OMP route 3. Lower administrative distance 4. Higher OMP Preference 5. Higher TLOC Preference 6. Prefer Origin 7.

B is the correct answer according to me

1) Prefer ACTIVE routes over STALE routes. 2) Select routes that are Valid. 3) Prefer routes with lower administrative distance (AD) (on vEdge only). AD is a locally-significant value on each router and depends on the OS. 4) Prefer routes with a higher route preference value. By default, all omp routes have 0 preference. 5) Prefer routes with a higher TLOC preference value (on vEdge only). TLOC preference is a parameter in TLOC routes. 6) Compare the origin type 7) Compare the origin metric - prefer lower metric so I would go with D

D is the correct answer

Administrative distance is the metric used to select the best path when there are two or more different routes to the same destination from multiple routing protocols. But this question does not mention about multiple routing protocols from remote site.

Please disregards my previous post. I found this: https://www.cisco.com/c/en/us/td/docs/routers/sdwan/configuration/routing/ios-xe-17/routing-book-xe/m-unicast-routing.html "If the OMP route is valid and if it has been learned from the same Cisco SD-WAN device, select the OMP route with the lower administrative distance." So it should be D.

AD does not take part of OMP as it is no listed here: https://www.cisco.com/c/en/us/support/docs/routers/sd-wan/217479-omp-best-path-selection-peculiarities-an.html So it should be B "route with the higher OMP route preference value"

https://www.cisco.com/c/en/us/support/docs/routers/sd-wan/217479-omp-best-path-selection-peculiarities-an.html 1. Route Resolvability Next-hop TLOC is Reachable (data plane BFD session is here) 2. Prefer highest route preference 3. Prefer highest TLOC preference 4. Prefer best origin code (Connected, Static, eBGP, EIGRP Internal, OSPF Intra, OSPF Inter, OSPF External, EIGRP External iBGP, Unknown/Unset 6. Route Source Preference On vSmart: prefer Edge router-sourced route over vSmart-sourced route 5. Prefer OMP Route with lowest origin metric 7. Prefer route received from lowest System-IP 8. Prefer route from highest Private TLOC IP-address originated from the same site-id 9. outbound control policy 10. send-path-limit

Please confirm if B or D. How can AD be different if it came from the same device?