Which OMP route is selected if it was learned from the same Cisco SD-WAN device at location S4406T9E02F15?
Which OMP route is selected if it was learned from the same Cisco SD-WAN device at location S4406T9E02F15?
When determining which OMP (Overlay Management Protocol) route to select when learned from the same Cisco SD-WAN device, the route with the higher OMP route preference value is chosen. This is because the preference value specifically indicates the priority of the route in OMP, and a higher value means a higher preference, making it the selected route in such scenarios.
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 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.
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
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.
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.
D is correct
Please confirm if B or D. How can AD be different if it came from the same device?
https://www.networkacademy.io/ccie-enterprise/sdwan/omp-best-path-selection Prefer routes with lower administrative distance (AD) (on vEdge only). AD is a locally-significant value on each router and depends on the OS. Different platforms may have different AD values for different protocols. For example, OMP has AD of 250 on vEdges and 251 on cEdges. Additionally, network admins can define floating static routes with various ADs for the same prefix. AD is only compared when the same WAN edge router receives the same site-local prefix from multiple routing protocols. AD is not a parameter in OMP, is not advertised, and does not influence vSmart.
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"
D is the correct answer
B is the correct answer according to me
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.
sorry for typo 7. Lowest Origin metric 8. Highest System IP 9. Highest TLOC private address So, I'll go with D.
https://www.networkacademy.io/ccie-enterprise/sdwan/omp-best-path-selection
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
it is a choice between the same source protocol (OMP), therefore they have the same AD, I discard answer D for me.
See Shahansa's comment for the link, answer is verified.
Vague question. Such questions cannot be on paid exams.
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.