300-415 Question #213: Real Exam Question with Answer & Explanation

The correct answer is B: route with the higher OMP route preference value. When multiple OMP routes for the same prefix are learned from the same Cisco SD-WAN device, the route with the highest OMP route preference value is selected.

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Question

Which OMP route is selected if it was learned from the same Cisco SD-WAN device at location S4406T9E02F15?

Options

Aroute with the lower origin metric
Broute with the higher OMP route preference value
Croute with the higher router ID
Droute with the lower administrative distance

Explanation

When multiple OMP routes for the same prefix are learned from the same Cisco SD-WAN device, the route with the highest OMP route preference value is selected.

Common mistakes.

A. The origin metric is used earlier in the OMP best path algorithm to differentiate between routes learned from different sources, but not for routes from the same device.
C. The router ID is used as a tie-breaker later in the OMP best path algorithm, typically when comparing routes from different TLOCs or different WAN Edge routers, not specifically for multiple routes from the same device with the same preference.
D. Administrative distance is primarily used in traditional routing for comparing routes from different routing protocols, not as a direct OMP best path attribute for routes learned from the same SD-WAN device.

Concept tested. OMP best path selection algorithm

Reference. https://www.cisco.com/c/en/us/td/docs/routers/sdwan/configuration/sdwan-xe-gs-book/sdwan-overlay-network.html

Topics

#OMP#Route Selection#Route Preference#Cisco SD-WAN

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