300-415 Question #393: Real Exam Question with Answer & Explanation

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• Avpn 2 router ospt timers spf 200 1000 10000 redistribute natpool-outside redistribute omp area 0 interface ge0/0.200 exit exit ! omp advertise ospf
• Bvpn 2 router ospt timers spf 200 1000 10000 redistribute omp advertise ospf external advertise connected
• Cvpn 2 router ospf timers spf 200 1000 10000 redistribute natpool-outside redistribute connected area 0 interface ge0/0.200 exit exit ! omp advertise connected advertise ospf
• Dvpn 2 router ospf timers spf 200 1000 10000 redistribute omp area 0 interface ge0/0.200 exit exit ! omp advertise ospf external

Explanation

To ensure OSPF routes are reachable between different sites in a Cisco SD-WAN fabric, OSPF must redistribute routes into OMP, and OMP must advertise those OSPF routes.

Common mistakes.

• A. redistribute natpool-outside is unrelated to OSPF route exchange, and advertise ospf under OMP might not cover all necessary OSPF route types, such as external routes.
• C. redistribute natpool-outside and redistribute connected are insufficient; OSPF routes must be explicitly redistributed into OMP, and the OMP advertisement commands may not fully cover all required OSPF route types.
• D. While redistribute omp is correct for OSPF, advertise ospf external under OMP without also advertising general OSPF routes (or advertise ospf) might omit internal OSPF routes, and advertise connected is generally needed for complete reachability.

Concept tested. Cisco SD-WAN OSPF-OMP Route Redistribution

Reference. https://www.cisco.com/c/en/us/td/docs/routers/sdwan/configuration/routing/ios-xe-17/routing-book-xe/sdwan-ospf.html

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