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300-415 · Question #123

300-415 Question #123: Real Exam Question with Answer & Explanation

The correct answer is A: vpn 10 name "***** Service VPN 10 ****") router ospf redistribute omp route-policy OSPF_Route_Policy area 0 interface ge0/2 exit lists prefix-list W2_Loopback ip-prefix 10.10.10.5/32 ! route-policy OSPF_Route_Policy sequence 1 match address W2_Loopback ! action accept set metric 100 metric-type type1. To provide OSPF neighbors access to a specific OMP-learned loopback route in a service-side VPN, the OMP route must be redistributed into OSPF using a route policy that filters for the exact prefix.

WAN Edge Router Deployment

Question

A customer is receiving routes via OMP from vSmart controller for a specific VPN. The customer must provide access to the W2 loopback received via OMP to the OSPF neighbor on the service-side VPN. Which configuration fulfills these requirements?

Options

  • Avpn 10 name "***** Service VPN 10 ****") router ospf redistribute omp route-policy OSPF_Route_Policy area 0 interface ge0/2 exit lists prefix-list W2_Loopback ip-prefix 10.10.10.5/32 ! route-policy OSPF_Route_Policy sequence 1 match address W2_Loopback ! action accept set metric 100 metric-type type1
  • Bvpn 0 router ospf redistribute omp route-policy OSPF_Route_Policy area 0 interface ge0/2 exit lists prefix-list W2_Loopback ip-prefix 10.10.10.5/24 ! route-policy OSPF_Route_Policy sequence 1 match address W2_Loopback ! default action accept set metric 100 metric-type type1
  • Cvpn 0 router ospf redistribute omp route-policy OSPF_Route_Policy area 0 interface ge0/2 exit lists prefix-list W2_Loopback ip-prefix 10.10.10.5/32 ! route-policy OSPF_Route_Policy sequence 1 match address W2_Loopback ! action accept set metric 100 metric-type type2
  • Dvpn 10 name "***** Service VPN 10 ****") router ospf redistribute omp route-policy OSPF_Route_Policy area 0 interface ge0/2 exit lists prefix-list W2_Loopback ip-prefix 10.10.10.5/24 ! route-policy OSPF_Route_Policy sequence 1 match address W2_Loopback ! default action accept set metric 100 metric-type type1

Explanation

To provide OSPF neighbors access to a specific OMP-learned loopback route in a service-side VPN, the OMP route must be redistributed into OSPF using a route policy that filters for the exact prefix.

Common mistakes.

  • B. The configuration is for vpn 0 (the transport VPN) instead of a service-side VPN, and uses an incorrect /24 prefix for a loopback, which is typically /32.
  • C. The configuration is for vpn 0 (the transport VPN) instead of a service-side VPN, making it unsuitable for service-side routing.
  • D. The prefix-list uses an incorrect /24 prefix for a loopback, which would match a broader range of addresses than the specific /32 loopback intended.

Concept tested. OMP route redistribution into OSPF

Reference. https://www.cisco.com/c/en/us/td/docs/routers/sdwan/configuration/sdwan-xe-gs-book/m-routing-chapter.html#_Toc2227181

Topics

#OSPF Redistribution#SD-WAN Service VPN#Route Policy#OMP Routes

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