A branch office has a primary L3VPN MPLS connection back to the main office and an IPSEC VPN tunnel that serves as backup. Which design ensures that data is sent over the backup connection only if the primary MPLS circuit is down?
A.
Use EIGRP to establish a neighbor relationship with the main office via L3VPN MPLS and the IPSEC VPN tunnel.
B.
Use BGP with the multipath feature enabled to force traffic via the primary path when available.
C.
Use static routes tied to an IP SLA to prefer the primary path while a floating static route points to the backup connection.
D.
Use OSPF with a passive-interface command on the backup connection.
C. Use static routes tied to an IP SLA to prefer the primary path while a floating static route points to the backup connection.
Using static routes with IP SLA tracking allows you to prefer the primary L3VPN MPLS connection when it is available and automatically failover to the backup IPSEC VPN tunnel when the primary connection goes down. IP SLA tracking monitors the primary path's availability and adjusts the routing table accordingly. The floating static route, with a higher administrative distance, serves as a backup route that only becomes active when the primary route is unavailable. This design ensures that data is sent over the backup connection only if the primary MPLS circuit is down.
EIGRP neighborship through the (non-VTI) tunnel is the problem. Answer C should be the right one.
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