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Implementing and Operating Cisco Enterprise Network Core Technologies (ENCOR) · Cisco
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BFD is correct Cisco Catalyst SD-WAN BFD This type of BFD detects failures in the overlay tunnel and has the following haracteristics: Is enabled by default and cannot be disabled. Is typically enabled for the Cisco Catalyst SD-WAN Overlay Management Protocol (OMP). Besides link failures, Cisco Catalyst SD-WAN BFD also measures latency, loss, jitter, and other link statistics used by application-aware routing. For more information on Cisco Catalyst SD-WAN BFD for measuring latency, loss, and jitter used by application-aware routing, see https://www.cisco.com/c/en/us/td/docs/routers/sdwan/configuration/policies/ios-xe-17/policies-book-xe/application-aware-routing.html.
https://sdwan-docs.cisco.com/Product_Documentation/Software_Features/SD-WAN_Release_17.1/07Policy_Applications/01Application-Aware_Routing The Viptela software uses BFD packets to continuously monitor the data traffic on the data plane tunnels between vEdge routers Application-aware routing uses the BFD Hello packets to measure the loss, latency, and jitter on the links.
B is The Correct Answer