How is sub-second failure of a transport link detected in a Cisco SD-WAN network?
A) Hellos are sent between the WAN Edge routers and the vSmart controller.
B) BFD runs on the IPsec tunnels between WAN Edge routers.
C) BGP is used between WAN Edge routers and the vSmart controller.
D) Link state change messages are sent between vSmart controllers.

Question

Quizplus · Accepted Answer

BFD (Bidirectional Forwarding Detection) runs on the IPsec tunnels between WAN Edge routers to detect sub-second failures by quickly identifying link failures.

How Is Sub-Second Failure of a Transport Link Detected in a Cisco