300-420 · Question #112
300-420 Question #112: Real Exam Question with Answer & Explanation
The correct answer is B: BFD runs on the IPsec tunnels between WAN Edge routers.. Maintain/monitor-maintain-book/m-network.html The Role of BFD in Cisco SD-WAN Solution The BFD protocol detects links failures between routers. It measures data loss and latency on the data tunnel to determine the status of the devices at either end of the connection. For data pl
Question
How is sub-second failure of a transport link detected in a Cisco SD-WAN network?
Options
- AHellos are sent between the WAN Edge routers and the vSmart controller.
- BBFD runs on the IPsec tunnels between WAN Edge routers.
- CBGP is used between WAN Edge routers and the vSmart controller.
- DLink state change messages are sent between vSmart controllers.
Explanation
Maintain/monitor-maintain-book/m-network.html The Role of BFD in Cisco SD-WAN Solution The BFD protocol detects links failures between routers. It measures data loss and latency on the data tunnel to determine the status of the devices at either end of the connection. For data plane resiliency, the Cisco SD-WAN software implements the BFD protocol, which runs automatically on the secure IPsec and GRE connections between routers. These connections are used for the data plane, and for data traffic, and are independent of the DTLS tunnels used by the
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