350-401 · Question #178
In a Cisco SD-WAN solution, how is the health of a data plane tunnel monitored?
The correct answer is C. using BFD. In Cisco SD-WAN, Bidirectional Forwarding Detection (BFD) is the primary mechanism used to actively monitor the health and liveness of data plane tunnels between vEdge or cEdge routers.
Question
In a Cisco SD-WAN solution, how is the health of a data plane tunnel monitored?
Options
- Awith IP SLA
- BARP probing
- Cusing BFD
- Dwith OMP
How the community answered
(55 responses)- A2% (1)
- B2% (1)
- C93% (51)
- D4% (2)
Why each option
In Cisco SD-WAN, Bidirectional Forwarding Detection (BFD) is the primary mechanism used to actively monitor the health and liveness of data plane tunnels between vEdge or cEdge routers.
IP SLA is a Cisco IOS feature for network performance monitoring, but in Cisco SD-WAN, BFD is specifically used for rapid data plane tunnel health monitoring.
ARP probing is used for address resolution and host reachability within a local segment, not for monitoring the health of data plane tunnels across a WAN.
BFD provides rapid detection of forwarding path failures between two routers by continuously sending small packets at a high frequency over the data plane tunnels. This quick detection identifies if a tunnel is down or experiencing issues, enabling fast rerouting in the SD-WAN fabric.
OMP (Overlay Management Protocol) is the routing protocol for the Cisco SD-WAN control plane, responsible for exchanging routing and policy information, but it does not directly monitor the data plane tunnel health itself.
Concept tested: Cisco SD-WAN data plane tunnel monitoring
Source: https://www.cisco.com/c/en/us/td/docs/routers/sdwan/configuration/sdwan-xe-gs-book/sdwan-basic-config.html#_Ref81232
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