300-415 Question #230: Real Exam Question with Answer & Explanation

The correct answer is D: 6. In Cisco SD-WAN, the BFD Multiplier defines how many consecutive BFD hello packets must be missed before a tunnel is declared down. The default value is 6. Combined with the default BFD poll interval (1000 ms), this means a tunnel failure is detected after 6 missed hellos - rough

Router Deployment

Question

What is the default value for the Multiplier field of the BFD basic configuration in vManage?

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Explanation

In Cisco SD-WAN, the BFD Multiplier defines how many consecutive BFD hello packets must be missed before a tunnel is declared down. The default value is 6. Combined with the default BFD poll interval (1000 ms), this means a tunnel failure is detected after 6 missed hellos - roughly 6 seconds by default. This relatively conservative default prevents false positives on transient WAN flaps. The multiplier can be tuned lower for faster failure detection at the cost of greater sensitivity to brief packet loss.

Topics

#BFD#vManage#Default values#SD-WAN configuration

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