300-415 · Question #26
What is the default interval for BFD packets?
The correct answer is A. 1 second. The default interval for BFD (Bidirectional Forwarding Detection) packets is 1 second.
Question
Options
- A1 second
- B15 seconds
- C10 seconds
- D5 seconds
How the community answered
(29 responses)- A86% (25)
- B3% (1)
- C3% (1)
- D7% (2)
Why each option
The default interval for BFD (Bidirectional Forwarding Detection) packets is 1 second.
By default, BFD packets are exchanged between neighbors every 1 second (1000 milliseconds). This rapid interval is crucial for BFD's primary purpose of quickly detecting link failures or path disruptions, thereby ensuring fast convergence in the network.
15 seconds is not the default BFD interval; it is a common interval for other routing protocol timers or less aggressive BFD settings.
10 seconds is not the default BFD interval; it is often associated with other routing protocol hello/dead timers.
5 seconds is not the default BFD interval, though it is a configurable option for BFD intervals.
Concept tested: Default BFD hello interval.
Source: https://www.cisco.com/c/en/us/td/docs/routers/sdwan/command/sdwan-cr-book/cmd-system.html#wp4150821550
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