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300-410 Practice Question: Consider the following BGP configuration with…

Consider the following BGP configuration with BFD:

router bgp 65000
 neighbor 10.1.1.2 remote-as 65001
 neighbor 10.1.1.2 fall-over bfd

!

interface GigabitEthernet0/0
 ip address 10.1.1.1 255.255.255.252

bfd interval 200 min_rx 200 multiplier 4 !

What is the effect of the 'neighbor fall-over bfd' command?

Answer choices

Why each option matters

Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.

Correct answer & explanation

✓

BGP will use BFD for fast failure detection; if BFD goes down, BGP will reset the session immediately.

The 'neighbor fall-over bfd' command enables BGP to use BFD for fast failure detection. When BFD detects a failure, BGP will immediately tear down the peering session without waiting for the hold timer.

Answer analysis

Option-by-option breakdown

For each option: why learners choose it and why it is or isn't the right answer here.

  • ✗

    BGP will use BFD to detect link failures, but the BGP hold timer still applies.

    Why it's wrong here

    Fall-over BFD tears down the BGP session immediately when the BFD neighbour fails, so the hold timer is bypassed rather than still applying. It is tempting because BFD and BGP keepalives coexist, but BFD's rapid failure detection replaces the hold-timer wait for that neighbour.

  • ✗

    BGP will ignore the BFD session and continue using its own keepalive/hold mechanism.

    Why it's wrong here

    Fall-over BFD makes BGP track the BFD session, so a BFD failure resets the BGP neighbour instead of being ignored. It is tempting because BGP keepalives still run in parallel, but the command explicitly ties session teardown to BFD, not to the keepalive/hold mechanism alone.

  • ✓

    BGP will use BFD for fast failure detection; if BFD goes down, BGP will reset the session immediately.

    Why this is correct

    The fall-over bfd command ties BFD liveness to the BGP session, so a BFD failure triggers immediate session teardown rather than waiting for the BGP hold timer. This delivers sub-second failure detection for the 10.1.1.2 neighbour.

  • ✗

    The 'fall-over bfd' command is only needed if BFD timers are less than 100 ms.

    Why it's wrong here

    Fall-over BFD works with any BFD timer values; the 100 ms threshold is not a requirement. It is tempting because sub-second BFD is a common use case, but the command links BGP to the BFD session regardless of the configured interval, min_rx and multiplier values.

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JA

Written by Johnson Ajibi, MSc IT Security

Senior Network & Security Engineer · founder of Courseiva

This 300-410 practice question is part of Courseiva's free Cisco certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the 300-410 exam.