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300-410 Practice Question: Configures IP SLA to track a BGP next-hop for a…
A network engineer configures IP SLA to track a BGP next-hop for a backup path. Router R1 has:
ip sla 7
icmp-echo 192.168.3.3 source-ip 10.0.0.1 frequency 5
ip sla schedule 7 life forever start-time now track 7 ip sla 7 reachability router bgp 65001 neighbor 192.168.3.3 remote-as 65003 neighbor 192.168.3.3 fall-over bfd neighbor 192.168.3.3 track 7
But when the link to 192.168.3.3 goes down, the BGP session resets after 5 seconds, but the backup route is not used immediately. What is the root cause?
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
✓
The BGP fall-over bfd overrides the track, so the BGP session resets via BFD, but the track remains up, preventing the backup route from being installed.
The BGP fall-over bfd and track 7 are both configured. When the link goes down, BFD detects the failure quickly and resets the BGP session. However, the track 7 might still be up because the IP SLA probe might be successful via an alternate path, so the tracked route is not removed. The correct answer is that the track 7 is not used because BFD takes precedence, and the track does not influence the route removal.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
The BGP fall-over bfd overrides the track, so the BGP session resets via BFD, but the track remains up, preventing the backup route from being installed.
Why this is correct
When BFD is used, the track is ignored for BGP session reset, but the track might still be up, so the static route associated with the track is not removed, causing the backup route to not be used.
- ✗
The IP SLA frequency is too low, so the track does not detect the failure quickly enough.
Why it's wrong here
The track is not the issue; BFD is faster.
- ✗
The backup route has a higher administrative distance, so it is not installed until the primary route is removed, but the primary route is still present.
Why it's wrong here
The primary route is removed when the track goes down, but the track is still up.
- ✗
The track 7 is not applied to the BGP neighbor correctly; it should be under the address-family.
Why it's wrong here
The track can be applied directly to the neighbor.
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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.