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300-410 Practice Question: Is troubleshooting MPLS TE where a tunnel is…
A network engineer is troubleshooting MPLS TE where a tunnel is configured with explicit path but the tunnel remains down. The show mpls traffic-eng tunnels command shows 'Path computation failed' and the show mpls traffic-eng topology command shows that the explicit path includes a router that is not in the TED. What is the most likely 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 router in the explicit path does not have MPLS TE enabled.
The explicit path includes a router that is not in the TED, meaning the headend cannot find that router in the traffic engineering database. This is because MPLS TE is not enabled on that router or its interfaces, so its link attributes are not advertised.
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 router in the explicit path does not have MPLS TE enabled.
Why this is correct
Correct because for a router to appear in the TED, MPLS TE must be enabled globally and on its interfaces; otherwise, the headend cannot include it in the path.
- ✗
The explicit path is configured with a loose next-hop.
Why it's wrong here
Incorrect because loose next-hops are allowed in explicit paths; the issue is that the router is not in the TED at all.
- ✗
The tunnel destination is not reachable via the IGP.
Why it's wrong here
Incorrect because TE tunnels do not require IGP reachability to the destination; they use the TED for path computation.
- ✗
The mpls traffic-eng tunnels command is missing on the headend.
Why it's wrong here
Incorrect because the tunnel is configured and the headend is attempting path computation; the command is present.
Go deeper
Related to this question
Learn chapter
Introduction to ENARSI Exam and Network Fundamentals
Key term
LDP Protocol
LDP, or Label Distribution Protocol, is a protocol that routers use to automatically exchange labels that enable MPLS (Multiprotocol Label Switching) to create fast, efficient paths for data packets across a network.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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