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300-410 Practice Question: Which THREE symptoms indicate a potential MPLS…
Which THREE symptoms indicate a potential MPLS label switching issue on a Cisco router? (Choose THREE.)
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 output of 'show mpls forwarding-table' shows 'no label' for a specific prefix.
MPLS issues often manifest as incorrect label operations. 'show mpls forwarding-table' showing 'no label' for a route indicates a missing label binding. 'show mpls ldp neighbor' showing 'state: OPERATIONAL' is normal, not a symptom. 'debug mpls ldp errors' showing 'Label bindings not received' indicates a problem. 'show mpls forwarding-table' showing 'Pop tag' for a non-egress router suggests a misconfiguration. 'show mpls interfaces' showing 'IP' only (not MPLS) indicates MPLS is not enabled on the interface.
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 output of 'show mpls forwarding-table' shows 'no label' for a specific prefix.
Why this is correct
This indicates that the router has not received a label binding for that prefix from its LDP neighbor, causing packets to be forwarded without MPLS.
- ✗
The output of 'show mpls ldp neighbor' shows 'state: OPERATIONAL' for all neighbors.
Why it's wrong here
This is a normal, healthy state for LDP neighbors, not a symptom of an issue.
- ✓
The output of 'debug mpls ldp errors' shows 'Label bindings not received from peer'.
Why this is correct
This indicates that the router is not receiving label bindings from an LDP peer, which can cause forwarding failures.
- ✓
The output of 'show mpls forwarding-table' shows 'Pop tag' for a prefix on a router that is not the egress LSR.
Why this is correct
The 'Pop tag' operation should only appear on the penultimate hop router (PHP). If it appears on a non-egress router, it indicates a label distribution problem.
- ✗
The output of 'show mpls interfaces' shows 'IP' only for an interface configured for MPLS.
Why it's wrong here
If an interface is configured for MPLS, 'show mpls interfaces' should show 'IP' and 'MPLS'. Showing only 'IP' means MPLS is not enabled, which is a configuration issue, but it is not a symptom of a label switching issue per se—it is a missing configuration.
Go deeper
Related to this question
Learn chapter
OSPF Neighbor Adjacency and Basics
Key term
MPLS Label Distribution
MPLS Label Distribution is the process by which routers exchange labels that tell them how to forward packets across a network without looking at the IP address each time.
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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