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300-410 Practice Question: Runs the following command to troubleshoot a…
A network engineer runs the following command to troubleshoot a VRF-Lite MPLS LDP issue:
R1# show mpls ldp bindings vrf CUSTOMER_F
Output: lib entry: 10.4.4.0/24, rev 2 local binding: label: 16 remote binding: lsr: 2.2.2.2:0, label: 20 lib entry: 10.5.5.0/24, rev 3 local binding: label: 17 remote binding: lsr: 2.2.2.2:0, label: 21
What does this output indicate?
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 VRF CUSTOMER_F has two prefixes with local labels 16 and 17, and remote labels 20 and 21 from LSR 2.2.2.2.
The 'show mpls ldp bindings vrf' command displays MPLS label bindings for a specific VRF. The output shows two prefixes (10.4.4.0/24 and 10.5.5.0/24) with local labels (16 and 17) and remote labels (20 and 21) from LSR 2.2.2.2. This indicates that LDP has successfully exchanged labels for these prefixes within the VRF.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
MPLS LDP has not established a session with the remote LSR 2.2.2.2.
Why it's wrong here
Incorrect. Remote bindings are present, indicating a successful LDP session.
- ✓
The VRF CUSTOMER_F has two prefixes with local labels 16 and 17, and remote labels 20 and 21 from LSR 2.2.2.2.
Why this is correct
Correct. The output shows local and remote label bindings for two prefixes.
- ✗
The labels are not being used because the VRF is not configured correctly.
Why it's wrong here
Incorrect. The bindings are present and valid.
- ✗
The remote LSR is using the same labels as the local router.
Why it's wrong here
Incorrect. Local labels (16,17) differ from remote labels (20,21).
Go deeper
Related to this question
Learn chapter
Introduction to ENARSI Exam and Network Fundamentals
Key term
MPLS Layer 3 VPN
A technology that uses Multiprotocol Label Switching to create secure, scalable virtual private networks that connect multiple sites at the network layer, where the service provider manages routing between customer sites.
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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