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300-410 Practice Question: Which THREE commands can be used to verify the…
Which THREE commands can be used to verify the MPLS label assigned to a specific prefix in a VRF on a PE 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
✓
show ip bgp vpnv4 vrf CUSTOMER 10.1.1.0/24
To check the MPLS label for a VRF prefix, an engineer can use 'show ip bgp vpnv4 vrf <name> <prefix>' to see the BGP label, 'show mpls forwarding-table vrf <name> <prefix>' to see the label used in forwarding, and 'show ip cef vrf <name> <prefix> detail' to see the label in the CEF entry. 'show ip route vrf' does not show MPLS labels. 'show mpls ldp bindings' shows local and remote label bindings, but not specifically for a VRF prefix without additional filtering.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
show ip bgp vpnv4 vrf CUSTOMER 10.1.1.0/24
Why this is correct
Correct. This command displays the BGP table entry for the prefix, including the MPLS label.
- ✗
show ip route vrf CUSTOMER 10.1.1.0/24
Why it's wrong here
Incorrect. The IP routing table does not show MPLS labels; it shows next-hop and interface.
- ✓
show mpls forwarding-table vrf CUSTOMER 10.1.1.0/24
Why this is correct
Correct. This shows the LFIB entry for the prefix, including the outgoing label.
- ✓
show ip cef vrf CUSTOMER 10.1.1.0/24 detail
Why this is correct
Correct. The detailed CEF output includes the label stack for the prefix.
- ✗
show mpls ldp bindings prefix 10.1.1.0/24
Why it's wrong here
Incorrect. This command shows LDP bindings, but not in the context of a specific VRF; it may show labels but not the VRF-specific label assignment.
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Related to this question
Learn chapter
OSPF Route Summarization and Filtering
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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