The correct commands are show mpls forwarding-table and show ip bgp vpnv4 vrf CUSTOMER_A labels, as these two directly reveal the MPLS L3VPN label forwarding table on a PE router. The show mpls forwarding-table command displays the Label Forwarding Information Base (LFIB), which maps incoming labels to outgoing interfaces and next hops for all VPNv4 prefixes, while show ip bgp vpnv4 vrf CUSTOMER_A labels shows the specific label assigned by the local PE for prefixes within a given VRF. On the Cisco CCNP ENARSI 300-410 exam, this question tests your ability to distinguish between control-plane label bindings (LDP) and data-plane forwarding labels, with a common trap being to confuse show mpls ldp bindings, which only shows LDP neighbor agreements, not the actual forwarding table. Remember that the LFIB is the router’s active forwarding map, so if you need to verify which label is being pushed for a VPN route, think “forwarding-table” for the hardware path and “bgp vpnv4 vrf labels” for the BGP-assigned tag.
300-410 MPLS L3VPN Practice Question
This 300-410 practice question tests your understanding of mpls l3vpn. Examine the command output carefully: the correct answer depends on what the output actually shows, not on general recall alone. After answering, compare your reasoning against the explanation and wrong-answer breakdown below. Once you have made your selection, read the full explanation to reinforce the concept and understand why each distractor is designed to mislead on exam day.
Which TWO commands can be used to verify the MPLS L3VPN label forwarding table on a PE router? (Choose TWO.)
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
show mpls forwarding-table
The 'show mpls forwarding-table' displays the LFIB with labels and next hops for all VPNv4 prefixes. The 'show ip bgp vpnv4 vrf <vrf-name> labels' shows the label assigned by the local PE for prefixes in a specific VRF. 'show mpls ldp bindings' shows LDP label bindings, not VPN labels. 'show ip route vrf <vrf-name>' shows the routing table, not labels. 'show bgp vpnv4 unicast all labels' is a valid alternative but not listed; 'show ip bgp vpnv4 vrf' with labels is correct.
Key principle: OSPF neighbour adjacency depends on matching area, hello/dead timers, network type, and authentication — IP reachability alone is not enough.
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 mpls forwarding-table
Why this is correct
Displays the LFIB including VPN labels for all prefixes.
Shows LDP label bindings for IGP routes, not VPN labels.
✗
show ip route vrf CUSTOMER_A
Why it's wrong here
Shows the VRF routing table, not label information.
✗
show mpls ldp neighbor
Why it's wrong here
Displays LDP neighbor status, not label forwarding.
Common exam traps
Common exam trap: OSPF can fail even when IP connectivity looks correct
OSPF neighbour formation depends on matching areas, timers, network type, authentication and passive-interface behaviour. Do not choose an answer only because the devices can ping.
Trap categories for this question
Command / output trap
Shows LDP label bindings for IGP routes, not VPN labels.
Detailed technical explanation
How to think about this question
OSPF questions usually test the details that control adjacency and route selection. Read the neighbour state, area, router ID and interface configuration before deciding what is wrong.
KKey Concepts to Remember
OSPF neighbours must agree on key parameters.
Router ID selection can affect neighbour relationships and LSDB output.
OSPF cost influences the preferred path.
A route can appear in OSPF information but not become the installed route.
TExam Day Tips
→Check area mismatch first when OSPF adjacency fails.
→Review passive interfaces when a network is advertised but no neighbour forms.
→Use show ip ospf neighbor and show ip route clues carefully.
Key takeaway
OSPF neighbour adjacency depends on matching area, hello/dead timers, network type, and authentication — IP reachability alone is not enough.
Real-world example
How this comes up in practice
A network engineer at a university connects two campus buildings via a fibre link. Both routers run OSPF, but no adjacency forms — even though both routers can ping each other. The engineer finds one router is in area 0 and the other in area 1. OSPF adjacency requires matching area numbers, hello/dead timers, and network type. IP reachability alone is not enough.
Related glossary terms
Concepts from this question explained
These glossary pages explain the core terms tested in this 300-410 question in full detail.
Review OSPF neighbour requirements — matching area type, hello and dead timers, network type, stub flags, and authentication. Study show ip ospf neighbor states (INIT, 2-WAY, FULL). Then practise related 300-410 OSPF questions on adjacency and route selection.
MPLS L3VPN — This question tests MPLS L3VPN — OSPF neighbours must agree on key parameters..
What is the correct answer to this question?
The correct answer is: show mpls forwarding-table — The 'show mpls forwarding-table' displays the LFIB with labels and next hops for all VPNv4 prefixes. The 'show ip bgp vpnv4 vrf <vrf-name> labels' shows the label assigned by the local PE for prefixes in a specific VRF. 'show mpls ldp bindings' shows LDP label bindings, not VPN labels. 'show ip route vrf <vrf-name>' shows the routing table, not labels. 'show bgp vpnv4 unicast all labels' is a valid alternative but not listed; 'show ip bgp vpnv4 vrf' with labels is correct.
What should I do if I get this 300-410 question wrong?
Review OSPF neighbour requirements — matching area type, hello and dead timers, network type, stub flags, and authentication. Study show ip ospf neighbor states (INIT, 2-WAY, FULL). Then practise related 300-410 OSPF questions on adjacency and route selection.
What is the key concept behind this question?
OSPF neighbours must agree on key parameters.
About these practice questions
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These questions test the same concept from different angles. Work through them to make sure you can recognise it however the exam phrases it.
Variation 1. A network engineer runs the following command on Router PE7:
PE7# show bgp vpnv4 unicast vrf CUSTOMER_E labels
Network Next Hop In Label/Out Label
10.10.10.0/24 10.0.0.8 18/22
10.20.20.0/24 10.0.0.9 19/23
Based on this output, which statement is correct?
medium
✓ A.The router is correctly assigning labels for VPNv4 routes.
B.The router is not receiving labels from its BGP peers.
C.The VRF CUSTOMER_E has no routes.
D.The label allocation is failing.
Why A: The show bgp vpnv4 unicast vrf labels command displays the label bindings for VPNv4 routes in a VRF. Each entry shows the incoming label (assigned locally) and outgoing label (assigned by the next hop). The output shows correct label assignments for two prefixes.
Last reviewed: Jun 18, 2026
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