The answer is that the route 10.2.2.0/24 is learned from neighbor 10.1.1.2 with an MPLS label of 20 and is the best path. This is correct because the `show bgp vpnv4 vrf` command reveals the BGP VPNv4 route details within a specific VRF context, showing that the route is valid, internal, and marked as best, with the outgoing MPLS label of 20 applied for label-switched forwarding. On the Cisco CCNP ENARSI 300-410 exam, this command tests your ability to troubleshoot VRF-Lite and MPLS VPN scenarios, where you must interpret the label stack and extended community RT:100:200 to verify correct route propagation. A common trap is confusing the incoming "nolabel" with the outgoing label—remember that "mpls labels in/out nolabel/20" means the router receives the route without a label but imposes label 20 when forwarding. Memory tip: "In/Out = No/20" — the outgoing label is the one that matters for the next hop.
300-410 VRF-Lite Practice Question
This 300-410 practice question tests your understanding of vrf-lite. The scenario asks you to isolate a root cause — eliminate options that address a different problem before choosing. 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.
A network engineer runs the following command to troubleshoot a VRF-Lite BGP route advertisement issue:
R1# show bgp vpnv4 vrf CUSTOMER_D 10.2.2.0/24
Output:
BGP routing table entry for 10.2.2.0/24, version 5
Paths: (1 available, best #1, table CUSTOMER_D)
Advertised to update-groups:
1
Refresh Epoch 1
Local
Noticing these words before you look at the options changes how you read each choice.
Clue: "best"
Why it matters: Signals that multiple options may be partially correct. Choose the option that most directly solves the exact problem described, not the one that sounds most complete.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
The route 10.2.2.0/24 is learned from 10.1.1.2 with an MPLS label of 20 and is the best path.
The 'show bgp vpnv4 vrf' command displays BGP VPNv4 route details for a specific VRF. The output shows route 10.2.2.0/24 is learned from neighbor 10.1.1.2 (router ID 2.2.2.2) with a metric of 20. It is valid, internal, and the best path. The route has an extended community RT:100:200 and an MPLS label of 20 (outgoing).
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.
✗
The route 10.2.2.0/24 is learned via an external BGP peer and is not the best path.
Why it's wrong here
Incorrect. The path is internal (iBGP) and is marked as best.
✓
The route 10.2.2.0/24 is learned from 10.1.1.2 with an MPLS label of 20 and is the best path.
Why this is correct
Correct. The output shows the route is internal, best, and has an MPLS label of 20.
Clue confirmation
The clue word "best" in the question point toward this answer.
The route 10.2.2.0/24 is not advertised to any update groups.
Why it's wrong here
Incorrect. It is advertised to update-group 1.
✗
The route 10.2.2.0/24 has no extended community attached.
Why it's wrong here
Incorrect. The output shows Extended Community: RT:100:200.
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
Incorrect. The output shows Extended Community: RT:100:200.
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.
VRF-Lite — This question tests VRF-Lite — OSPF neighbours must agree on key parameters..
What is the correct answer to this question?
The correct answer is: The route 10.2.2.0/24 is learned from 10.1.1.2 with an MPLS label of 20 and is the best path. — The 'show bgp vpnv4 vrf' command displays BGP VPNv4 route details for a specific VRF. The output shows route 10.2.2.0/24 is learned from neighbor 10.1.1.2 (router ID 2.2.2.2) with a metric of 20. It is valid, internal, and the best path. The route has an extended community RT:100:200 and an MPLS label of 20 (outgoing).
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.
Are there clue words in this question I should notice?
Yes — watch for: "best". Signals that multiple options may be partially correct. Choose the option that most directly solves the exact problem described, not the one that sounds most complete.
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 R1:
R1# show ip bgp vpnv4 vrf RED summary
BGP router identifier 192.168.0.1, local AS number 65001
BGP table version is 5, main routing table version 5
4 network entries using 576 bytes of memory
4 path entries using 320 bytes of memory
2/1 BGP path/bestpath attribute entries using 320 bytes of memory
0 BGP route-map cache entries using 0 bytes of memory
0 BGP filter-list cache entries using 0 bytes of memory
BGP using 1216 total bytes of memory
BGP activity 4/0 prefixes, 4/0 paths, scan interval 60 secs
Neighbor V AS MsgRcvd MsgSent TblVer InQ OutQ Up/Down State/PfxRcd
10.1.1.2 4 65001 23 25 5 0 0 00:12:34 2
10.1.2.2 4 65002 18 20 5 0 0 00:10:15 1
Based on this output, which statement is correct?
medium
✓ A.Both BGP neighbors are in the Established state.
B.Neighbor 10.1.2.2 is in the Idle state.
C.The local AS number is 65002.
D.Neighbor 10.1.1.2 is in AS 65002.
Why A: The 'show bgp vpnv4 vrf RED summary' command displays BGP neighbors for VRF RED. It shows two neighbors: 10.1.1.2 (AS 65001) and 10.1.2.2 (AS 65002). Both are in the Established state with prefixes received. The neighbor 10.1.1.2 has received 2 prefixes, and 10.1.2.2 has received 1 prefix.
Variation 2. A network engineer runs the following command on Router R1:
R1# show ip bgp vpnv4 vrf RED neighbors 10.1.1.2 advertised-routes
BGP table version is 5, local router ID is 192.168.0.1
Status codes: s suppressed, d damped, h history, * valid, > best, i - internal,
r RIB-failure, S Stale, m multipath, b backup-path, f RT-Filter,
x best-external, a additional-path, c RIB-compressed,
t secondary path, L long-lived-stale,
Origin codes: i - IGP, e - EGP, ? - incomplete
Network Next Hop Metric LocPrf Weight Path
*> 192.168.1.0/24 0.0.0.0 0 32768 i
*> 192.168.2.0/24 0.0.0.0 0 32768 i
Total number of prefixes 2
Based on this output, what is the problem?
hard
A.The routes are advertised with next hop 0.0.0.0, which will cause the neighbor to drop them.
✓ B.The routes are being advertised correctly.
C.The BGP table version is 5, indicating a problem.
D.The routes have weight 0, which is incorrect.
Why B: The output shows the routes advertised to BGP neighbor 10.1.1.2 for VRF RED. It advertises two networks: 192.168.1.0/24 and 192.168.2.0/24, both with next hop 0.0.0.0 (meaning self). This is normal. However, the next hop 0.0.0.0 might be problematic if the neighbor expects a valid next hop. But in BGP, 0.0.0.0 is used for locally originated routes. The problem could be that the routes are not being advertised with the correct next hop, but for VRF-Lite, this is typical. Actually, no problem is evident. The correct answer might be that the routes are being advertised correctly.
Last reviewed: Jun 18, 2026
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