Quick Answer
The answer is that the LDP session is up and stable. This is confirmed by the "State: Oper" field in the show mpls ldp neighbor detail output, which indicates the Label Distribution Protocol session is operational, and the "Up time: 1w2d" showing it has been established for over a week without interruption. On the Cisco CCNP ENARSI 300-410 exam, this command is critical for troubleshooting MPLS L3VPN issues, as it verifies that label exchange between peers is functioning correctly; a common trap is mistaking a TCP connection for a fully operational session, but the "State: Oper" is the definitive indicator. The output also reveals the peer's LDP Ident (10.0.0.2:0), the discovery interface (GigabitEthernet0/0), and the bound addresses, which help confirm correct routing between the loopback and link interfaces. A useful memory tip: "Oper is the Operative word"—if you see "State: Oper" and a long uptime, the session is healthy, regardless of other counters.
This 300-410 practice question tests your understanding of mpls l3vpn. 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 an MPLS L3VPN issue:
R1# show mpls ldp neighbor detail
Output: Peer LDP Ident: 10.0.0.2:0, Local LDP Ident: 10.0.0.1:0 TCP connection: 10.0.0.2.646 - 10.0.0.1.17905 State: Oper, Msg sent: 123, Msg rcvd: 456 Up time: 1w2d LDP discovery sources: GigabitEthernet0/0, Src IP addr: 10.12.0.2 Addresses bound to peer LDP Ident:
10.0.0.2 10.12.0.2
Peer hold time: 15 sec
What does this output indicate?
The LDP session is up and stable
State is Oper, up time is 1w2d, indicating a stable session.
The LDP session is using UDP
Why wrong: LDP uses TCP, as shown by the TCP connection line.
The LDP session is down
Why wrong: State is Oper, meaning operational.
The LDP peer is using a different LDP ID
Why wrong: The peer LDP Ident is 10.0.0.2:0, which matches the expected.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
The LDP session is up and stable
The output shows LDP neighbor details. The peer is 10.0.0.2, the session is operational (State: Oper) and has been up for 1 week and 2 days. The discovery source is GigabitEthernet0/0 with source IP 10.12.0.2. The peer's addresses include 10.0.0.2 (loopback) and 10.12.0.2 (interface).
Key principle: OSPF neighbour adjacency depends on matching area, hello/dead timers, network type, and authentication — IP reachability alone is not enough.
Answer analysis
For each option: why learners choose it and why it is or isn't the right answer here.
The LDP session is up and stable
Why this is correct
State is Oper, up time is 1w2d, indicating a stable session.
Related concept
OSPF neighbours must agree on key parameters.
The LDP session is using UDP
Why it's wrong here
LDP uses TCP, as shown by the TCP connection line.
The LDP session is down
Why it's wrong here
State is Oper, meaning operational.
The LDP peer is using a different LDP ID
Why it's wrong here
The peer LDP Ident is 10.0.0.2:0, which matches the expected.
Common exam traps
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
LDP uses TCP, as shown by the TCP connection line.
Detailed technical explanation
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.
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
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.
What to study next
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.
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FAQ
MPLS L3VPN — This question tests MPLS L3VPN — OSPF neighbours must agree on key parameters..
The correct answer is: The LDP session is up and stable — The output shows LDP neighbor details. The peer is 10.0.0.2, the session is operational (State: Oper) and has been up for 1 week and 2 days. The discovery source is GigabitEthernet0/0 with source IP 10.12.0.2. The peer's addresses include 10.0.0.2 (loopback) and 10.12.0.2 (interface).
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.
OSPF neighbours must agree on key parameters.
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Same concept, more angles
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Variation 1. A network engineer runs the following command on Router P1: P1# show mpls ldp neighbor Peer LDP Ident: 10.0.0.2:0, Local LDP Ident: 10.0.0.1:0 TCP connection: 10.0.0.2.646 - 10.0.0.1.48632 State: Oper, Msgs sent/rcvd: 120/118, Downstream Up time: 00:12:34 LDP discovery sources: GigabitEthernet0/0, Src IP addr: 10.1.1.2 Addresses bound to peer LDP Ident: 10.0.0.2 192.168.1.1 Based on this output, which statement is correct?
mediumWhy B: The show mpls ldp neighbor output shows a single LDP neighbor with IP 10.0.0.2. The state is 'Oper' (operational), and the neighbor has been up for 12 minutes. The output indicates a healthy LDP session.
Last reviewed: Jun 18, 2026
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