The answer is that outbound filtering is preventing the route from being advertised to any BGP peer. The `show bgp ipv4 unicast 10.2.2.0/24` output clearly shows the route is valid, best, and learned from an eBGP neighbor, yet the critical line “Not advertised to any peer” indicates a propagation failure. This typically occurs when an outbound route-map, prefix-list, or distribute-list is filtering the route before it reaches neighbors, or when the neighbor is not explicitly configured with the `network` statement or `redistribute` command for that prefix. On the Cisco CCNP ENARSI 300-410 exam, this scenario tests your ability to differentiate between a route being received versus being advertised—a common trap is assuming a “best” route is automatically sent to all peers. Remember the memory tip: “Best does not mean broadcast; check your outbound list.” Always verify both inbound and outbound policy when a valid route remains silent.
300-410 BGP Troubleshooting Practice Question
This 300-410 practice question tests your understanding of bgp troubleshooting. 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 on Router R1:
R1# show bgp ipv4 unicast 10.2.2.0/24
BGP routing table entry for 10.2.2.0/24, version 5
Paths: (1 available, best #1, table default)
Not advertised to any peer
Refresh Epoch 1
65002
Based on this output, what is a potential issue with this route?
Clue words in this question
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.
Why wrong: Local preference 100 is default and not an issue.
B
The route is not being advertised to any BGP peer, possibly due to outbound filtering.
The output explicitly states 'Not advertised to any peer', indicating a filtering or configuration issue preventing advertisement.
C
The next hop 10.1.12.2 is unreachable.
Why wrong: If the next hop were unreachable, the route would not be valid or best.
D
The route is not installed in the routing table.
Why wrong: The output does not show routing table status, but the route is best in BGP, so it should be installed unless there is a higher administrative distance route.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
The route is not being advertised to any BGP peer, possibly due to outbound filtering.
The route is valid and best, but it is 'Not advertised to any peer'. This could be due to outbound filtering, such as a route-map, prefix-list, or the neighbor not being configured to receive the route. The route is learned from an eBGP peer but not being propagated.
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 has a low local preference of 100.
Why it's wrong here
Local preference 100 is default and not an issue.
✓
The route is not being advertised to any BGP peer, possibly due to outbound filtering.
Why this is correct
The output explicitly states 'Not advertised to any peer', indicating a filtering or configuration issue preventing advertisement.
Clue confirmation
The clue word "best" in the question point toward this answer.
If the next hop were unreachable, the route would not be valid or best.
✗
The route is not installed in the routing table.
Why it's wrong here
The output does not show routing table status, but the route is best in BGP, so it should be installed unless there is a higher administrative distance route.
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
The output does not show routing table status, but the route is best in BGP, so it should be installed unless there is a higher administrative distance route.
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.
BGP Troubleshooting — This question tests BGP Troubleshooting — OSPF neighbours must agree on key parameters..
What is the correct answer to this question?
The correct answer is: The route is not being advertised to any BGP peer, possibly due to outbound filtering. — The route is valid and best, but it is 'Not advertised to any peer'. This could be due to outbound filtering, such as a route-map, prefix-list, or the neighbor not being configured to receive the route. The route is learned from an eBGP peer but not being propagated.
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 bgp ipv4 unicast 10.4.4.0/24
BGP routing table entry for 10.4.4.0/24, version 8
Paths: (1 available, best #1, table default)
Not advertised to any peer
Refresh Epoch 1
65006
10.1.16.6 from 10.1.16.6 (10.6.6.6)
Origin IGP, metric 0, localpref 100, valid, external, best
rx pathid: 0, tx pathid: 0x0
Based on this output, what is the most likely reason the route is not advertised to any peer?
hard
A.The route has a local preference of 100, which is too low.
✓ B.There is an outbound route-map or prefix-list filtering the route.
C.The BGP session to the neighbor is down.
D.The route is not in the routing table.
Why B: The route is valid and best, but not advertised. This could be due to outbound filtering (route-map, prefix-list) applied to the BGP neighbor, or the neighbor might not be configured to receive this prefix. Another possibility is that the route is suppressed by a policy.
Last reviewed: Jun 18, 2026
Question Discussion
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