mediumMultiple Choice
300-410 Practice Question: Runs the following command on Router R1: R1# show…
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
10.1.12.2 from 10.1.12.2 (10.2.2.2)
Origin IGP, metric 0, localpref 100, valid, external, best rx pathid: 0, tx pathid: 0x0
Based on this output, what is a potential issue with this route?
⚠ Common exam trap
The trap is that candidates focus on local preference or next-hop reachability, but the explicit 'Not advertised to any peer' line points to outbound filtering — the exam tests whether you read the status flags rather than assume a path-selection problem.
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
✓
The route is not being advertised to any BGP peer, possibly due to outbound filtering.
The output line 'Not advertised to any peer' means R1 is not sending this prefix to any BGP neighbor, which typically indicates outbound route filtering (e.g., a distribute-list, prefix-list, or route-map applied outbound) or a missing network statement advertisement. The route itself is valid, external, and best, so the issue is advertisement, not reachability or installation. This is a common BGP troubleshooting signal.
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 the default value, so it cannot be the fault here; the genuine anomaly is the 'Not advertised to any peer' line, meaning no outbound filtering or session is propagating it. Local preference manipulation only matters when comparing multiple paths, and this route has just one.
- ✓
The route is not being advertised to any BGP peer, possibly due to outbound filtering.
Why this is correct
The 'Not advertised to any peer' line shows the best path is not being sent to any BGP neighbour, which typically results from outbound route filtering, a missing neighbour advertisement or an unsynchronised peer. This satisfies the stem's request for a potential issue.
- ✗
The next hop 10.1.12.2 is unreachable.
Why it's wrong here
The output marks the path 'valid', which confirms the next hop resolved successfully in the RIB, so reachability is not in question. Next-hop validation is the correct check when a path shows 'inaccessible', but here the real anomaly is the 'Not advertised to any peer' line.
- ✗
The route is not installed in the routing table.
Why it's wrong here
'Best' plus 'valid' and 'table default' confirms the route was selected and installed in the routing table. Checking installation is the right instinct when a path is marked 'not best' or filtered, but this entry is already active and forwarding.
Go deeper
Related to this question
Learn chapter
BGP Basics and Neighbor Relationships
Key term
ACL for Routing Protocols
An ACL for Routing Protocols is a set of rules used to filter routing updates between routers, controlling which network routes are advertised or accepted to improve security and stability.
Key term
BGP Prefix Filtering
BGP Prefix Filtering is the practice of controlling which network routes (prefixes) a router accepts or advertises to its BGP neighbors, preventing unwanted or harmful routes from spreading across the internet.
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Same concept, more angles
1 more way this is tested on 300-410
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 'Not advertised to any peer' line in the BGP table entry indicates that R1 is not sending this prefix to any of its BGP neighbors, even though the route is valid and marked as best. Since the session is up (the route was received from 10.1.16.6) and the route is in the BGP table, the most likely cause is an outbound filter — a route-map, prefix-list, or distribute-list applied in the outbound direction on the neighbor statement — that is suppressing advertisement. Local preference of 100 is the default and has no bearing on whether a route is advertised.
JA
Written and reviewed by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
Last reviewed September 2026 · checked against the official Cisco exam blueprint
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