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300-410 Practice Question: An engineer configures BGP between two iBGP peers…
An engineer configures BGP between two iBGP peers in the same AS. The engineer sets 'next-hop-self' on the neighbor statement. However, the routes received from the iBGP peer still show the original next-hop as unreachable. What is the most likely explanation?
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 'next-hop-self' command was applied under the wrong address-family.
The 'next-hop-self' command in BGP modifies the next-hop attribute for routes advertised to the neighbor. However, if the route is received from an eBGP peer and then advertised to an iBGP peer, the next-hop is changed only for the iBGP peer if 'next-hop-self' is configured. But if the iBGP peer is also a route reflector client, the route reflector does not change the next-hop unless 'next-hop-self' is configured on the route reflector itself. The edge case here is that the engineer may have configured 'next-hop-self' on the wrong router or the command is applied to the wrong address-family.
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 'next-hop-self' command was applied under the wrong address-family.
Why this is correct
In BGP, 'next-hop-self' can be configured per address-family. If it is applied under the IPv4 unicast address-family but the routes are being exchanged in a different address-family (e.g., VPNv4), it will not take effect.
- ✗
The 'next-hop-self' command is not supported for iBGP peers.
Why it's wrong here
'next-hop-self' is fully supported for iBGP peers and is commonly used to ensure reachability.
- ✗
The 'synchronization' command is enabled, causing the next-hop to be preserved.
Why it's wrong here
BGP synchronization is disabled by default in modern IOS and does not affect next-hop processing.
- ✗
The 'bgp bestpath as-path multipath-relax' command is interfering.
Why it's wrong here
This command affects multipath selection, not next-hop modification.
Go deeper
Related to this question
Learn chapter
OSPF Neighbor Adjacency and Basics
Key term
BGP Route Reflector
A BGP Route Reflector is a networking device that reduces the number of BGP peer connections needed in a large network by allowing routers to share routing information without needing to connect to every other router directly.
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JA
Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
This 300-410 practice question is part of Courseiva's free Cisco certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the 300-410 exam.