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300-410 Practice Question: Is troubleshooting a PBR (Policy-Based Routing)…
A network engineer is troubleshooting a PBR (Policy-Based Routing) issue on router R5. The engineer configured a route-map to set the next-hop for traffic from a specific source subnet. The route-map is applied to the incoming interface, but traffic from the source subnet is still being forwarded using the regular routing table. The engineer verifies that the ACL matches the traffic correctly. What is the most likely cause?
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-map is missing a 'set ip next-hop' command, or the next-hop is not reachable.
PBR route-maps must have at least one 'match' and one 'set' statement. If the route-map has a 'match ip address' but no 'set ip next-hop' (or the next-hop is unreachable), PBR will not apply and traffic will use the routing table. Also, the route-map must be applied to the correct interface and direction.
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-map is missing a 'set ip next-hop' command, or the next-hop is not reachable.
Why this is correct
Correct because without a valid 'set' command, PBR does not alter forwarding.
- ✗
The route-map is applied outbound instead of inbound on the interface.
Why it's wrong here
Incorrect because PBR is applied inbound on the interface where traffic arrives.
- ✗
The ACL is using a standard ACL, which cannot match source subnet correctly.
Why it's wrong here
Incorrect because standard ACLs can match source subnet with proper wildcard mask.
- ✗
The route-map has a 'set default interface' command that overrides the next-hop.
Why it's wrong here
Incorrect because 'set default interface' is used for default routes, not for PBR next-hop.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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