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300-410 Practice Question: Is troubleshooting PBR on a Cisco router where…
A network engineer is troubleshooting PBR on a Cisco router where traffic from source 10.1.2.0/24 should be forwarded to next-hop 192.168.1.2. The route map 'PBR-TEST' is configured with 'match ip address 101' and 'set ip next-hop 192.168.1.2'. The engineer applies the route map to interface GigabitEthernet0/0. The engineer notices that PBR works for most traffic, but traffic from a specific host (10.1.2.100) is not being policy-routed. The engineer checks the ACL 101 and confirms it includes 10.1.2.0/24. 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 router is using CEF switching, and PBR is not applied to CEF-switched traffic without the 'ip route-cache policy' command.
If PBR is working for most traffic but not for a specific host, it could be due to the route map being applied to a subinterface while the host traffic arrives on a different subinterface, or the host traffic is being fast-switched and bypassing PBR. However, a common cause is that the host's traffic is being processed by CEF and the 'ip policy route-map' command does not affect CEF-switched packets unless 'ip route-cache policy' is enabled. In modern IOS, PBR by default only applies to process-switched packets unless 'ip route-cache policy' is configured.
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 router is using CEF switching, and PBR is not applied to CEF-switched traffic without the 'ip route-cache policy' command.
Why this is correct
Correct because by default, PBR only affects process-switched packets; CEF-switched packets ignore PBR unless 'ip route-cache policy' is enabled.
- ✗
The host 10.1.2.100 is sending traffic with a different source IP than expected.
Why it's wrong here
Incorrect because the ACL matches the subnet, so any host in that subnet should be matched; the symptom is specific to one host, but the ACL is correct.
- ✗
The 'set ip next-hop' command requires the next-hop to be directly connected, and 192.168.1.2 is not reachable.
Why it's wrong here
Incorrect because if the next-hop were unreachable, PBR would fall back to routing table for all traffic, not just one host.
- ✗
The route map is missing a 'sequence 10' statement; PBR requires explicit sequence numbers.
Why it's wrong here
Incorrect because route maps can have implicit sequence numbers; missing explicit numbers do not cause selective failure.
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Last reviewed: Jun 18, 2026
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