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300-410 Practice Question: Runs the following command to troubleshoot a…
A network engineer runs the following command to troubleshoot a Control Plane Policing (CoPP) issue:
R1# show bgp neighbors 10.1.1.2 received-routes
BGP table version is 10, local router ID is 10.1.1.1 Status codes: s suppressed, d damped, h history, * valid, > best, i - internal, r RIB-failure, S stale, m multipath, b backup-path, f RT-Filter, x best-external, a additional-path, c RIB-compressed, Origin codes: i - IGP, e - EGP, ? - incomplete
Network Next Hop Metric LocPrf Weight Path *> 10.3.3.0/24 10.1.1.2 0 100 0 i
Total number of prefixes 1
What does this output indicate?
⚠ Common exam trap
Cisco often tests the distinction between CoPP dropping packets before they reach the BGP process (which would show no received routes) versus BGP receiving routes but not installing them due to other reasons like RIB-failure or policy, leading candidates to incorrectly assume CoPP affects route installation.
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
✓
BGP is receiving routes correctly, and CoPP is not interfering with inbound updates.
The output shows a single BGP prefix (10.3.3.0/24) received from neighbor 10.1.1.2, with the route marked as valid (*) and best (>). This confirms that BGP is successfully receiving and processing the update, and the route is eligible for installation in the routing table. Since the route appears in the received-routes output, CoPP is not dropping the inbound BGP update packets, as CoPP would prevent the packets from reaching the BGP process entirely.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
BGP is not receiving any routes due to CoPP dropping updates.
Why it's wrong here
The output shows one prefix marked valid and best, so updates are arriving; CoPP dropping updates would leave the received-routes table empty or stale. It tempts because CoPP does police BGP TCP/179, but that would be the diagnosis only when no prefixes appear at all.
- ✓
BGP is receiving routes correctly, and CoPP is not interfering with inbound updates.
Why this is correct
The received-routes table shows one valid, best-path prefix from 10.1.1.2, proving inbound BGP updates arrive intact. Because CoPP polices punted control-plane traffic, a policer dropping BGP packets would leave this table empty or stale, so the populated output confirms no interference.
- ✗
BGP is receiving routes but not installing them in the routing table due to CoPP.
Why it's wrong here
The prefix carries the > and * valid-best codes, meaning it was installed in the BGP table and passed to the RIB; a RIB-failure would show the r code instead. CoPP causing non-installation is correct only when routes appear with r or are missing from the routing table.
- ✗
BGP session is flapping due to CoPP.
Why it's wrong here
A flapping session would show the neighbour in Idle/Active or repeatedly reset, and received-routes would list nothing or reset counters; here the session is Established and passing one prefix. Flapping is the right conclusion only when neighbour state or uptime changes repeatedly.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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