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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 ipv4 unicast 10.1.1.0/24
BGP routing table entry for 10.1.1.0/24, version 10 Paths: (1 available, best #1, table default) Advertised to update-groups: 1 Refresh Epoch 1 Local
10.1.1.2 from 10.1.1.2 (10.1.1.2)
Origin IGP, metric 0, localpref 100, valid, external, best Last update: Mon Mar 1 00:05:23 2024
What does this output indicate?
⚠ Common exam trap
Cisco often tests the misconception that any CoPP configuration automatically disrupts BGP, but the trap here is that a healthy BGP table entry with current timestamps proves CoPP is not dropping BGP packets, even if CoPP is configured.
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 functioning correctly, and CoPP is not interfering with BGP sessions.
The output shows a valid BGP route for 10.1.1.0/24 with the path marked as 'valid, external, best' and a recent last update time. This indicates that the BGP session is established, updates are being received, and the route is being installed in the routing table. Since CoPP drops packets only when control plane traffic exceeds configured rate limits, the presence of a healthy BGP route with current timestamps confirms that CoPP is not interfering with BGP sessions.
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 updates due to CoPP dropping packets.
Why it's wrong here
The route is present and valid, so updates are being received.
- ✓
BGP is functioning correctly, and CoPP is not interfering with BGP sessions.
Why this is correct
The route is learned from 10.1.1.2 and is best, indicating BGP is working.
- ✗
BGP is stuck in idle state due to CoPP.
Why it's wrong here
The route is valid and external, so the session is established.
- ✗
BGP is only advertising routes locally.
Why it's wrong here
The path is from 10.1.1.2, which is an external neighbor.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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