- A
The BGP process is not configured to send traps to the SNMP agent; the command 'snmp-server enable traps bgp' is insufficient on some IOS versions without also enabling 'bgp snmp trap' under the BGP router configuration.
In some IOS versions, the SNMP agent needs explicit BGP notification enablement via 'bgp snmp trap' under the BGP router config. Without it, no BGP traps are generated.
- B
The NMS is using SNMPv3 but the router is configured for v2c, causing trap rejection.
Why wrong: The trap host is configured for v2c, and the NMS can poll, so version mismatch is not the issue. Traps would be sent regardless of polling.
- C
An ACL on the NMS is blocking UDP port 162 from the router.
Why wrong: This would cause traps to be sent but not received, but show snmp statistics shows TrapsSent: 0, meaning no traps are being generated.
- D
The router's SNMP trap queue is full, causing traps to be dropped.
Why wrong: show snmp pending shows no pending traps, so the queue is not full.
BGP Traps Not Sent: Missing BGP SNMP Trap Configuration
This 300-410 practice question tests your understanding of snmp troubleshooting. Examine the command output carefully: the correct answer depends on what the output actually shows, not on general recall alone. After answering, compare your reasoning against the explanation and wrong-answer breakdown below. Once you have made your selection, read the full explanation to reinforce the concept and understand why each distractor is designed to mislead on exam day.
A network engineer configures SNMP traps on router R3 to monitor BGP events. R3 is an iBGP route reflector with multiple clients. The configuration includes: snmp-server enable traps bgp, snmp-server host 192.168.1.100 version 2c public. However, the NMS receives no BGP traps. R3's show snmp pending shows no pending traps. show snmp statistics shows TrapsSent: 0. The NMS can poll R3 successfully via SNMP. What is the root cause?
Quick Answer
The answer is that the BGP process itself must be explicitly configured to send notifications to the SNMP agent, as the global `snmp-server enable traps bgp` command alone is insufficient on many IOS versions. This is because BGP traps require a two-part activation: the SNMP agent must be told to listen for BGP events, and the BGP process must be told to generate those events via the `bgp snmp trap` command under the BGP router configuration mode. Without this, the BGP process never sends trap data to the SNMP agent, resulting in zero traps sent even though SNMP polling works fine. On the Cisco CCNP ENARSI 300-410 exam, this scenario tests your understanding of the separation between SNMP agent configuration and protocol-specific notification generation—a common pitfall where engineers assume the global trap enable covers all sub-protocols. Remember the memory tip: "Global enables the listener, BGP enables the speaker."
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 BGP process is not configured to send traps to the SNMP agent; the command 'snmp-server enable traps bgp' is insufficient on some IOS versions without also enabling 'bgp snmp trap' under the BGP router configuration.
Option A is correct because on many Cisco IOS versions, the command `snmp-server enable traps bgp` only enables the SNMP agent to send BGP traps, but the BGP process itself must be explicitly configured to generate those traps using the `bgp snmp trap` command under the BGP router configuration. Without this, the BGP process never sends trap notifications to the SNMP agent, resulting in zero traps sent despite the SNMP trap configuration being otherwise correct.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
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 BGP process is not configured to send traps to the SNMP agent; the command 'snmp-server enable traps bgp' is insufficient on some IOS versions without also enabling 'bgp snmp trap' under the BGP router configuration.
- ✗
The NMS is using SNMPv3 but the router is configured for v2c, causing trap rejection.
Why it's wrong here
The trap host is configured for v2c, and the NMS can poll, so version mismatch is not the issue. Traps would be sent regardless of polling.
- ✗
An ACL on the NMS is blocking UDP port 162 from the router.
Why it's wrong here
This would cause traps to be sent but not received, but show snmp statistics shows TrapsSent: 0, meaning no traps are being generated.
- ✗
The router's SNMP trap queue is full, causing traps to be dropped.
Why it's wrong here
show snmp pending shows no pending traps, so the queue is not full.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Cisco often tests the misconception that `snmp-server enable traps bgp` alone is sufficient, when in fact the BGP process requires the additional `bgp snmp trap` command to generate the trap events.
Trap categories for this question
Command / output trap
This would cause traps to be sent but not received, but show snmp statistics shows TrapsSent: 0, meaning no traps are being generated.
Detailed technical explanation
How to think about this question
The `snmp-server enable traps bgp` command enables the SNMP agent to accept BGP trap notifications, but the BGP routing process must be configured to generate those notifications via `bgp snmp trap` under `router bgp`. This two-step requirement exists because BGP traps are event-driven from the BGP process, not the SNMP agent; without the BGP subcommand, the BGP process never sends trap signals to the SNMP agent. In real-world scenarios, engineers often miss this second command when upgrading from older IOS versions where the BGP process automatically sent traps, leading to silent trap failures.
KKey Concepts to Remember
- Read the scenario before looking for a memorised answer.
- Find the constraint that changes the correct option.
- Eliminate answers that are true in general but not in this case.
TExam Day Tips
- Watch for words such as best, first, most likely and least administrative effort.
- Review why wrong options are wrong, not only why the correct option is correct.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
How this comes up in practice
A security administrator must allow nursing staff to reach a patient records server while blocking access from the guest Wi-Fi VLAN. After applying an extended ACL, traffic is still blocked from nursing workstations. The ACL was applied outbound instead of inbound on the wrong interface. Questions like this test ACL direction and placement rules.
What to study next
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FAQ
Questions learners often ask
What does this 300-410 question test?
SNMP Troubleshooting — This question tests SNMP Troubleshooting — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: The BGP process is not configured to send traps to the SNMP agent; the command 'snmp-server enable traps bgp' is insufficient on some IOS versions without also enabling 'bgp snmp trap' under the BGP router configuration. — Option A is correct because on many Cisco IOS versions, the command `snmp-server enable traps bgp` only enables the SNMP agent to send BGP traps, but the BGP process itself must be explicitly configured to generate those traps using the `bgp snmp trap` command under the BGP router configuration. Without this, the BGP process never sends trap notifications to the SNMP agent, resulting in zero traps sent despite the SNMP trap configuration being otherwise correct.
What should I do if I get this 300-410 question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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Last reviewed: Jul 4, 2026
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