300-440 Question 287
Select 3A network administrator is troubleshooting NetFlow on a Cisco router configured with Flexible NetFlow. The administrator notices that no flow records are being exported to the collector. After verifying the configuration, they suspect an issue with the export process. Which of the following could be the cause of the problem?
- A
The flow exporter is configured with the wrong destination IP address.
- B
The flow monitor is not applied to any interface.
- C
The router does not have sufficient CPU resources to process NetFlow data.
- D
The version of NetFlow being used is not supported by the collector.
- E
The flow monitor is incorrectly configured with an invalid flow record.
Show answer and explanation
Correct answers: A, B, D
Explanation
When troubleshooting NetFlow export issues, ensure that the flow exporter is configured with the correct destination IP of the collector, the flow monitor is applied to an interface, and the collector supports the NetFlow version in use. Each of these is critical for the successful export and collection of flow records.
- A. Correct.
The flow exporter must be configured with the correct destination IP address of the NetFlow collector. If this is incorrect, flow records will not reach the collector.
- B. Correct.
The flow monitor must be applied to at least one interface to capture and export flow data. Without this, no data will be monitored or exported.
- C. Incorrect.
While high CPU usage can impact performance, it typically does not prevent the export of flow records unless the router is severely overloaded. This is less likely to be the primary cause in this scenario.
- D. Correct.
If the NetFlow version being used (e.g., v5, v9, or Flexible NetFlow) is not supported by the collector, flow records will not be processed correctly, leading to export failures.
- E. Incorrect.
An invalid flow record configuration would prevent the flow data from being collected properly, but the question specifically points to an issue with the export process, not the configuration of the flow record.