300-410 Question 281
Select 3A network engineer is troubleshooting a network performance issue in a branch office. The engineer has configured an IP SLA operation to measure end-to-end delay and jitter between the branch office router and a central data center router. Despite the configuration, the engineer notices that the IP SLA statistics show no data. Which of the following steps should the engineer take to resolve the issue?
- A
Verify that the IP SLA operation is scheduled to run and not in a stopped state.
- B
Ensure that the source and destination devices are reachable via ICMP.
- C
Check if an IP SLA responder is configured on the central data center router.
- D
Verify that the IP SLA operation is associated with an active tracking object.
- E
Confirm that a valid VRF context is applied to the IP SLA operation if VRFs are in use.
Show answer and explanation
Correct answers: A, C, E
Explanation
IP SLA operations require specific configurations to function correctly. The operation must be scheduled to run, and certain operations like jitter or delay may require an IP SLA responder on the destination device. Additionally, in environments where VRFs are used, the correct VRF context must be applied to the IP SLA operation. These steps ensure that the SLA statistics are collected and displayed properly.
- A. Correct.
An IP SLA operation must be scheduled to run, or it will not collect any data. If it is in a stopped state, no performance metrics will be generated.
- B. Incorrect.
While ICMP reachability is important for basic connectivity, IP SLA operations such as jitter and delay often use UDP-based probes, not ICMP. This option is incorrect in this context.
- C. Correct.
For specific IP SLA operations (such as jitter and delay), an IP SLA responder may need to be configured on the destination device to reply to the probes correctly.
- D. Incorrect.
Although tracking objects are useful for dynamic failover or route tracking, they are not directly required for IP SLA data collection. This option is incorrect.
- E. Correct.
If the devices are using VRF (Virtual Routing and Forwarding), the IP SLA operation must be associated with the correct VRF context to function properly.