300-420 Question 113
Single answerA company has deployed a multi-area OSPF network to ensure scalability and fast convergence. Recently, the network team noticed an issue where convergence times between areas have increased significantly. After investigating, they suspect that an improper configuration of summarization is contributing to the delay. Which action should the team take to improve OSPF convergence in this scenario?
- A
Configure proper summarization at the ABRs to reduce the size of the routing tables.
- B
Increase the OSPF hello interval to reduce communication overhead between routers.
- C
Enable OSPF LSA throttling to minimize the propagation delay of topology changes.
- D
Disable OSPF summarization completely to ensure all routes are advertised in detail.
Show answer and explanation
Correct answer: A
Explanation
OSPF convergence can be impacted by how topology changes propagate between areas. Proper summarization at the ABRs reduces the number of LSAs shared between areas, shrinking the routing tables and limiting the impact of topology changes. This approach ensures that convergence remains fast and the network scales effectively.
- A. Correct.
Proper summarization at the ABRs reduces the size of routing tables by advertising only summary routes, which can improve convergence times by minimizing the scope of topology changes between areas.
- B. Incorrect.
Increasing the OSPF hello interval reduces communication overhead but can delay the detection of link or node failures, negatively impacting convergence times.
- C. Incorrect.
While OSPF LSA throttling can help with reducing the frequency of updates, it is not directly related to resolving convergence delays caused by improper summarization.
- D. Incorrect.
Disabling OSPF summarization entirely increases the number of routes shared across areas, potentially leading to larger routing tables and slower convergence.