300-420 Question 15
Select 3You are designing an EIGRP routing solution for a multi-site enterprise network. The network includes multiple branches connected to two main data centers over MPLS. The design must ensure stable routing, quick convergence in case of link failure, and scalability as new branches are added. Which design considerations should you include to meet these requirements?
- A
Configure EIGRP stub routing on branch routers to limit the propagation of unnecessary routes.
- B
Use EIGRP variance to enable unequal-cost load balancing across MPLS links.
- C
Adjust EIGRP hello and hold timers globally to reduce convergence time.
- D
Implement route summarization at branch routers to reduce the size of the routing table.
- E
Enable EIGRP authentication to secure routing updates between all routers.
Show answer and explanation
Correct answers: A, D, E
Explanation
To create a stable, secure, and scalable EIGRP routing design, it is important to limit unnecessary route propagation (EIGRP stub routing), reduce routing table size (route summarization), and secure routing updates (EIGRP authentication). These measures enhance scalability, improve network stability, and provide security. Unequal-cost load balancing and globally reducing timers are less suitable as they can introduce complexity and instability in a multi-site MPLS deployment.
- A. Correct.
Configuring EIGRP stub routing on branch routers limits the routes advertised by branches, reducing unnecessary routing information and improving stability and scalability.
- B. Incorrect.
Using EIGRP variance for unequal-cost load balancing is not recommended in this scenario, as it can lead to suboptimal routing and increase complexity in a multi-site MPLS network.
- C. Incorrect.
Adjusting EIGRP hello and hold timers globally can reduce convergence time but may lead to instability across diverse WAN links with varying latencies.
- D. Correct.
Implementing route summarization reduces the size of routing tables and improves scalability by limiting the propagation of specific routes.
- E. Correct.
Enabling EIGRP authentication secures routing updates, ensuring that only legitimate routers participate in EIGRP routing, which is crucial for stability and security.