While summarization can be beneficial for reducing the size of the routing table, it's not always necessary to perform manual summarization on all interfaces. Summarization should be done strategically based on the network topology and addressing plan. Preventing unnecessary EIGRP neighborships on switch virtual interfaces is a key design consideration for a more efficient and scalable configuration in a Data Center environment because In a Data Center environment, switch virtual interfaces (SVIs) are often used for VLAN routing. Forming EIGRP neighborships across all SVIs may lead to unnecessary overhead and increased complexity in the network.