The design should summarize routes from the distribution layer toward the core and configure access-layer switches as EIGRP stubs. EIGRP query scope is a major design consideration in large routed campus networks. When a route is lost, EIGRP may send queries to neighbors to find an alternate path. If the network is not bounded properly, these queries can spread widely, slow convergence, and create stuck-in-active risk.
Configuring the access layer as EIGRP stub tells upstream routers that the access device is not a transit path to other networks, so unnecessary queries are not sent into the access layer. Summarizing at the distribution layer toward the core hides access-link instability and provides a smaller, more stable routing table to the rest of the network. Summarizing at the access layer is usually less useful when many VLANs are aggregated at distribution. Configuring the core as stub is inappropriate because the core should provide transit. Reference topics: EIGRP stub, route summarization, query boundary, campus hierarchy, DUAL convergence.