What typically drives the need for an aggregation layer in modern networks?
A. insufficient fiber cabling, especially between buildings
B. lack of high speed uplink capabilities at the access layer
C. simplification of spanning tree protocol ad the access layer
D. need to extend VLANs across wider areas
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Aggregation layer offers some benefits, which include “simplifying” network topology cabling. However, spanning-tree (STP) is a logical technology, which is simplified using VSF (Aruba OS) or VSX (Aruba OS-CX). An access switch can have multiple uplinks, but unless there is a LAG and virtualization at the AG layer, SPT only select one of the uplinks.
Agg layer helps if cabling is limited, and remote closet can bundle links from multiple closets. Fro example, a large campus with 20 closet, may have an AGG that backhauls traffic to core switch across the campus over couple of fibers